621498 - Incorrect (darker) colors in images & canvas

Status: UNCONFIRMED

(Firefox :: General, defect)

Description

[Aleksejs]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/534.15 (KHTML, like Gecko) Chrome/10.0.612.3 Safari/534.15
Build Identifier: Firefox 4.0 Beta 8

So, I've tried opening png image (http://popoffka.ru/foxbug/wall.png) in Firefox and loading it into canvas (http://popoffka.ru/foxbug/index.html). Even though I though it will load OK, it loads with incorrect colors. Colors of the pixels are just slightly darker than the ones in the original picture.
Here's a picture that will explain everything: http://popoffka.ru/foxbug/screen.png
(however, there are some mistakes in it :
1. I meant beta 8, not beta 7
2. it not only happens in canvas, but also when just opening pictures with Firefox
3. the pictures were resized just for illustrational purposes)

Reproducible: Always

Steps to Reproduce:
1. Load http://popoffka.ru/foxbug/index.html or http://popoffka.ru/foxbug/wall.png with Firefox 4.0 Beta 8
2. Screenshot it
3. Use colorpicker in Paint.NET (or any other graphical editor) to find out the color of pixel 2;2 on the picture
Actual Results:  
The color is #B97609

Expected Results:  
The color should be #C67308
(checked by Pain.NET & Google Chrome 10)

I haven't used any themes or addons. My computer's configuration is following:
Intel Core 2 Duo 6600 @ 2.40 GHz
2 GB of RAM
NVIDIA GeForce 8600 GT 256MB
Windows 7 Ultimate 32-bit

This doesn't happen in Firefox 3.5 for me.

Comment 1

[Jo Hermans]

That's probably the color-correction that is happening. Firefox uses the color profile from your display to correct the colors. But i don't know of any change in that part of the code after 3.5.

Can you retest with the preference gfx.color_management.mode (type about:config in the location bar, and then search for gfx.color) set to 0 ? The default both in Firefox 3.5 and 4.0 is 2.

Comment 2

[Christian Hammond]

I'm experiencing the same issue with a small sprite editor script I've put together. Obviously that creates some problems.

When I have gfx.color_management.mode to 1, I see the darker colors. When I have it set to either 0 or 2, it works fine.

This appears to be in violation of the Canvas spec's section on color correction. I imagine this particular combination isn't encountered as often. Since 1 means it's trying to color-correct everything, I'm guessing it's trying to color-correct an already color-corrected image when doing canvas.drawImage?