TyG Member 137 posts Joined Mar 2008 More info | Jul 29, 2008 09:26 | #1 With a black and white image, how much difference is there from rgb to cmyk. I'm sending some greeting cards to a printer, they say to convert to cmyk; I've got photoshop elements and cannot convert. So, i'm wondering if the black and white is altered in this conversion.
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airfrogusmc I'm a chimper. There I said it... More info | Jul 29, 2008 09:36 | #2 Allot of comercial prints need CMYK because thats how they're set up Cyan, magenta, yellow and K+black. They can convert but will probably charge you to do so. I don't know anything about elements but its an easy conversion in photoshop CS. Mode/CMYK.
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dave_bass5 Goldmember  4,329 posts Gallery: 34 photos Best ofs: 1 Likes: 303 Joined Apr 2005 Location: London, centre of the universe More info | Jul 29, 2008 09:54 | #3 Ty G wrote in post #6006362  With a black and white image, how much difference is there from rgb to cmyk. I'm sending some greeting cards to a printer, they say to convert to cmyk; I've got photoshop elements and cannot convert. So, i'm wondering if the black and white is altered in this conversion. maybe you could send the file to someone on here that could convert it for you if its not too large. Dave.
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Jul 29, 2008 10:00 | #4 Ok, just for kicks could someone bring these pictures in to their CS2 for me and convert it to cmyk and repost. pretty please?!  HOSTED PHOTO please log in to view hosted photos in full size.
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RenéDamkot Cream of the Crop  39,856 posts Likes: 8 Joined Feb 2005 Location: enschede, netherlands More info | Jul 29, 2008 10:12 | #5 US WebCoated (SWOP) v2:  HOSTED PHOTO please log in to view hosted photos in full size. "I think the idea of art kills creativity" - Douglas Adams
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dave_bass5 Goldmember 4,329 posts Gallery: 34 photos Best ofs: 1 Likes: 303 Joined Apr 2005 Location: London, centre of the universe More info | Jul 29, 2008 10:19 | #6 Ive done it but when i upload it to smugmug it gets converted to RGB. Dave.
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Peano Goldmember  1,778 posts Likes: 133 Joined Aug 2007 More info | Jul 29, 2008 10:22 | #7 Ty G wrote in post #6006524 Ok, just for kicks could someone bring these pictures in to their CS2 for me and convert it to cmyk and repost. pretty please?! Converted (U.S. Web Coated (SWOP) v2:  ---
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Jul 29, 2008 10:28 | #8 Rene & Dave, thank you. Rene, am I correct in that I am only seeing some saturation/hue differences in the color portion of the image? The tones and contrast in the black and white do not seem to change? I sent this image because it is the only one with any color in it. All of my others are purely B/W.
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Jul 29, 2008 10:48 | #9 Peano, I was really wondering about the first two images you had up there. Thank you for your re-processing as well. I can see where if I sent in a colorful beach scene, the conversion would drive me nuts, yet for my B/W, it doesn't seem to make much of an impact.
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Peano Goldmember 1,778 posts Likes: 133 Joined Aug 2007 More info | Jul 29, 2008 11:55 | #10 Ty G wrote in post #6006754 Peano, I was really wondering about the first two images you had up there. Thank you for your re-processing as well. I can see where if I sent in a colorful beach scene, the conversion would drive me nuts, yet for my B/W, it doesn't seem to make much of an impact. Yes, I couldn't understand the change in color. When I tried to open the image locally in Firefox, I got an error box saying the image was defective. So I re-saved it, and the color returned to normal. I don't see any difference between RGB and CMYK. ---
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airfrogusmc I'm a chimper. There I said it... More info | Your monitor sees color in RGB so it may or may not see color accurately in CMYK and then theres all the variables. The import place to see color is at the printer with his equipment and his calibrations. Thats why it can be important if color is VERY important to go on a press run because they can make color changes right there and you can see exactly how the paper is taking the ink. Probably not an option in your case.
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RenéDamkot Cream of the Crop 39,856 posts Likes: 8 Joined Feb 2005 Location: enschede, netherlands More info | Jul 29, 2008 12:20 | #12 Right, I must have been asleep or something...
edit: And as a result will not display in FF2... It shows in FF3 and Safari however.. If you quote my post, you should be able to see the link and save it  "I think the idea of art kills creativity" - Douglas Adams
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Damo77 Goldmember  4,699 posts Likes: 115 Joined Apr 2007 Location: Brisbane, Australia More info | Sorry I'm late to this party ...  HOSTED PHOTO please log in to view hosted photos in full size. (Yes, I know, Custom CMYK in PS is the tool of the devil, blah blah blah ... believe me, this is a damn good way of doing things) Here is my effort:  HOSTED PHOTO please log in to view hosted photos in full size. For best results, I: 1. Opened your RGB file, and duplicated it. 2. Converted one copy to SWOP CMYK (as mentioned above) 3. Loaded the above custom CMYK setting in my Color Settings 4. Converted the second copy to this "4-colour mono" CMYK. The blacks are 35,25,25,100. (The trouble with this setting is that it kills dark colours, basically converts them to dark shades of grey. So that's why I need both versions) 5. Pasted the SWOP CMYK on top of the custom CMYK (making sure the colour values remained unchanged) 6. Used a Layer Mask to reveal only the pink item from the SWOP layer. 7. Flattened 8. Saved untagged (not sure if this is the safest option, but I don't want some person or program trying to re-convert my tagged file to another form of CMYK - that would defeat the purpose, of course).
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