I use a PC with Dual Monitors which is great for Photomanipulation work. For monitor calibration I use a print company and they send 2 pictures a black and white and color print. You then go to their web site and adjust your monitor/s to best match what you see on your screen to the prints they send you. That calabrates your monitors to their equipment or print setup and has worked great for me for me
Jeep

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See [link] for my Art Work

heh. you didn't have a category for both
I use both at my job, but have PC at home. I also have dual monitor...but I can tell you to your recent problem, that older monitors , different kinds of monitors make a difference on the color. I try to view my work on a couple of computers before sending it off to print. What dreamweaver69stock suggested is also great if you have someone who will do that for you

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I dream my paintings, then I paint my dreams. ~Vincent van Gogh

very smart. im not quite satisfied with my skill of photomaniping or digital photography to have prints made yet, but i will, and once i do, ill try that.

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Jeep

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See [link] for my Art Work