Filter Forge - Extract B in HSB ignores sign

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Sphinx. Filter Optimizer Posts: 1750 Filters: 39	B in the HSB model is the brightest of the RGB input channels. However negative input seems to break that principle (it clamps to zero). Try inputting R = G = B = -0.01. The output should be -0.01, but is 0. Njyldgarkn init/prepare process x no. of render blocks x no. of passes
	Posted: April 15, 2010 3:48 am	Details E-Mail
GMM Moderator Filter Forge, Inc Posts: 3491	This behavior is by design. If the B channel in a HSB or the Y channel in a HSY image is negative it will be clipped to 0. Try the RGB color model instead.
	Posted: April 15, 2010 5:45 am	Details E-Mail
Sphinx. Filter Optimizer Posts: 1750 Filters: 39	Ok, hmm. The conversion is not reversible then. Perhaps it should not promote HDR support. Anyways I use B extraction as a fast way of getting Max(R, G, B), which otherwise would require setting up several components. Njyldgarkn init/prepare process x no. of render blocks x no. of passes
	Posted: April 15, 2010 7:28 am	Details E-Mail

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