Unless something comes up, I’m done with the color space conversion accuracy work. I’ll use this post to summarize what I’ve found over the last couple of weeks and link to the posts with the details. The first conclusion is that, using 16-bit precision, for all colors within the gamut of both the source and… [Read More]
Search Results for: color space conversion
Comparing Photoshop and algorithmic color space conversion errors
I took my 256 megapixel image that’s been filled with random 16-bit entries with uniform probability density function, brought it into Photoshop, assigned it the sRGB profile, converted it to Adobe (1998) RGB and wrote it out. I went back to the sRGB image, converted it to ProPhoto RGB, and wrote that out. Then I… [Read More]
Chained color space conversion errors with many rgb color spaces
[Note: this post has been extensively rewritten to correct erroneous results that arose from not performing adequate gamut-mapping operations to make sure the test image was representable within the gamut of all the tested working spaces.] I’ve been trying to come up with a really tough test for color space conversion testing, one that, if… [Read More]
Sequential color space conversions at varying precision
I am now spreading my color space net to include a wide variety of possible RGB working color spaces. I picked 13 for testing: IEC 61966-2-1:1999 sRGB Adobe (1998) RGB Beta RGB Bruce RGB CIE RGB ColorMatch RGB Don-4 RGB ECI RGB v2 Joe Holmes’ Ektaspace PS5 PAL/SECAM RGB ProPhoto RGB SMPTE-C RGB Wide Gamut… [Read More]
Color space conversion errors with ProPhoto RGB — 15 bits
Now let’s look at ProPhotoRGB conversion errors with 15-bit quantization. I took all 16+ million colors in sRGB and converted them to PPRGB and back, quantizing to 15-bits per color plane after each conversion. The conversions themselves were performed algorithmically (no tables involved) with double precision floating point, and have errors on the order of… [Read More]
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