Comments on: Color difference algorithm http://www.emanueleferonato.com/2009/08/28/color-differences-algorithm/ italian geek and PROgrammer Fri, 10 Feb 2012 12:12:29 +0000 hourly 1 http://wordpress.org/?v= By: Anthony Thyssen http://www.emanueleferonato.com/2009/08/28/color-differences-algorithm/#comment-971944 Anthony Thyssen Fri, 21 Oct 2011 02:51:03 +0000 http://www.emanueleferonato.com/?p=1582#comment-971944 You do not explain of the in put RGB values are linear RGB, sRGB or RGB with a 2.2 gamma. You formulas seems to assume linear RGB, but typical (non-mathematical) images are more usually sRGB. The difference is important and quite massive! You do not explain of the in put RGB values are linear RGB, sRGB or RGB with a 2.2 gamma.
You formulas seems to assume linear RGB, but typical (non-mathematical) images are more usually sRGB. The difference is important and quite massive!

]]> By: sabr http://www.emanueleferonato.com/2009/08/28/color-differences-algorithm/#comment-931266 sabr Wed, 14 Sep 2011 09:52:09 +0000 http://www.emanueleferonato.com/?p=1582#comment-931266 In fact, In RGB 2 XYZ, I don't understand why we have to adjust values before applying the matrix ? Could someone explain me ? In fact, In RGB 2 XYZ, I don’t understand why we have to adjust values before applying the matrix ?
Could someone explain me ?

]]> By: sabr http://www.emanueleferonato.com/2009/08/28/color-differences-algorithm/#comment-929354 sabr Mon, 12 Sep 2011 14:16:11 +0000 http://www.emanueleferonato.com/?p=1582#comment-929354 I think the $z color is far less than that it would be ... Cordially. I think the $z color is far less than that it would be …
Cordially.

]]> By: Jon Rista http://www.emanueleferonato.com/2009/08/28/color-differences-algorithm/#comment-765610 Jon Rista Fri, 25 Feb 2011 21:04:19 +0000 http://www.emanueleferonato.com/?p=1582#comment-765610 Excellent article. Very helpful, especially to find some useful code examples that demonstrate these conversions. A question and a note. First, what white point did you use for your calculations? I know that Photoshop's color matching algorithms are balanced on a D50 white point. As for a simple note, I am doubtful that the difference between your final numbers and Photoshops are due to a white point difference. It looks like a simple rounding to me: 65.12 -> 65 (round down, valid), -37.39 -> -38 (round up, rather than round down, but that could be due to precision differences in the calculation), -4.54 -> -5 (round up, valid). Again, thanks for the example code. Excellent article. Very helpful, especially to find some useful code examples that demonstrate these conversions.

A question and a note. First, what white point did you use for your calculations? I know that Photoshop’s color matching algorithms are balanced on a D50 white point. As for a simple note, I am doubtful that the difference between your final numbers and Photoshops are due to a white point difference. It looks like a simple rounding to me: 65.12 -> 65 (round down, valid), -37.39 -> -38 (round up, rather than round down, but that could be due to precision differences in the calculation), -4.54 -> -5 (round up, valid).

Again, thanks for the example code.

]]> By: pic2col – extract color schemes from a picture : Emanuele Feronato http://www.emanueleferonato.com/2009/08/28/color-differences-algorithm/#comment-498045 pic2col – extract color schemes from a picture : Emanuele Feronato Fri, 11 Sep 2009 10:56:52 +0000 http://www.emanueleferonato.com/?p=1582#comment-498045 [...] wondered the point in calculating color distance at Color difference algorithm and Color difference algorithm – part [...] [...] wondered the point in calculating color distance at Color difference algorithm and Color difference algorithm – part [...]

]]> By: Color difference algorithm – part 2 : Emanuele Feronato http://www.emanueleferonato.com/2009/08/28/color-differences-algorithm/#comment-496831 Color difference algorithm – part 2 : Emanuele Feronato Tue, 08 Sep 2009 15:24:22 +0000 http://www.emanueleferonato.com/?p=1582#comment-496831 [...] I am turning the scripts explained at Color difference algorithm into functions, this way: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 [...] [...] I am turning the scripts explained at Color difference algorithm into functions, this way: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 [...]

]]> By: Weekly Shared Items – 1. September, 2009 | TOXIN LABS - weblog of a german design student from wuerzburg http://www.emanueleferonato.com/2009/08/28/color-differences-algorithm/#comment-493479 Weekly Shared Items – 1. September, 2009 | TOXIN LABS - weblog of a german design student from wuerzburg Tue, 01 Sep 2009 04:04:54 +0000 http://www.emanueleferonato.com/?p=1582#comment-493479 [...] Color difference algorithm [...] [...] Color difference algorithm [...]

]]> By: Monkios http://www.emanueleferonato.com/2009/08/28/color-differences-algorithm/#comment-493155 Monkios Mon, 31 Aug 2009 14:17:43 +0000 http://www.emanueleferonato.com/?p=1582#comment-493155 Nice article. Pretty usefull in understanding color models. Just saying but ... you could use more functions. Nice article. Pretty usefull in understanding color models.

Just saying but … you could use more functions.

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