CompuServe Messages

The alpha>0 option certainly has some use in a two-layer situation. It limits the image-processing effect to look at pixels in just the live area, effectively ignoring anything in the black portions of the image. The alpha=0 option is simply the reverse, which rounds out the alpha controls by limiting the effect on just the areas of the image with no alpha, so the effect looks at pixels in the layer behind it. (This is effectively the same as putting the image processing effect one-layer back.) You certainly aren't forced to use either option, and as it says in the docs, "For general use, leave the Filter Parameter set to Whole Image". For multi-layer effects, your problem is basically that you can't use the Alpha>0 option because the multiple layer's alpha channels are combining on you. I've uploaded an IXP called NOALPH.IXP that can strip out the alpha channel from a Video Post sequence, overcoming that limitation. Here's an example of how it would be used. PART1.TGA, PART2.TGA, PART3.TGA — all 32-bit images The Video Post sequence: PART1.TGA Alpha GLOW_I.IXP Alpha>0 NOALPH_I.IXP PART2.TGA Alpha MONO_I.IXP Alpha>0 NOALPH_I.IXP PART3.TGA Alpha HILITE_I.IXP Alpha>0 NOALPH_I.IXP [KF Scene] BLUR_I.IXP Alpha>0 This sequence will operate as expected on each layer of the image — glowing part1, monochroming part2, etc. Regarding your comment about an "additive" alpha bit… it's not a bad idea, and we'll keep it in mind for the future. So… I've got to get back to work now. Enjoy noalph.ixp. – G