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Old 27th August 2008, 11:13   #11  |  Link
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mikeytown2's Avatar
Join Date: Apr 2005
Location: Seattle, WA
Posts: 623
Now I remember why I didn't like non scripting languages... constructors!

I think Gimp's Preserve Luminosity is broken, or at least it's suffering from rounding errors. did a quick compare with this image from wikipedia

GIMP - Shadows
-54, -16, 17
Preserve Luminosity checked

ColorBalance([<"LOW Cyan-Red", -100.0, 100.0, -54.9>],[<"LOW Magenta-Green", -100.0, 100.0, -16.6>],[<"LOW Yellow-Blue", -100.0, 100.0, 17.4>], \
[<"MID Cyan-Red", -100.0, 100.0, 0.0>],[<"MID Magenta-Green", -100.0, 100.0, 0.0>],[<"MID Yellow-Blue", -100.0, 100.0, 0.0>], \
[<"HI Cyan-Red", -100.0, 100.0, 0.0>],[<"HI Magenta-Green", -100.0, 100.0, 0.0>],[<"HI Yellow-Blue", -100.0, 100.0, 0.0>])

Both give this when not Preserving Luminosity

Using Midtones in gimp doesn't give awful results with Preserve Luminosity Checked.
Interesting... http://www.larryjordan.biz/articles/lj_color.html. sounds like ColorYUV(), but with a nice looking GUI. Thanks Gavino for pointing this out in your 2nd post and to Mug Funky for pointing to a nice GUI. Looks like http://avisynth.org/mediawiki/Histogram#Color2_mode would be useful

Edit 2: CinePaint with same settings as Gimp

Looks like 16bit helps a little bit, but not a lot

Last edited by mikeytown2; 27th August 2008 at 12:42.
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