Comments on: Photoshop Blend Mode Math http://www.nathanm.com/photoshop-blending-math/ Programming magic, glory, and juices. Wed, 28 Jul 2010 13:26:36 +0000 hourly 1 http://wordpress.org/?v=3.0 By: Andrew http://www.nathanm.com/photoshop-blending-math/comment-page-1/#comment-145448 Andrew Mon, 21 Jun 2010 19:42:36 +0000 http://www.nathanm.com/photoshop-blending-math/#comment-145448 @Burkhard: Photoshop may be converting colorspace to L.a.b. space and then desaturating. Once desaturated, the colors are probably converted back to RGB (or CMYK depending on preference). @Burkhard: Photoshop may be converting colorspace to L.a.b. space and then desaturating. Once desaturated, the colors are probably converted back to RGB (or CMYK depending on preference).

]]> By: Andrew http://www.nathanm.com/photoshop-blending-math/comment-page-1/#comment-145447 Andrew Mon, 21 Jun 2010 19:40:21 +0000 http://www.nathanm.com/photoshop-blending-math/#comment-145447 Thank You for this resource. This is very helpful. I just graduated with a masters working in GPGPU programming. I've been wanting these algorithms for years. Thank You for this resource. This is very helpful.
I just graduated with a masters working in GPGPU programming. I’ve been wanting these algorithms for years.

]]> By: canjiang ren http://www.nathanm.com/photoshop-blending-math/comment-page-1/#comment-142986 canjiang ren Wed, 12 May 2010 03:04:31 +0000 http://www.nathanm.com/photoshop-blending-math/#comment-142986 hello, the the normal mode seems to be: #define ChannelBlend_Normal(B,L) ((uint8)(L)) the L is the source color (top layer, contrast to the backdrop color). hello, the the normal mode seems to be:
#define ChannelBlend_Normal(B,L) ((uint8)(L))
the L is the source color (top layer, contrast to the backdrop color).

]]> By: jauw http://www.nathanm.com/photoshop-blending-math/comment-page-1/#comment-142940 jauw Tue, 11 May 2010 02:37:02 +0000 http://www.nathanm.com/photoshop-blending-math/#comment-142940 @gonzobrains I don't know how to get the image to appear bruised by just using blending tools, but I have two suggestions. A. You could simple find another image that has bruises and mask the two images together, or B. You could look for bruise brushes available for download (deviantart is usually a good source for that). Hope that helps. (: @gonzobrains

I don’t know how to get the image to appear bruised by just using blending tools, but I have two suggestions.

A. You could simple find another image that has bruises and mask the two images together, or
B. You could look for bruise brushes available for download (deviantart is usually a good source for that).

Hope that helps. (:

]]> By: Jeff http://www.nathanm.com/photoshop-blending-math/comment-page-1/#comment-139615 Jeff Mon, 08 Mar 2010 23:55:05 +0000 http://www.nathanm.com/photoshop-blending-math/#comment-139615 These are awesome, man! Thanks! Can you give me an idea what effects I need in order to programmatically "bruise" an image? For example, I want to darken colors on a photo to make a person appear to be injured. I'm not quite sure how to blend the colors. I've tried just subtracting RGB values to darken it. I've tried to make the color go towards a shade of brown. They don't look quite that realistic. Any idea? What's the C code for that? Thanks again! gonzobrains These are awesome, man! Thanks! Can you give me an idea what effects I need in order to programmatically “bruise” an image? For example, I want to darken colors on a photo to make a person appear to be injured. I’m not quite sure how to blend the colors. I’ve tried just subtracting RGB values to darken it. I’ve tried to make the color go towards a shade of brown. They don’t look quite that realistic.

Any idea? What’s the C code for that? Thanks again!

gonzobrains

]]> By: mariospants http://www.nathanm.com/photoshop-blending-math/comment-page-1/#comment-139506 mariospants Sat, 06 Mar 2010 21:55:54 +0000 http://www.nathanm.com/photoshop-blending-math/#comment-139506 Awesome! Kudos for posting this, I was looking all over for these formulas and you're about the only one who has it all in one simple, concise location. Congratulations: you're a required resource! Awesome! Kudos for posting this, I was looking all over for these formulas and you’re about the only one who has it all in one simple, concise location. Congratulations: you’re a required resource!

]]> By: Burkhard http://www.nathanm.com/photoshop-blending-math/comment-page-1/#comment-138873 Burkhard Tue, 23 Feb 2010 18:15:44 +0000 http://www.nathanm.com/photoshop-blending-math/#comment-138873 Seems that Hue, Color, Saturation, Luminance blend modes in Photoshop use a color model different from HLS - Luminance is defined differently, using an approximation of visual brightness. Probably something like as 0.3 * Red + 0.59 * Green + 0.11 * Blue or the like, maybe even taking color profile information into account. Seems that Hue, Color, Saturation, Luminance blend modes in Photoshop use a color model different from HLS – Luminance is defined differently, using an approximation of visual brightness. Probably something like as 0.3 * Red + 0.59 * Green + 0.11 * Blue or the like, maybe even taking color profile information into account.

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