From RGB to CMYK

"Smurk" wrote in message

Hi
Until now I have been working with a printer company that prints my photos on photo paper. Now I have to work with a new printer services to print

on

other mediums like tiles and they are opeating in CMYK.
I am lost. I don’t understand why do I lose my colors when moving from

RGB

to CMYK

Because RGB and CMYK have different gamuts. The truth is almost every printer is a CMYK printer, or a variant of the same, with the exception of certain high-end photo imaging devices which use RGB lasers [such as your mini-lab] to expose photographic papers. OTOH, if it uses paint, ink, or dye, it’s a CMYK printer. (This is equally true for all inkjets as well; though their drivers are set up to receive RGB files, they convert to a variant of CMYK – think about it, does your printer at home have Red, Blue, and Green inks?)

and if this is really needed, what is the reality of it?

What choice do you have? They can’t "expose" your tile with a laser, rather they have to spray paint on it. That is the "reality."

How do I do that without trashing my work?

Convert the image(s) to a CMYK profile (if they have one) and tweak the colors as best you can. If you need a certain color that is outside their CMYK gamut, you can call for spot colors. That is why you have Photoshop. Others of us have been doing this for a long time, and the results can be excellent – it is not magic. All the beautiful art posters you see everyday? They are almost exclusively CMYK output.

BTW my camera in in RGB as well as all my clients and people I work with?

All true, but so what? If you have to go to CMYK output, that’s what you have to do. Buckle up.

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"you can call for spot colors." Could you define or provide more details about this sugestion?
Also is it just selecting CMYK in PS, I have PS 7, and it does the translation? I did that already and I don’t seem to see very much differences, if any. However at the printing place, when they did translate my photos from RGB to CMYK the red became very bluish and the yellow more like orange.. In some aspects it was really weird. How can I prepare my documents to avoid that? I have PS 7 on a PC with 4 GB ram and 4.2Ghz speed and full of disk space..
The person at the print service is sugesting that I use masks but she could not explain what it is or how to use it?
Sorry for being so ‘dummy’..
Thank you for your post..
Yves

"Flycaster" wrote in message

"Smurk" wrote in message

Hi
Until now I have been working with a printer company that prints my

photos

on photo paper. Now I have to work with a new printer services to print

on

other mediums like tiles and they are opeating in CMYK.
I am lost. I don’t understand why do I lose my colors when moving from

RGB

to CMYK

Because RGB and CMYK have different gamuts. The truth is almost every printer is a CMYK printer, or a variant of the same, with the exception of certain high-end photo imaging devices which use RGB lasers [such as your mini-lab] to expose photographic papers. OTOH, if it uses paint, ink, or dye, it’s a CMYK printer. (This is equally true for all inkjets as well; though their drivers are set up to receive RGB files, they convert to a variant of CMYK – think about it, does your printer at home have Red,

Blue,

and Green inks?)

and if this is really needed, what is the reality of it?

What choice do you have? They can’t "expose" your tile with a laser,

rather

they have to spray paint on it. That is the "reality."

How do I do that without trashing my work?

Convert the image(s) to a CMYK profile (if they have one) and tweak the colors as best you can. If you need a certain color that is outside their CMYK gamut, you can call for spot colors. That is why you have Photoshop. Others of us have been doing this for a long time, and the results can be excellent – it is not magic. All the beautiful art posters you see everyday? They are almost exclusively CMYK output.

BTW my camera in in RGB as well as all my clients and people I work

with?

All true, but so what? If you have to go to CMYK output, that’s what you have to do. Buckle up.

—–= Posted via Newsfeeds.Com, Uncensored Usenet News =—– http://www.newsfeeds.com – The #1 Newsgroup Service in the World! —–== Over 100,000 Newsgroups – 19 Different Servers! =—–

Smurk wrote:

Hi
Until now I have been working with a printer company that prints my photos on photo paper. Now I have to work with a new printer services to print on other mediums like tiles and they are opeating in CMYK.
I am lost. I don’t understand why do I lose my colors when moving from RGB to CMYK and if this is really needed, what is the reality of it?
How do I do that without trashing my work?
BTW my camera in in RGB as well as all my clients and people I work with? I really need help here..
Thank you very much in advance.

With luck, the printer may provide you with the same profile that they used to convert to CMYK. With tiles, if they are using fired glazes, the colors may be very different from your Photoshop CMYK setup, and that would explain the strange colors you are seeing.

In general, I would not worry overmuch about trashing your work. Here’s an article discussing some of the issues with color purity, etc http://geigy.2y.net/DigPhoto/CMYK-RGB/CMYK-RGB.htm

CMYK is, after all, the eventual destination of most of the photographs that make money, and being a Photoshop devotee I think it’s appropriate for photographers to have more direct control over the final result.

Doing your own CMYK seps is a big step in that direction, and in the digital world it’s not nearly as big a jump as it once was.

To get a leg up on printing technology and procedures, I recommend two books. One is the Pocket Pal – a relatively inexpensive handbook put out by international paper. It is full of printer terminology and descriptions, sorted alphabetically. www.ippocketpal.com/

The other is to buy a copy of any book by Dan Margulis – the latest is called Professional Photoshop but earlier editions will be useful as well. He covers color issues in great detail, and much of it is targetted squarely at CMYK printing
http://www.ledet.com/margulis/articles.html

Back to your tile printer. If no profile exists for the glazes, you may be able to get the "ink" colors and type them into Photoshop’s custom inks setup – or make an educated guess and get reasonably close to what you need. I would not worry about this right away – first see how the printer is doing the conversion.

I have taken the liberty of cross posting this response to the prepress group – some of them may have some more direct experience. —

Mike Russell
http://www.curvemeister.com
http://www.zocalo.net/~mgr
http://geigy.2y.net

Thank you very much Mike for that very instructive post. I feel more hopeful that the issue will be resolved if I can make sense of these aspects of photography.
I will get these books asap.
Thanks again
Yves

"Mike Russell" wrote in message

Smurk wrote:

Hi
Until now I have been working with a printer company that prints my photos on photo paper. Now I have to work with a new printer services to print on other mediums like tiles and they are opeating in CMYK.
I am lost. I don’t understand why do I lose my colors when moving from RGB to CMYK and if this is really needed, what is the reality of it?
How do I do that without trashing my work?
BTW my camera in in RGB as well as all my clients and people I work with? I really need help here..
Thank you very much in advance.

With luck, the printer may provide you with the same profile that they

used

to convert to CMYK. With tiles, if they are using fired glazes, the

colors

may be very different from your Photoshop CMYK setup, and that would

explain

the strange colors you are seeing.

In general, I would not worry overmuch about trashing your work. Here’s

an

article discussing some of the issues with color purity, etc http://geigy.2y.net/DigPhoto/CMYK-RGB/CMYK-RGB.htm

CMYK is, after all, the eventual destination of most of the photographs

that

make money, and being a Photoshop devotee I think it’s appropriate for photographers to have more direct control over the final result.
Doing your own CMYK seps is a big step in that direction, and in the

digital

world it’s not nearly as big a jump as it once was.

To get a leg up on printing technology and procedures, I recommend two books. One is the Pocket Pal – a relatively inexpensive handbook put out

by

international paper. It is full of printer terminology and descriptions, sorted alphabetically. www.ippocketpal.com/

The other is to buy a copy of any book by Dan Margulis – the latest is called Professional Photoshop but earlier editions will be useful as well. He covers color issues in great detail, and much of it is targetted

squarely

at CMYK printing
http://www.ledet.com/margulis/articles.html

Back to your tile printer. If no profile exists for the glazes, you may

be

able to get the "ink" colors and type them into Photoshop’s custom inks setup – or make an educated guess and get reasonably close to what you

need.

I would not worry about this right away – first see how the printer is

doing

the conversion.

I have taken the liberty of cross posting this response to the prepress group – some of them may have some more direct experience. —

Mike Russell
http://www.curvemeister.com
http://www.zocalo.net/~mgr
http://geigy.2y.net

Hexachrome printing extends the gamut a bit, plus some printers have 6 colours, some even 12 for large format printing.

Most of the time CMYK will be all you need. Most regular people don’t get into "touch plates" – spot colours to boost a certain hue. Not recommended for beginners.

Just make sure you are using the entire CMYK gamut after converting from RGB.

JD

Because RGB and CMYK have different gamuts. The truth is almost every

printer is a CMYK printer, or a variant of the same, with the exception of certain high-end photo imaging devices which use RGB lasers [such as your mini-lab] to expose photographic papers. OTOH, if it uses paint, ink, or dye, it’s a CMYK printer. (This is equally true for all inkjets as well; though their drivers are set up to receive RGB files, they convert to a variant of CMYK – think about it, does your printer at home have Red,

Blue,

and Green inks?)

"Smurk" wrote in message

"you can call for spot colors." Could you define or provide more details about this sugestion?

I’m not sure it will apply in your case (applying color glazes to tiles) but what it involves is making a separate plate with a selected color on it so that you can make a color(s) that the other 4 plates (CMYK) together cannot make. This can $$$ to your costs.

Also is it just selecting CMYK in PS, I have PS 7, and it does the translation?

Yes. But there are individual CMYK color spaces that match a specific printer, ink and paper combination. IF the printer can give you that information in the form of a "profile" then you can convert the file to that space and get very, very accurate color matching between what you see on your screen and what comes out their printer.

I did that already and I don’t seem to see very much
differences, if any.

There generally isn’t. It’s only when you have really saturated colors that you’ll get noticeable clipping.

However at the printing place, when they did translate
my photos from RGB to CMYK the red became very bluish and the yellow more like orange.

They did the conversion? Well, if they screwed it up that bad, I don’t think I’d use them again! That’s pathetic.

In some aspects it was really weird. How can I prepare my documents to avoid that?

Make sure your monitor is properly calibrated and profiled, and use a printer profile. Frankly, it sounds like you might want to find a different printing place.

I have PS 7 on a PC with 4 GB ram and 4.2Ghz speed

and full of disk space.

Umm, you sure about that?

The person at the print service is sugesting that I use masks but she

could

not explain what it is or how to use it?

I don’t have a clue what she means by that, and if she can’t explain it to you, then neither does she. Ask to see your file on their screen, and see if it matches their print. If it matches, ask her if their monitor is calibrated and profiled. If it is, ask her for their printer profile, and if she can’t give you one, write down their CMYK settings and use those to build a mock profile so that you can soft-proof their color space.

Sorry for being so ‘dummy’..

Nothing wrong with asking questions. Tell you what: if all of this stuff is "over your head", then do yourself a favor. Find another printer, show him your file (and give him a print to match) and say, "This is what I want on that tile." Keep looking until you find a printer that says, "No problem. How many do you want?"

—–= Posted via Newsfeeds.Com, Uncensored Usenet News =—– http://www.newsfeeds.com – The #1 Newsgroup Service in the World! —–== Over 100,000 Newsgroups – 19 Different Servers! =—–

Hi
Until now I have been working with a printer company that prints my photos on photo paper. Now I have to work with a new printer services to print on other mediums like tiles and they are opeating in CMYK.
I am lost. I don’t understand why do I lose my colors when moving from RGB to CMYK and if this is really needed, what is the reality of it? How do I do that without trashing my work?
BTW my camera in in RGB as well as all my clients and people I work with? I really need help here..
Thank you very much in advance.
Yves

==============================
Since they are ink, your prints have ALWAYS been CMYK. RGB exists only on CRT’s (TV’s and computer monitor). The gamut of CMYK is less than that of RGB, so colors that you see in RGB will often be muted when printed. For this reason, a somewhat intricate process know as "color correct" must be done if you wish print output to reflect the pre-desired colors, and if you wish to retain the same relative differences in color intensities and values throughout. Actually, the CMYK conversion in Photoshop is only a virtual approximation, as you’ll still see the results on your monitor in RGB.

In article <i3bzb.64390$>,
"Mike Russell" wrote:

Back to your tile printer. If no profile exists for the glazes, you may be able to get the "ink" colors and type them into Photoshop’s custom inks setup – or make an educated guess and get reasonably close to what you need. I would not worry about this right away – first see how the printer is doing the conversion.

Beware the Photoshop "custom profile" – you don’t get the results that you expect…

http://prometheus.idea-digital.com/phpbb2/viewtopic.php?t=73

You’ll need to register at the site to read this article. If you’d like to see other stuff before signing up, go here first:

http://prometheus.idea-digital.com/phpbb2/index.php

Regards

—
Martin

In article <i3bzb.64390$>,
"Mike Russell" wrote:

Back to your tile printer. If no profile exists for the glazes, you may be able to get the "ink" colors and type them into Photoshop’s custom inks setup – or make an educated guess and get reasonably close to what you need. I would not worry about this right away – first see how the printer is doing the conversion.

Martin wrote:

Beware the Photoshop "custom profile" – you don’t get the results that you expect…

[invitation to register at web site snipped]

I disagree. For the purposes of the original posting, which was to get a better match for some very unusual inks, Photoshop’s custom inks setup is right on the money.

Most importantly, it’s included as part of Photoshop. It’s free in other words. Other profile editors are quite expensive.
—

Mike Russell
www.curvemeister.com
www.geigy.2y.net

"Mike Russell" wrote in
news:i3bzb.64390$:

Mike,
Thank you for an informative and very instructive post. I donwloaded your ICM and trying it out. So far, I’m impressed. I am going to have to revise my thinking.
RVW

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In article <TTtzb.65210$>,
"Mike Russell" wrote:

In article <i3bzb.64390$>,
"Mike Russell" wrote:

Back to your tile printer. If no profile exists for the glazes, you may be able to get the "ink" colors and type them into Photoshop’s custom inks setup – or make an educated guess and get reasonably close to what you need. I would not worry about this right away – first see how the printer is doing the conversion.

Martin wrote:

Beware the Photoshop "custom profile" – you don’t get the results that you expect…

[invitation to register at web site snipped]

I disagree. For the purposes of the original posting, which was to get a better match for some very unusual inks, Photoshop’s custom inks setup is right on the money.

Really?

Photoshop’s "custom profile" setup is a disaster area – and acknowledged to be so by people like Bruce Fraser, Dan Margulis et al. And should only be visited by people who have both time and money to burn on repetitive separation and proofing sessions.

Most importantly, it’s included as part of Photoshop. It’s free in other words. Other profile editors are quite expensive.

The fact that it is free is little compensation for the money that you’ll burn trying to get good separations from it. And nobody is suggesting that the OP waste money on the purchase of a profile editor – although perhaps *you* would benefit from using one on your own wide gamut CMYK profile? 😉

The best way to get a good result – as always – is to talk to the printer, show them some proofs and files, get their advice etc.

Leave Photoshop’s custom profiles to the brave and the foolhardy.

Regards

—
Martin

Martin wrote:
[re using PS’s custom inks setup to better match tile glaze colors]

Photoshop’s "custom profile" setup is a disaster area – and acknowledged to be so by people like Bruce Fraser, Dan Margulis et al. And should
only be visited by people who have both time and money to burn on repetitive separation and proofing sessions.

That’s silly, Martin. I don’t think you can find quotes from either of those people that will back you up. Sure, there are some problems with the PS custom CMYK editor, but these mainly involve default settings, and consistency across PS versions. The quality or accuracy of the final CMYK result is not really in question.

Most importantly, it’s included as part of Photoshop. It’s free in other words. Other profile editors are quite expensive.

The fact that it is free is little compensation for the money that you’ll burn trying to get good separations from it. And nobody is suggesting that the OP waste money on the purchase of a profile editor

Are you suggesting there’s a solution to the original question that does not involve changing the CMYK profile?

– although perhaps *you* would benefit from using one on your own wide
gamut CMYK profile? 😉

Absolutely. I’d enjoy playing with one of the better profile editing packages. They are pricey puppies. though.

The best way to get a good result – as always – is to talk to the printer, show them some proofs and files, get their advice etc.

Total agreement there.
—

Mike Russell
www.curvemeister.com
www.geigy.2y.net

In article <5HFzb.65495$>,
"Mike Russell" wrote:

Martin wrote:
[re using PS’s custom inks setup to better match tile glaze colors]

Photoshop’s "custom profile" setup is a disaster area – and acknowledged to be so by people like Bruce Fraser, Dan Margulis et al. And should
only be visited by people who have both time and money to burn on repetitive separation and proofing sessions.

That’s silly, Martin. I don’t think you can find quotes from either of those people that will back you up. Sure, there are some problems with the PS custom CMYK editor, but these mainly involve default settings, and consistency across PS versions. The quality or accuracy of the final CMYK result is not really in question.

Check this link and see who wrote this then:

http://lists.apple.com/mhonarc/colorsync-users/msg18877.html

"If the Euroscale profiles don’t work for you, fine, but they have absolutely no connection with any settings that appear in Custom CMYK (which I agree is unsafe at any speed…)"

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Dan’s views on Photoshop’s fudging of cyan generation are well known to anybody familiar with his writing.

I do question the quality of the CMYK from profiles generated by Photoshop’s custom CMYK dialog. And I question it for good reason – because I spend all day separating images in Photoshop and proofing the results.

As I posted earlier, my views and examples can be found here:

http://prometheus.idea-digital.com/phpbb2/viewtopic.php?t=73

Most importantly, it’s included as part of Photoshop. It’s free in other words. Other profile editors are quite expensive.

The fact that it is free is little compensation for the money that you’ll burn trying to get good separations from it. And nobody is suggesting that the OP waste money on the purchase of a profile editor

Are you suggesting there’s a solution to the original question that does not involve changing the CMYK profile?

Hopefully there is, because creating something from scratch in PS is going to take time and proofs.

– although perhaps *you* would benefit from using one on your own wide
gamut CMYK profile? 😉

Absolutely. I’d enjoy playing with one of the better profile editing packages. They are pricey puppies. though.

I can change the copyright info in your profile so that nobody will know that you created it in Photoshop if you like 🙂

The best way to get a good result – as always – is to talk to the printer, show them some proofs and files, get their advice etc.

Total agreement there.

Excellent. I wasn’t posting to start an argument over profiling methods. I just wanted to warn the OP that using Photoshop to create successful custom profiles is hard to do.

Regards

—
Martin

The esteemed Martin observed: (snipped
some):

As I posted earlier, my views and examples can be found here:
http://prometheus.idea-digital.com/phpbb2/viewtopic.php?t=73

OT:
Martin I hope you will forgive me for going OT but I thought you might want to know that your phpbb2 forum is not very secure.
I am by no means a "hacker" and know less than the average script kiddie but was able to get in without logging on in about 15 seconds and read this:

{Idea Weekly News — 1 December 2003
iPod’s Dirty Secret
A follow up to the controversy caused by the Niestat Brothers’ recent video. http://prometheus.idea-digital.com/phpbb2/viewtopic.php?t=55 }

If you check your server access logs you will see when I got in from my IP:
217.135.24.56
Which should be logged at 16.50ish GMT showing:
User-Agent: Mozilla/4.0 (compatible; MSIE 6.6; MegaPC; Webhamster cable madman)

There was nothing malicious in my intentions which were prompted purely by security concerns after friends and business associates recently had their fora and chat rooms hacked and in some cases defaced by Russian script kiddies. These kiddies *are* malicious and a lot more knowledgeable than me!

Best wishes,
—
Derek Tree

"Smurk" …

Hi
Until now I have been working with a printer company that prints my photos on photo paper. Now I have to work with a new printer services to print on other mediums like tiles and they are opeating in CMYK.
I am lost. I don’t understand why do I lose my colors when moving from RGB to CMYK and if this is really needed, what is the reality of it? How do I do that without trashing my work?
BTW my camera in in RGB as well as all my clients and people I work with? I really need help here..
Thank you very much in advance.
Yves

—
************************************************************ **************** ***********************************
You are welcome to visit my digital art gallery at http://www.ybdigitals.com or my digital photography gallery at http://www.pbase.com/yves For subscribing to our news or editorial
http://www.ybdigitals.com/subscription.htm
Then listen to Mark Twain who once advised; "blessed is the man, who having nothing to say, does not proceed to prove it."
This led us to consider that if "insanity is being defined as: "repeating the same behavior despite consistently obtaining the same undesirable results", then ‘no one ever won a medal for being in the audience. Which could relate to the second law of thermodynamics which can be summarized as "you can’t get something for nothing."
The world wouldn’t be
In such a snarl
If Marx had been Groucho
Instead of Karl.
Le temps n’attend personne. Rassemble chaque instant qu’il te reste et il sera de grande valeur.
Thank you.

hi smurk

01. First buy yourself a Process Color Guide (CMYK swatchbook). There are a lot of colors in it. If you cant find a color in this book,
it cant be reproduced on a CMYK printer with 4-color separation.

02. If your image is "simple" (color swatches), then you can "profile/convert" it manualy with your swatchbook.

03. By complicated (continuos tone) RGB-images you need a/ an RGB input profile
b/ a CMYK output profile
c/ a Color Managemnet System (Microsoft, lcms, Adobe)
to convert your image

04. The task is to find the nearest CMYK-color to your RGB-color.

05. Have a look at the newsgroup sci.color to see, how complicated it can be.
If you havent the background, you wont even understand what they are talking about.

i hope this has helped a little
joe

In article <H9l60gCLV4z$Ew+>,
Derek Tree wrote:

The esteemed Martin observed: (snipped
some):

As I posted earlier, my views and examples can be found here:
http://prometheus.idea-digital.com/phpbb2/viewtopic.php?t=73

OT:
Martin I hope you will forgive me for going OT but I thought you might want to know that your phpbb2 forum is not very secure.
I am by no means a "hacker" and know less than the average script kiddie but was able to get in without logging on in about 15 seconds and read this:

{Idea Weekly News — 1 December 2003
iPod’s Dirty Secret
A follow up to the controversy caused by the Niestat Brothers’ recent video. http://prometheus.idea-digital.com/phpbb2/viewtopic.php?t=55 }
If you check your server access logs you will see when I got in from my IP:
217.135.24.56
Which should be logged at 16.50ish GMT showing:
User-Agent: Mozilla/4.0 (compatible; MSIE 6.6; MegaPC; Webhamster cable madman)

There was nothing malicious in my intentions which were prompted purely by security concerns after friends and business associates recently had their fora and chat rooms hacked and in some cases defaced by Russian script kiddies. These kiddies *are* malicious and a lot more knowledgeable than me!

Derek, Derek, Derek…

The scripting in that forum is as secure as the wallet in my inside pocket should we ever meet for a drink!

The part of the site that you visited is open to anybody to browse (as I mentioned in my original post).

Some of our work, scripts we write, hints & tips etc are only available to those who sign up. We don’t charge for the information, but would prefer that people do us the courtesy of registering before reading all the really juicy bits 🙂

If you’d clicked any of the "Member Forums" or "What do we do?" sections you’d have found that you need to login to get access.

Until you take the plunge and sign up you can always visit more of the public area. This might give you a laugh:

http://prometheus.idea-digital.com/phpbb2/viewtopic.php?t=63

Regards

—
Martin

The esteemed Martin observed (some
snipped):

The scripting in that forum is as secure as the wallet in my inside pocket should we ever meet for a drink!

The part of the site that you visited is open to anybody to browse (as I mentioned in my original post).

I’m aware of that.

If you’d clicked any of the "Member Forums" or "What do we do?" sections you’d have found that you need to login to get access.

Have it your own way. Nevertheless I assure you that your login can be bypassed without much difficulty. But I am not about to post the vulnerability on a public newsgroup or the technique needed to exploit it.

The friends I mentioned (also running phpbb2) were just as complacent. Suffice to say they’re not so complacent now..

Best wishes,
—
Derek Tree

In article <af+dMuAlr6z$>,
Derek Tree wrote:

Have it your own way. Nevertheless I assure you that your login can be bypassed without much difficulty. But I am not about to post the vulnerability on a public newsgroup or the technique needed to exploit it.

The friends I mentioned (also running phpbb2) were just as complacent. Suffice to say they’re not so complacent now..

I’d obviously like to hear how the login can be bypassed. Join up at the site and send me a private message (or do it by stealth) – or just send me an email to martin at my top level domain name.

PHPBB has had a couple of security issues. The most serious (September 10th) was solved before I downloaded the software. There has been one more since (November 24th) but I’ve patched the script to solve this.

But I won’t be complacent. This stuff is new to me and is a lot of fun to play with – if you’ve got any tips I’d be glad to hear them.

Regards

—
Martin

"joe" wrote in message

"Smurk" wrote in message

news:<rJ9zb.17320$>…

Hi
Until now I have been working with a printer company that prints my

photos

on photo paper. Now I have to work with a new printer services to print

on

other mediums like tiles and they are opeating in CMYK.
I am lost. I don’t understand why do I lose my colors when moving from

RGB

to CMYK and if this is really needed, what is the reality of it? How do I do that without trashing my work?
BTW my camera in in RGB as well as all my clients and people I work

with?

I really need help here..
Thank you very much in advance.
Yves

—

************************************************************ ****************

***********************************
You are welcome to visit my digital art gallery at

http://www.ybdigitals.com

or my digital photography gallery at http://www.pbase.com/yves For subscribing to our news or editorial
http://www.ybdigitals.com/subscription.htm
Then listen to Mark Twain who once advised; "blessed is the man, who

having

nothing to say, does not proceed to prove it."
This led us to consider that if "insanity is being defined as:

"repeating

the same behavior despite consistently obtaining the same undesirable results", then ‘no one ever won a medal for being in the audience. Which could relate to the second law of thermodynamics which can be summarized

as

"you can’t get something for nothing."
The world wouldn’t be
In such a snarl
If Marx had been Groucho
Instead of Karl.
Le temps n’attend personne. Rassemble chaque instant qu’il te reste et il sera de grande valeur.
Thank you.

hi smurk

01. First buy yourself a Process Color Guide (CMYK swatchbook). There are a lot of colors in it. If you cant find a color in this book,
it cant be reproduced on a CMYK printer with 4-color separation.
02. If your image is "simple" (color swatches), then you can "profile/convert" it manualy with your swatchbook.
03. By complicated (continuos tone) RGB-images you need
a/ an RGB input profile
b/ a CMYK output profile
c/ a Color Managemnet System (Microsoft, lcms, Adobe)
to convert your image

04. The task is to find the nearest CMYK-color to your RGB-color.
05. Have a look at the newsgroup sci.color to see, how complicated it can be.
If you havent the background, you wont even understand what they are talking about.

Umm, given the lack of knowledge demonstrated by the poster, don’t you think he’d be better served by just finding a printer that knows what he is doing?

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