All I can say is that I can't re-create this issue from here, and everything is working as expected. Are you sure all the images you uploaded were in the SAME color space originally? The upload resizer will never change the colors of an image that is already in sRGB. Here are my tests, working as expected, and I would be shocked to see anything else to be honest (since the source is in sRGB).
Here is the original image uploaded with resizer OFF. It's identical to the image you gave me of course:
Here is the same image uploaded in X3 with resizer ON (2560 px).
To emphasize that they are same color, I put them in the X3 comparison plugin:
I could test directly on your website, but there is no reason to expect the result to be different as the upload-resizer is not a server mechanism, but done in browser. If I cannot recreate the issue, it's hard for me to give an exact answer. However, at this point, I can only conclude one of the following:
- Somehow, for some reason, you have uploaded a NON-sRGB image in your tests. In this case, depending on several factors (browser, profile, screen, uploader), it may very well be that colors changed.
- The only other option, is that your browser is for some reason changing the colors on resize (it's the browser that actually resized the images on upload-resize). How else would it work here and not for you? I have never heard of this though, as long as the source is sRGB.
Some browser plugin? Unlikely, but gotta eliminate. You can definitely narrow the issue down to TWO cases 1) WITHOUT upload-resizer enabled and 2) WITH upload-resizer enabled. In my case, I have tried both, and the images are the same.
For the sake of being exact, I also compared my results to the first two images on your website. Indeed, as you stated, the first image BEC 3489 2a is clearly very pale. The second image, as you have stated, is OK. The image uploaded from here in X3 resizer has identical colors as your correct image:
Your correct image, without resizer:
My uploaded image, with resizer 2560 px:
That must mean 100% that
either #A The source you have provided is not the same color profile as the original source you used in all your tests, or
#B Your browser changes colors of the image when resizing, but not mine.