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08/15/2005 11:30:11 PM · #1 |
I'm using Photoshop 7.0 and have painstakingly for hours brought a photo within gamut for printing. By habit, I did not apply USM until the very last step. When I did, lo and behold, many many new gray pixels appeared warning me that they do not bow to the printer gods.
Is there a way to constrain the colors the computer can pick while applying USM? |
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08/16/2005 01:01:20 PM · #2 |
bump, cuz I want to learn. I did glean a tidbit of info I hadn't had before, thought I'd pass it on. When selecting a color range you can click a dropdown box in that dialog box and select "out of range". All out of gamut colors will be selected. Wish I had known that 10 hours of work ago...
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08/16/2005 01:49:33 PM · #3 |
The only way I know to limit the colors is to put it into "Indexed Color" mode, and I don't think that can give you a wide enough gamut.
The USM filter works by slightly darkening the dark pixels and lightening the light pixels at a color junction. I don't know of any way to make those new colors stay within a specified gamut.
When you say you "brought within gamut for printing" what exactly do you mean, because their are many printing methods and as many printer gamuts. There's a huge difference between photographic prints on a Fuji Frontier and printing postcards on an offset press. |
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08/16/2005 02:13:26 PM · #4 |
I use an online printing company. In talking to them they say the "working CMYK" is close to their gamut. (they use a 6-color inkjet). They prefer the files, naturally, in RGB mode though.
So while working on my picture, in RGB, I would look at the gamut warning frequently and try to have zero to as few gray pixels as possible. I would accomplish this through multiple methods (cloning them out, selecting them and changing selective colors, desaturation, etc.)
Here are links to an unaltered 100% crop and one after the work has been done. You can see the oranges especially are not as deep.
Unaltered crop
Altered crop
I am a little concerned about the pixelation on the green background. Not sure where that crept in. |
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08/16/2005 02:18:20 PM · #5 |
Sorry, I'm not much help with the actual colors.
Maybe they have a profile for that printer? |
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08/16/2005 02:32:05 PM · #6 |
Don't use Index color mode unless you want to save it as a GIF for a web site. And only then if it has large blocks of the same color...otherwise that is what JPEG is for...
many printers will be fine with RGB files. CMYK is problematic when you are used to a wide gamut RGB space like AdobeRGB--don't use SRGB unless you are only going to use it online--and especially something like an orange flower on a green background....
the range between red and yellow is one of the first parts of the RGB spectrum to really get killed by CMYK conversion.
if you are having it printed by an offset press, see if they can give you a CMYK profile that matches their printer....but don't expect it to be exactly the same as your beautiful RGB original.
I use a selective color adjustment layer to get a lot of the color back into a CMYK image, it's available in PS7, you should try it.
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