Explanation of the brightness in Photoshop

This question has been asked before, but he had no answer. The previous discussion is here:what is the definition of brightness in Photoshop?

The term 'brightness' is often used in Photoshop for example brightness mix masks of mode and brightness.

How the brightness is related to the Hue / Saturation / brightness (STL) color model used in the Photoshop color picker?

East - related to the "lightness" in color Lab, or synonym for 'brightness', or what?

Andy

Edit: I found a post of 2008 Re: brightness/color mixing modes - what do really? which may have the answer. Clearly, I need to read more.

In fact, re-read now, I think that I explained myself well enough in this other thread. Here's how it seems to me:

Equal brightness the brightness L channel RGB lab is something different, the average of R, G and B, which does not take account of the intrinsic lightness of a color. He's averaging only numbers. And all of this makes perfect sense, given that Lab is used as the 'profile connection space' (or one of them anyway), in all color management operations, what Photoshop does all the time anyway. The point is - Lab numbers are always readily available and easily accessible. Lab is still there, under the covers.

Applying a kind of calculation of RGB values for brightness is a dead-end road, this isn't how it works. HSB is derived from RGB, so there is no connection with the brightness.

If you set the histogram on the 'Brightness' display with a RGB file, you get the same result as a reading of channels L in a histogram of laboratory. So clearly, they seem to be the same thing.

The only person who could answer that with authority, is of course, Chris Cox, who wrote much of the code of the Photoshop color management. If all goes well, he sees this.

Tags: Photoshop

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