Avoiding Pixlation

Hi Guys,

I’m trying to make a poster for a friend, however when I resize one of the images and print it, the end result is all blocky and horrible.

Any ideas?

Filter – > Sharpen didn’t work !

Thanks in advanced

D

"Deviant Devanti" wrote in
news:DNeGc.69$:

Hi Guys,

I’m trying to make a poster for a friend, however when I resize one of the images and print it, the end result is all blocky and horrible.
Any ideas?

Work at the actual size or larger of the final piece. Never upsample anything.

Filter – > Sharpen didn’t work !

Of course not, since it sharpened the upsampling artifacts.

On Mon, 05 Jul 2004 16:24:19 GMT, Eric Gill
wrote:

"Deviant Devanti" wrote in
news:DNeGc.69$:

Hi Guys,

I’m trying to make a poster for a friend, however when I resize one of the images and print it, the end result is all blocky and horrible.
Any ideas?

Ordinal file is a bit small, if it is all you got you can try to GBlur it first to take the edge off the pixels. Blow it up half way then put some noise back in it. It will look softer but can hide the pixlation. Depends on how far you have to enlarge and what the original was.

Work at the actual size or larger of the final piece. Never upsample anything.

Not true, if we worked at size for all our prints, I would have to buy 50X250Gb drives just to keep the data.
I’m not saying that you shouldn’t work at size on some thing, but you have to take into account, quality of original (no point scanning a 50Mb file of a soft blurry 35mm slide), what its being printed on (72DPI printer or 4000DPI printer) and viewing distance (why have something sharp if its going up on the side of a building?)

Filter – > Sharpen didn’t work !

Of course not, since it sharpened the upsampling artifacts.

Yep, you will only sharpen what is all ready there, which is piles.

Deviant Devanti wrote:

Hi Guys,

I’m trying to make a poster for a friend, however when I resize one of the images and print it, the end result is all blocky and horrible.
Any ideas?

Filter – > Sharpen didn’t work !

A few others have mentioned upsampling problems. Depending on the original resolution of the document, you can make the image print larger by reducing the resolution but not resampling in the "image size" dialog box.

For instance, if you have a 600 dpi image and reduce it to 200 dpi but don’t resample (uncheck the "resample image" box), the image dimensions will increase. However, depending on your printer, this will degrade the quality of the print out but it won’t be nearly as bad as upsampling.

For print outs from an inkjet printer, 1/3 the maximum printing resolution of the printer is usually optimal (for instance, on a 1200 dpi printer, you’d want a 400 dpi image) so you might want to factor this into what you set the resolution at. For professional prints, 200-300 dpi is usually fine, sometimes lower is okay but you have to discuss it with your printer.

Orchid

Ya know …

Sir Isaac Newton’s THIRD law of physics states… For every action, there is an equal and opposite reaction…

With that in mind you can NEVER EVER up-sample a low resolution image into a high resolution image… you MUST ALWAYS start with a high resolution image… no way around that one.

"Deviant Devanti" wrote in message

Hi Guys,

I’m trying to make a poster for a friend, however when I resize one of the images and print it, the end result is all blocky and horrible.
Any ideas?

Filter – > Sharpen didn’t work !

Thanks in advanced

D

Found this in some book. sorry I can’t remember the title. anyway. Seems you can upsize pics at 10% intervals with little or no degradation. I know, sounds wrong but I have taken a 300dpi 6×9 and blew it up to 2×3 ft. swear, Scouts honor.
Go to Image > Image size > document size 110% width, constrain prop/resample (weird huh?).
Set up an action mapped to a F key because the percent parameters always reset.
Do see some loss at HUGH proportions, but for average blow up its great.

"Deviant Devanti" wrote in message

Hi Guys,

I’m trying to make a poster for a friend, however when I resize one of the images and print it, the end result is all blocky and horrible.
Any ideas?

Filter – > Sharpen didn’t work !

Thanks in advanced

D

also watch the file size, it grows Very quickly…..

"vern" wrote in message

Found this in some book. sorry I can’t remember the title. anyway. Seems you can upsize pics at 10% intervals with little or no degradation. I

know,

sounds wrong but I have taken a 300dpi 6×9 and blew it up to 2×3 ft.

swear,

Scouts honor.
Go to Image > Image size > document size 110% width, constrain prop/resample (weird huh?).
Set up an action mapped to a F key because the percent parameters always reset.
Do see some loss at HUGH proportions, but for average blow up its great.

"Deviant Devanti" wrote in message

Hi Guys,

I’m trying to make a poster for a friend, however when I resize one of

the

images and print it, the end result is all blocky and horrible.
Any ideas?

Filter – > Sharpen didn’t work !

Thanks in advanced

D

vern wrote:

Found this in some book. sorry I can’t remember the title. anyway. Seems you can upsize pics at 10% intervals with little or no degradation. I know, sounds wrong but I have taken a 300dpi 6×9 and blew it up to 2×3 ft. swear, Scouts honor.
Go to Image > Image size > document size 110% width, constrain prop/resample (weird huh?).
Set up an action mapped to a F key because the percent parameters always reset.
Do see some loss at HUGH proportions, but for average blow up its great.

I just tried that like I already had before a couple of times and I find the results *better* when I upsize in one go compared to the stepping method. At least in Photoshop CS… As far as I am concerned at least for photos it’s a myth.

You may want to try Frank’s Less Loss Resize action, available (free) from adobe studio exchange. Haven’t thoroughly tested it, some people seem very happy with it.

I also tried Photozoom Pro which includes other algoritms for resizing, like B-spline, Lanczos and S-spline. I think I am actually going to spend some money on it. http://www.trulyphotomagic.com/shortcut/customer/content.php

Irfanview (still free) also has several different resizing algoritms I believe. Must check that out before I buy Photozoom 😉
http://www.irfanview.com

To be honest I am surprised Photoshop still only packs the bicubic method for quality resizing, albeit it now includes bicubic sharper and bicubic smoother for up/downsizing.

HTH
Pjotr

Pjotr Wedersteers wrote:

vern wrote:

Found this in some book. sorry I can’t remember the title. anyway. Seems you can upsize pics at 10% intervals with little or no degradation. I know, sounds wrong but I have taken a 300dpi 6×9 and blew it up to 2×3 ft. swear, Scouts honor.
Go to Image > Image size > document size 110% width, constrain prop/resample (weird huh?).
Set up an action mapped to a F key because the percent parameters always reset.
Do see some loss at HUGH proportions, but for average blow up its great.

I just tried that like I already had before a couple of times and I find the results *better* when I upsize in one go compared to the stepping method. At least in Photoshop CS… As far as I am concerned at least for photos it’s a myth.

You may want to try Frank’s Less Loss Resize action, available (free) from adobe studio exchange. Haven’t thoroughly tested it, some people seem very happy with it.

The above mentioned action does more than just increase at 110% steps. It also uses sharpening in between those steps and that is why it seems to work. You can fine tune it by changing the ‘bucubic’ interpolation steps to ‘bicubic smoother’ if you use Photoshop CS. The results are very similar to Photozoom Pro (at least up to 200%, for a larger increase it seems that methods like Photozoom or Genuine Fractals are better), but the action is free. I do agree with you that simply upsizing in 110% steps is a myth.

—
Johan W. Elzenga johan<<at>>johanfoto.nl Editor / Photographer http://www.johanfoto.nl/