Re: behaviour of colour wheels

>> The colorweel lets you select a color, the question is how that color
>> is applied to the image, ie. is it an add, mult or gamma?
>Yes, this is exactly what I am wondering about.
>
>> An add or mult will affect your white points, 1, gamma will not.
>How does add or mult affect the whites? If I add onto white, it will stay
>white - or the result will be over-white and then get clipped to white. 
>This is what I think Photoshop does. If you move the R slider right it
>adds red, if you move it left, it subtracts red. This obviously would not
>affect white, since white plus anything is still white in RGB.

 Im not sure how photoshop does it, but matrix rotation (or hue rotation)
does not affect white point. Try a google search on:
hue rotate haeberli

 best regards,
  Paul


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