Color shift in uploaded image

[Llaves]

I uploaded serval images and was surprised to see that the colors were noticeably different when viewed in the gallery than the local copy on my disk. I'm using the same monitor in both cases. The colors are more saturated when viewed in the gallery. This seems to happen pretty consistently. Is there a setting I need to adjust?

[ildyria]

I uploaded serval images and was surprised to see that the colors were noticeably different when viewed in the gallery than the local copy on my disk. I'm using the same monitor in both cases. The colors are more saturated when viewed in the gallery. This seems to happen pretty consistently. Is there a setting I need to adjust?

• Are you uploading is sRGB ?
• If you open the original (via Lychee), do you notice a difference ?

I believe that there resizing is making the pictures bit punchier, however, I am not able to figure out why. :(

We are using Imagick:
https://github.com/LycheeOrg/Lychee/blob/master/app/Image/SizeVariantDefaultFactory.php#L188
https://github.com/LycheeOrg/Lychee/blob/master/app/Image/Handlers/ImagickHandler.php#L160

Seems there are some magick happening in the background (here comparison GD - imagick, I wouldn't be surprised that some profile are creating issues or the scaling...)
https://stackoverflow.com/questions/5773032/how-to-stop-gd2-from-washing-away-the-colors-upon-resizing-images

[Llaves]

I'm using sRGB.

If you open the original (via Lychee), do you notice a difference ?
By original, do you mean the image I see when clicking the thumbnail? This was interesting. The images I've uploaded are bigger than the full-screen/slidehow images, so even those were resized with ImageMagick. I resized one of my images before uploading so that the "full-size" image would not require resizing. In this case, the thumbnail still had "punchier" colors.

The short-term solution is not to upload images larger than 1920 x 1080 (that appears to be the default resize for oversized images - I didn't look a the code).. While this won't fix the issue on thumbnails, it will leave the full-size images intact.

I don't really read .php, but it appears that you are preserving the colorspace after doing the -strip to remove metadata. From what I've read, imageMagick does some sort of gamma correction on resizing. You can override this by specifying a gamma value or explicitly doing the correction (which I don't pretend to understand).

[Llaves]

I've continued to poke at this and discovered something interesting/odd. If I upload an image, the thumbnail and the image displayed clicking on the thumbnail both show intensified colors. If I click on the full-screen display button, the image shows correct colors. Even more baffling, if I click on the thumbnail, then right-click "save image" on the resulting image, the saved image shows correct colors even though the image I clicked on has intensified colors.

[ildyria]

if I click on the thumbnail, then right-click "save image" on the resulting image, the saved image shows correct colors even though the image I clicked on has intensified colors.

That one is very surprising. I assume by "save image" you mean the browser one, not the download which grants you the image.

If I click on the full-screen display button, the image shows correct colors

You might be seeing the original, you can check the url for double checking that.

[Llaves]

yes, I mean the browser command "Save Image" in the context menu

News Flash!
I just checked in Chrome and the problem does NOT appear. It does not appear in MS Edge. It does not appear in Safari on my iPhone. This is a Firefox issue. Why is beyond me.