02-20-2023 01:01 PM
It has been many decades since I studied color spaces. I have forgotten much. Thanks in Advance.
In DPP, it seems that the saturation slider in the "basic image adjustment" does something different than the saturation slider in "Adjust image colors". Is this simply because one is working in RGB color space while the other is working in HSL color space?
Is moving the saturation slider in "Adjust image colors" the same as moving each of the individual saturation sliders by the same amount?
Other software has a "vibrance" slider. Is this the equivalent of moving the saturation slider in "Adjust image colors" but not the saturation slider in "basic image adjustment"?
02-20-2023 02:00 PM - edited 02-20-2023 02:08 PM
Canon : Product Manual : Digital Photo Professional (start.canon)
Saturation vs. Vibrance
Saturation intensifies all the colors in your images. Vibrance is more specific and its effect is focused on the mid-tones of an image. Mid tones are whats between the darkest and lightest areas in an image. (shadows vs highlights)
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02-20-2023 03:08 PM
Thanks. I have looked at the manual.
If the DPP basic saturation slider were operating in the RGB cube color space and if the DPP adjust image colors saturation slider were operating in the HSL color space, then so far as I can remember a straight line through one color space would not pass through the same points as a straight line through the other color space. Is that correct?
On a discussion by GMIC developers, vibrance was compared to something similar to:
/opt/local/bin/gmic input IMG_3355cs.TIF keep normalize 0,255 srgb2rgb rgb2hsv sh 1 mul. 1.10 rm. hsv2rgb rgb2srgb normalize[-1] 0,65535 output[-1] IMG_3355csv.tiff,uint16,lzw,0,1 ; echo "Vibrance"
And the GMIC command line above does seem to me to increase saturation more like the "adjust image colors" saturation slider in DPP than like the basic saturation slider even though GMIC is using yet a third color space and the multiply will choose points on a straight line through the color space.
Yet another approach in DPP is to follow the "tone curves adjustments" example in the DPP manual which is labeled "Sharpens the image". This is easily applied to mostly mid-tones. My guess is that this results in a curved path through one of the color models and not a straight line.
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