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DPChallenge Forums >> Photography Discussion >> Convert to B&W for beginners
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03/01/2006 09:12:32 PM · #1
I ended up entering a duotone in the Fashion challenge... I guess I was conflicted... Anyway, I got to play with different ways of converting a color image to B&W and just wanted to share with folks who may be learning this stuff, too.

This is an outtake from my Fashion "shoot" - and let me just say that I really want to thank my model. He was very patient and held very still for me...



If you simply convert this image to grayscale, which is based on luminousity (or so I'm told), you get this:



Rather dark and dull, huh? So I tried using the channel mixer thing in Photoshop (which I'd not tried before), selected Red 100%, then checked the Monochrome box, and got this:



Way better! At least to me, anyway.

To do the duotone (as a lot of you did for the last challenge), I converted the channel mixed version to grayscale, then picked a purple duotone, then converted back the RGB mode so it could be saved as a jpeg.



Not a ribbon winner to be sure, but I like it better than the original. And learned lots, too!
03/01/2006 09:37:37 PM · #2
Nice set of comparisons. One clarification:

When you use Photoshop's "Convert to Grayscale" under "modes", it doesn't work by "luminance", it applies a particular, generalized agorithm of x% R, y% G, and z% B channels. I'm not sure of the exact numbers. When you do it with Channel mixer, you can customize the mix.

If you want a straight "luminance" conversion, go to "mode" and convert to Lab color, then toss channel a and channel b, leaving the "lightness" channel only, a grayscale-like image that did not take color into consideration at all, just luminance. Working from your original as posted, that gave me the following:



Note the slight differences from the Photoshop grayscale conversion. The differences will be more pronounced in a more polychromatic image, but the BG here is a little less muddy and the highlights a little more luminous.

Then you convert THAT to grayscale mode and apply your duo/tri/quad tones to that if you like.

R.

Message edited by author 2006-03-01 21:39:05.
03/01/2006 09:41:44 PM · #3
Cool! Learn something new every day. Yes, the Lab color does a much better job that grayscale - thanks for sharing that!
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