Hello, Andreas,
First of all, I am trying to figure out whether your issue is related to the image colour profiles or the JPEG quality. What level of JPEG quality have you set in your plugin settings?
When I put the original and the resized image side by side, I do not really see a problem with the “reds”, but I do see some indications which are similar to what happens when the JPEG quality is too low: http://prntscr.com/cowt4n/.
Also, do you have any other images with the same issues that you can point me to?
In the background, what the plugin does is to use the PHP GD library image processing facility, so I am afraid there will not be much we can do. But let’s take it one step at a time!
Cheers,
Takis
Hello Takis,
first of all thanks a lot for the quick reply!
The JPEG quality is set to 100 and sharpening is also activated.
I’m using a hardware calibrated EIZO monitor but I clearly see the difference in color on my Mac Book Air, too.
Here’s another example even though it’s not as much of difference here.
Original: http://andreas-mass.com/wp-content/uploads/2016/02/cliff_house_04.jpg
Resized by plugin: http://andreas-mass.com/wp-content/uploads/2016/02/cliff_house_04-1000×1496.jpg
If you didn’t see a difference in color in my first example then you probably won’t see one in this one. I can only assume that you don’t have color management activated in your browser. http://ntown.at/de/2013/12/28/firefox-color-management/ When I deactivate color management I also don’t see any difference. When I open the images on my Mac via the normal finder I also don’t see any difference because it doesn’t read the embedded profiles.
Fact is: When I open the images in photoshop the original still has a color profile (which is quite important tbh to ensure correct color interpretation by each device) and the resized version has the profile removed.
If there is no way to implement the color profiles I guess I will have to ditch the plugin or edit all of my images by removing the color profile and adjusting the color of each image.
This article is even more helpful and explains perfectly why embedded color profiles are important.
http://www.color-management-guide.com/web-browser-color-management.html
I’m using Firefox and the interesting thing is that the default setting for color management at “gfx.color_management.mode” is “2”. When I set it to “1” even the version without color profile is viewed correctly because “1” means that any image without a color profile will be interpreted as having an sRGB profile. But because the default setting is “2” Firefox doesn’t really know what to do with images without color profiles. Hence I’d love to see the plugin keep color profiles because they define and help browsers across all platforms understand how to view an image (except those that still don’t have color management implemented).
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This reply was modified 9 years, 8 months ago by
3damass.
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This reply was modified 9 years, 8 months ago by 3damass.
Hello, my friend,
Thank you for the very interesting info. There are some nice bits in it that I was not aware of!
Perhaps I do have a differently calibrated screen or my browser is not set to use colour profiles. However, it seems that the PHP GD library indeed does not support image colour profiles (at least not yet). This is an issue spotted quite some years now. If I got it right you can read about it here https://bugs.php.net/bug.php?id=53598.
The truth is that I have to use the PHP GD library because it is definitely more standard than the most advanced ImageMagick, which could handle colour profiles a lot more efficiently.
If the current issue is indeed of importance to you, then I am afraid you only have two options, just as you said: 1) stop using the plugin, which would make me really sad and 2) remove the colour profile from images altogether before uploading them to WordPress. I would be very reluctant to insist on number 2, but you should probably have the exact same issues with any image processing that WordPress does when creating thumbnails. Of course this is true only for thumbnails and not for the original uploaded images!
I am very sorry I cannot do much more at the time. Seems that we are going to have to choose our compromise here.
Let me know if I can help you with anything more!
Cheers,
Takis
