L*a*b* image manipulation (was: Change PCS of CLUT input profile)
L*a*b* image manipulation (was: Change PCS of CLUT input profile)
- Subject: L*a*b* image manipulation (was: Change PCS of CLUT input profile)
- From: Mark <email@hidden>
- Date: Thu, 11 Oct 2007 11:11:53 +0200
Hello Steve, list
[snip]
yes but be careful with Lab. It's a reasonable exchange space but
manipulations in it can expose its flaws. De-saturating blue, for
instance will turn them purple if you simply move in polar
coordinates.
Now you really got me, I was hoping LAB would be the perfect color
space for saturation, tone mapping, sharpening,.... manipulations. I
was hoping that changing saturation in LAB was just a matter of
applying a multiplication to a*b and that tone mapping could be
easily done with L* without affecting color.
Is LAB particularly bad or does it just have it's flaws (as probably
every color space has). What is it good for?
What would be the best space for saturation manipulations, YCbCr, RGB ?
Thanks again. Regards,
Mark
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