Quote:
Originally Posted by John K
and it would be great if you can share some more about the concept of creating a synthetic Luminance channel from the layered R,G,B channels in Photoshop. Sounds interesting.
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John,
I take the processed R, G and B channels and layer them in a new image in photoshop. I stack them by changing the opacity of layer 2 to 50% and layer 3 to 33%. I flatten the image and then do some mild noise reduction and a high pass filter (sharpening).
I then adjust the curves (contrast) and flatten the image.
I then copy that image, which is now the synthethic luminance image, and paste it as a new layer on top of the original RGB image. I change the blending mode of that layer to "Luminance" - which you can see the effect of by "blinking" the visibility of that layer on and off. It's using the "detail" from the luminance layer and the colour from the RGB layer. It (usually) has the effect of producing a smoother, more detailed image.
I then process the combined image in the normal way, to personal taste. Curves, levels, colour balance, saturation etc.
The same method (but with real luminance, not synthetic) can be used by those using a monochrome DMK/LU075 (Matt/DP) to capture the luminance and a ToUcam to capture the RGB (colour) data.
Hope that helps.