Comments on: Premio Unicef de fotografía

by: Ueda

Fri, 26 Apr 2013 17:48:19 +0200

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by: car insurance quotes

Thu, 09 May 2013 12:50:39 +0200

A couple of people have asked me what’s going on here. The top image is in the Kodak ProPhotoRGB color space, which is so immense that the “blue” and “green” primaries aren’t even physically-realizable colors. If your web browser just takes the RGB values in that image and feeds them to your display, the colors will be unrealistically desaturated. The bottom image is in the sRGB color space, which was created to approximate the typical performance of a mid-90s cathode-ray-tube computer display. If your web browser is not color managed and you have a wide-gamut display, the colors will appear oversaturated unless your OS simulates some other display for unmanaged apps. If you have a typical desktop LCD, the colors should appear about right. If you have a laptop, the colors could be nearly right, or desaturated, depending on power and cost tradeoffs made by the people who designed the display subsystem.A final point for those of you who know color management. The color transformation was made in Photoshop, using the ACE color engine (I think ACE stands for Adobe Color Engine, so ACE color engine is redundant, like PIN number or ABS system). The original image was the sRGB image, and ProPhotoRGB can represent any color in that space, so there’s no gamut mapping going on. The transformation was made using the relative colorimetric rendering intent, so the fact that the white point of sRGB is D65 and that of ProPhotoRGB is D50 has been compensated for, at least within the capabilities of the ACE engine. There are many ways to do white point correction, and none are perfect, but the images appear identical to me in Photoshop and on color-managed browsers.As an aside, if you try this at home and decide that you’d like to see what the sRGB image looks like in ProPhotoRGB without making the white point correction, you’d think that you could see that by doing the conversion with the rendering intent set to absolute colorimetric. You’d be wrong. Adobe has decided that you couldn’t possibly mean that, and will change the white point anyway. It probably cuts down on support calls, but it seems strange to me.

by: car insurance quotes

Mon, 13 May 2013 08:30:49 +0200

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