Comments on: Image Filter Theatre: HSB Mixer http://losingfight.com/blog/2007/01/25/image-filter-theatre-hsb-mixer/ because i don't write software for windows Mon, 27 Feb 2012 21:23:01 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: Ahruman http://losingfight.com/blog/2007/01/25/image-filter-theatre-hsb-mixer/comment-page-1/#comment-378 Ahruman Tue, 02 Oct 2007 20:21:09 +0000 http://www.losingfight.com/blog/2007/01/25/image-filter-theatre-hsb-mixer/#comment-378 Never mind, I found my answer. :-) Never mind, I found my answer. :-)

]]> By: Ahruman http://losingfight.com/blog/2007/01/25/image-filter-theatre-hsb-mixer/comment-page-1/#comment-377 Ahruman Tue, 02 Oct 2007 20:05:49 +0000 http://www.losingfight.com/blog/2007/01/25/image-filter-theatre-hsb-mixer/#comment-377 I came here by searching for cikernel HSVRGB conversion code. You’ve got just what I was looking for. Unfortunately, no license appears to be specified…? Incidentally, the behaviour people are likely to expect from this type of filter can be achieved by changing the clamp line for the h channel to: hsvPixel.r = mod(hsvPixel.r + inputHue, 6.0); Then again, the standard Hue Adjust filter already does this. “Notice that the vec4 data type always assumes rgba…” You can also refer to the components as xyzw or stpq. I’ll be using xyz and a to avoid confusing HSV and RGB values. I came here by searching for cikernel HSVRGB conversion code. You’ve got just what I was looking for. Unfortunately, no license appears to be specified…?

Incidentally, the behaviour people are likely to expect from this type of filter can be achieved by changing the clamp line for the h channel to:
hsvPixel.r = mod(hsvPixel.r + inputHue, 6.0);
Then again, the standard Hue Adjust filter already does this.

“Notice that the vec4 data type always assumes rgba…”
You can also refer to the components as xyzw or stpq. I’ll be using xyz and a to avoid confusing HSV and RGB values.

]]> By: John C. Randolph http://losingfight.com/blog/2007/01/25/image-filter-theatre-hsb-mixer/comment-page-1/#comment-376 John C. Randolph Fri, 26 Jan 2007 15:43:50 +0000 http://www.losingfight.com/blog/2007/01/25/image-filter-theatre-hsb-mixer/#comment-376 FYI, you can also try out your GLSlang code in a "Core Image Kernel" patch in Quartz Composer. Can't beat that immediate feedback! -jcr FYI, you can also try out your GLSlang code in a “Core Image Kernel” patch in Quartz Composer. Can’t beat that immediate feedback!

-jcr

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