Black and White

What do humans see?

The human eye is most sensitive for yellow-green light. Take a look at the next gradient for instance:
Color gradient image

To me, indeed the green-to-yellow part looks brightest. Not so to Photoshop however.

About a hundred ways to lose the color

Well, maybe not thàt much, but quite a few anyhow. The easiest way (but offering zero control) would be to go through Image > Mode > Grayscale. That’ll give you this:
Gradient image converted to grayscale

Your image just became 1/3 of the original size, and that weight loss is caused because there’s now only a ‘gray’ channel instead of a red, green and blue one.
Big drawback of this method, is that it’s destructive: You indeed loose the color: It’s gone for good. Since you also have zero control, I’d never use this method.

Layers

So, we want something that’s reversible. Lots of ways to do that, using (adjustment) layers, but not all of them good… Let’s start off by naming just about the worst way imaginable: Desaturate. What this does, is that it removes all color information from an image, without the option for any user intervention. While that may or may not be important to you, this should be: All colors are treated as if they were equal.
While equality is a great thing, in this case, it isn’t, since to us different colors aren’t equal. Read the rest of this entry »

© copyright 2008 René Damkot Fotografie
Design by: styleshout     Valid CSS | XHTML