Red cast, color correction needed

Hi Sarah

Try Image -> Adjustments – Photo Filters…

There are other variables such as luminosity and density too

Arty

"Sarah Feliz" wrote in message

I have a few hi-res images scanned from transparencies that are overly red. These are transparencies of miniature paintings from a medieval manuscript.
I suspect the lighting was pretty bad when they took the transparencies–as
a result, in each scan, the whole image is overly red. I’ve already run levels, curves, color balance and, although much improved, the images are still way too red.

I do not have the optiono of rescanning and at this point I’m afraid of deteriorating the images by doing too much additional intervention.
Any suggestions on what else I can do to tone down the red?
Many thanks,
Sarah

Sarah Feliz wrote in
news:BD9838B6.8DF0%:

I have a few hi-res images scanned from transparencies that are overly red. These are transparencies of miniature paintings from a medieval manuscript. I suspect the lighting was pretty bad when they took the transparencies–as a result, in each scan, the whole image is overly red. I’ve already run levels, curves, color balance and, although much improved, the images are still way too red.

I do not have the optiono of rescanning and at this point I’m afraid of deteriorating the images by doing too much additional intervention.
Any suggestions on what else I can do to tone down the red?
Many thanks,
Sarah

In curves, set the drop down menu on red and then adjust.

If thats not enough go into the red channel and try adjusting from there.

—
Rule one; Question Everything except rule two

Rule two; Never Question the Wisdom of Rule One

Sarah Feliz wrote:

I have a few hi-res images scanned from transparencies that are overly red. These are transparencies of miniature paintings from a medieval manuscript. I suspect the lighting was pretty bad when they took the transparencies–as a result, in each scan, the whole image is overly red. I’ve already run levels, curves, color balance and, although much improved, the images are still way too red.
I do not have the optiono of rescanning and at this point I’m afraid of deteriorating the images by doing too much additional intervention.
Any suggestions on what else I can do to tone down the red?

Hi Sara,

This sort of thing is done all the time. Do not worry about damaging the image by color correcting it, but DO save your original scans in a safe place – I suggest writing them to CD.

Can you post a sample image – perhaps a section of one of the scans if there are copyright or other issues, and have some of us take a crack at it. Fixing your images may be a simple matter of placing a neutral in the right place.

The fact that the originals were overly red may mean that they took the images indoors with daylight film. Unfortunately, this may mean a very weak blue channel, and a loss of some detail in the very pure blue, Lapis Lazuli, portions of the image which can turn completely black in this situation. If you believe this is the case, you may want to try the Curvemeister curve for correcting this specific problem and see if it creates a marked improvement, then fine tune the curves to get closer to the result you want. You can always hand color Mary to look as everyone knows she should.

The curves are the second example in a tutorial located here: http://www.curvemeister.com/tutorials/what_ails_you/index.ht m —

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

Hi Mike

What you say about daylight film makes a lot of sense so I’m eager to test the curves on the website you recommended, but when I try to download the curve all I get is a new webpage with gibberish. I get the same result no matter which curve I try to download.

Is there something wrong with this website or am I doing something wrong? I’m working on a Mac — would that make a difference?

I have to send this job to the printers today but am hoping to be able to put these curvemeister curves to the test before I do so.

Thanks,
Sarah

On 10/18/04 12:45 AM, in article
DwKcd.31948$, "Mike Russell"
wrote:

Sarah Feliz wrote:

I have a few hi-res images scanned from transparencies that are overly red. These are transparencies of miniature paintings from a medieval manuscript. I suspect the lighting was pretty bad when they took the transparencies–as a result, in each scan, the whole image is overly red. I’ve already run levels, curves, color balance and, although much improved, the images are still way too red.
I do not have the optiono of rescanning and at this point I’m afraid of deteriorating the images by doing too much additional intervention.
Any suggestions on what else I can do to tone down the red?

Hi Sara,

This sort of thing is done all the time. Do not worry about damaging the image by color correcting it, but DO save your original scans in a safe place – I suggest writing them to CD.

Can you post a sample image – perhaps a section of one of the scans if there are copyright or other issues, and have some of us take a crack at it. Fixing your images may be a simple matter of placing a neutral in the right place.

The fact that the originals were overly red may mean that they took the images indoors with daylight film. Unfortunately, this may mean a very weak blue channel, and a loss of some detail in the very pure blue, Lapis Lazuli, portions of the image which can turn completely black in this situation. If you believe this is the case, you may want to try the Curvemeister curve for correcting this specific problem and see if it creates a marked improvement, then fine tune the curves to get closer to the result you want. You can always hand color Mary to look as everyone knows she should.
The curves are the second example in a tutorial located here: http://www.curvemeister.com/tutorials/what_ails_you/index.ht m

Sarah Feliz wrote:

Hi Mike

What you say about daylight film makes a lot of sense so I’m eager to test the curves on the website you recommended, but when I try to download the curve all I get is a new webpage with gibberish.

Haven’t seen the site, but try right-clicking on the link and click "Save target As.." (IE).

Cheers,
Nicholas Sherlock

Sarah Feliz wrote:

Hi Mike

What you say about daylight film makes a lot of sense so I’m eager to test the curves on the website you recommended, but when I try to download the curve all I get is a new webpage with gibberish. I get the same result no matter which curve I try to download.
Is there something wrong with this website or am I doing something wrong? I’m working on a Mac — would that make a difference?

Hi Sarah,

Nicholas’s suggestion to use "Save Target As" is a good one. On some browsers it will say something like "Save Link As". If that does not work send me an email and I’ll email you the curve file that way. If you email me one of the images I will do a quick curve for you that you can try on the other images.

It may be causing the problem with the download, but once you have the .acv files you will be able to use them in the Curves dialog.

I have to send this job to the printers today but am hoping to be able to put these curvemeister curves to the test before I do so.

Give the printer a call now and explain the problem. They may have someone in-house who will be going over the images before they are printed, and if you can provide that person with an illustration of how the images should look, he or she may be able to do the match for you.
—
Mike Russell
www.curvemeister.com
www.geigy.2y.net

Chances are they were shot under Tungsten lights eh?

Red/Yellow cast = loss of Cyan/Blue detail. You won’t get that back, but desaturating the reds/yellows and saturating the cyan/blue may help giving something better to look at. If there’s any chance you can just use a greyscale image, then try the red channel maybe…

Cheers, Jason (remove … to reply)
Video & Gaming: http://gadgetaus.com

Thanks to all for answering my question. Your suggestions were great. I was able to color correct using Curves after all. Got most of the red out.

Sarah

On 10/18/04 1:05 PM, in article
bmVcd.32121$, "Mike Russell"
wrote:

Sarah Feliz wrote:

Hi Mike

What you say about daylight film makes a lot of sense so I’m eager to test the curves on the website you recommended, but when I try to download the curve all I get is a new webpage with gibberish. I get the same result no matter which curve I try to download.
Is there something wrong with this website or am I doing something wrong? I’m working on a Mac — would that make a difference?

Hi Sarah,

Nicholas’s suggestion to use "Save Target As" is a good one. On some browsers it will say something like "Save Link As". If that does not work send me an email and I’ll email you the curve file that way. If you email me one of the images I will do a quick curve for you that you can try on the other images.

It may be causing the problem with the download, but once you have the .acv files you will be able to use them in the Curves dialog.

I have to send this job to the printers today but am hoping to be able to put these curvemeister curves to the test before I do so.

Give the printer a call now and explain the problem. They may have someone in-house who will be going over the images before they are printed, and if you can provide that person with an illustration of how the images should look, he or she may be able to do the match for you.

Sarah Feliz wrote:

Thanks to all for answering my question. Your suggestions were great. I was able to color correct using Curves after all. Got most of the red out.

I forgot to suggest Visine!
—

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

I geit. But it wasn’t a question of redeye… These images simply that had a strong red cast, is all.

Sarah

On 10/21/04 9:19 PM, in article
uT%dd.8708$, "Mike Russell"
wrote:

Sarah Feliz wrote:

Thanks to all for answering my question. Your suggestions were great. I was able to color correct using Curves after all. Got most of the red out.

I forgot to suggest Visine!