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Photoshop F.A.Q (Last Updated: 2024 Nov 04 10:41 pm)

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Subject: Modes


adam ( ) posted Tue, 14 March 2000 at 11:46 PM · edited Sat, 03 August 2024 at 11:55 AM

I am not too familiar with Lab color and Multichannel modes. What are these, and are they helpful for any reason (printing, resolution, etc)? ~Adam


jnmoore ( ) posted Wed, 15 March 2000 at 11:31 AM

Adam, The short answer is "no". CIE Lab is an international standard. I've seen it on Kodak Photo CD's, but nowhere else. It has one small advantage: There are 3 channels, two are for color only and the third is called the luminance channel. This channel has ALL of the detail information for the picture and is in black & white. If you have an image with which you are having sharpness problems, or contrast problems, you can adjust (or sharpen) the lumanance channel only and your colors will be left unnaffected (pretty much, anyway). You can adjust the color channels, using the curves, but you will be able to make coarse adjustments only (it is almost impossible to make fine adjustments in CIE Lab mode). I'm not familiar with the multi-channel mode, so can't help you out there. -Jim BTW check out my 1st ever textures & morphs in the Poser section. It's back away by now, but do a search using jnmoore.


adam ( ) posted Wed, 15 March 2000 at 7:26 PM

thanx Jim! I will check out your morphs and textures soon. ~Adam


Jim Burton ( ) posted Sat, 18 March 2000 at 5:16 PM

Adam- Most useful thing I've seen I've seen to do with Lab color is convert PC images to Mac gamma and visa-versa. Lab is gamma independant, so if you convert a RGB imabe to LAB, they swith your RGB setup to another gamma (the one in Photoshop, not the one in control panels) and then convert it back to RGB you have just converted it for the other gamma. This is now the recommended method of gamma conversion, I think, as it is more exact than using Image, Adjust, Levels.


adam ( ) posted Sun, 19 March 2000 at 2:05 AM

oh, thanx Jim


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