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Desaturate Clips Negative Values

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Sphinx.
Filter Optimizer

Posts: 1344
Filters: 38
 Even though it should be "HDR", "Desaturate" component clips negative values to zero
Njyldgarkn sample cache!
Posted: June 1, 2012 10:06 am   Details E-Mail
inujima

Posts: 107
Filters: 20
 Desaturate component at Weighted Average mode is using gamma corrected RGB values.
And output form is as follows.
output = (R ^ 2.2 * 0.3 + G ^ 2.2 * 0.59 + B ^ 2.2 * 0.11) ^ (1 / 2.2)
Probably using gamma corrected value is reason that negative value is clipped.
Posted: June 4, 2012 8:00 pm   Details E-Mail
GMM
Moderator
Filter Forge, Inc
Posts: 1726
 Thanks for reporting, the fix will be available in the next update.
Posted: June 5, 2012 7:18 am   Details E-Mail

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