Edit report at http://bugs.php.net/bug.php?id=53598&edit=1
ID: 53598 Updated by: paj...@php.net Reported by: the-ninth at gmx dot com Summary: GD does not support color profiles -Status: Assigned +Status: Feedback Type: Feature/Change Request Package: GD related Operating System: Irrelevant PHP Version: Irrelevant Assigned To: pajoye Block user comment: N Private report: N New Comment: Can you restore the links please? 404 now Previous Comments: ------------------------------------------------------------------------ [2010-12-24 01:11:27] the-ninth at gmx dot com Hi, Try this one: http://www.the-ninth.com/demo/demo_php_argb.jpg http://www.the-ninth.com/demo/demo_lightroom_argb.jpg It was generated in AdobeRGB color space and the profile was removed during resizing. I assume that your Firefox should display it differently, because for the one from Lightroom it knows that it is AdobeRGB while for the one from PHP/GD it will fall back to sRGB. But in any case, the essence is that color profiles are a part of images and at least some current browsers rely on this information. At the moment it is FF and Safari, and IE9 will have color-management too. Then the problem will affect the majority of users. So for the future it would be really helpful if GD would allow to read/write color profiles. Cheers, Robert ------------------------------------------------------------------------ [2010-12-23 15:52:56] paj...@php.net I think I need more visible differences as I don't have a calibration system in place nor a calibrated monitor :P I will already analyze the delta in the meta information of both images. ------------------------------------------------------------------------ [2010-12-23 15:45:06] the-ninth at gmx dot com Hi, Check these two pictures: http://www.the-ninth.com/demo/demo_php.jpg http://www.the-ninth.com/demo/demo_lightroom.jpg demo_lightroom.jpg was generated by Adobe Lightroom and contains the profile. Demo.php was generated by GD and does not contain the profile. To see the difference you need to have a system color profile that is different from sRGB, like you would have with a calibrated monitor. Then if you open them in Firefox you'll see the difference. I think Safari does color management too, so you might see the difference there as well. Maybe also IE9. If you do not have a calibrated monitor, then probably sRGB is the system default anyway, so in this case Firefox takes sRGB for the picture without the profile and the result is correct. Thanks, Robert ------------------------------------------------------------------------ [2010-12-23 15:37:47] paj...@php.net hi, Can you send me a couple of images with the profile(s) you are referring to please? ------------------------------------------------------------------------ [2010-12-23 12:49:13] the-ninth at gmx dot com Description: ------------ Hi, It seems that GD currently does not support embedding color profiles into JPEGs created with ImageJpeg(). The colors of the generated JPEG then look different from the ones in the original JPEG if the browser is color-management-capable and the system uses a different profile than was embedded in the original JPEG. For example, I have a large image generated by Adobe Lightroom, which has sRGB embedded as profile. The resized photo generated by GD has lost the profile. I am using Firefox and have a calibrated monitor, so the system does not use sRGB per default. In Firefox the resized picture has different colors then the original one. Only if I force Firefox to use sRGB by setting gfx.color_management.mode to 1, the picture looks the same as the original. But obviously I cannot expect this from my website's visitors. When researching this on the Web I found that many people have that problem but there is no solution in sight. ImageMagick is not an option for me, my hoster does not support it. It would be great if GD could be extended to allow embedding color profiles into images. Thanks, Robert ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/bug.php?id=53598&edit=1