Hi Listers, : Following recent discussions on GI here's an improved GI post effect. Basically when you apply and RGB curve to brighten dark areas this results in reduced colour saturation as Gary found out. The solution is to change the GI brightness control so it works only on the Value in HSV colour space instead of RGB space. The attached 2 pics demonstrate this.
GI_RGB_curve shows the default system and the GI traced results with a curve acting on RGB. GI_HSV_curve shows the new system and the GI traced results with the same curve acting on V. INSTRUCTIONS FOR INSTALLATION AND USE: The new system uses my RealMan HSV conversion scripts. You may have these already for PhotoGrey or other distributions, but seeing as they're so tiny I'll attach them to this mail as well. These scripts need to be placed in a subfolder "...\Realsoft\Realman\Scripts" or you can place them wherever you want and redirect the VSL realman objects. Of course you'll need RealMan installed as well! Save the attached "ImprovedGIBrightnessControl.r3d" file somewhere sensible like maybe RS's 'posteffects' folder. Load/create any GI scene, delete the existing 'GI_brightness_control' posteffect, and in the posteffects window right click and choose 'paste from a file', then select the 'ImprovedGIBrightnessControl.r3d' file and it'll appear exactly as the default GI_brightness_control. That's all there is to it, and now your GI control won't result in washed out colours in the shadows! David Coombes [EMAIL PROTECTED]
RGB2HSV.Realman
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GI_RGB_curve.png
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HSV2RGBRanged.Realman
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ImprovedGIBrightnessControl.r3d
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GI_HSV_curve.png
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