thanks for that formula. funny.
another question reg. the bechbox instructions:
http://www.bechbox.dk/pwl/
there is something i dont understand:
point 3:
"Step 3: Color control
Here's a great way of controlling color - it can give you a dramatic effect or a very subtle one.
First make a new layer and merge all visible layers into that (Cmd-Option-Shift-E). Name it 'color'.
Now select 'Channels' in the layer palette and go through the Red, Green and Blue channels. Copy the ones you like (sometimes I use all three) to a new layer under 'Layers' and name it accordingly. Place these B&W layers beneath the 'color' layer as shown in the image to the right, where you can see that for this image I chose the green and the blue layer.
Go to the 'color' layer and change the blending mode to Color. Cool eh?
Now it's time to experiment! Change the opacity of the B&W layers to blend them together - maybe even try changing the blending modes. Often I use the opacity slider of the 'color' layer as a saturation control to desaturate, but with this image I didn't do that."
> "Place these B&W layers beneath the 'color' layer as shown in the image to the right, where you can see that for this image I chose the green and the blue layer.
Go to the 'color' layer and change the blending mode to Color. Cool eh?"
... i dont see any effect when placing the 2 or 3 RGB channels as a layer each above the main layer. did he mean to set the RGB greayscale layer also to blend mode "color" or not?
thx