Take a look at this image on nasa.gov. The text in the image is yellow, the flight paths are white, and Neptune's orbit is green.
When I try to use the SE image uploader to include the image in a question, the colors change, as you can see here:
The text has turned green, the flight paths are blue, and Neptune's orbit is light blue. Every color changed, actually.
When I uploaded the image directly to imgur.com, the colors did not change.
Why is the SE image uploader changing the colors of this image?
Note: This happens for me with Firefox 39 on both Windows XP and Mac OS X 10.7.5. It also happens in Safari 6.0.2 on OS X.
It seems to do this even if uploaded from your computer:
(FF 39 for OSX)
Linked from URL:
BUT, if you direct link using the alt code rather than uploading to the servers, it's fine:
It's my fault... I accept it openly... /me runs away in shame... Sorry about this mess up.
Here is what happened. I hit save instead of cancel in the Pixlr tool which I used for checking res and it got uploaded in Chrome and FF (hires). But later when using Safari I downloaded fresh image, removed all the old ones from my download folder & uploaded it and you can see it's has problem.
Catija & Damkerng T. answers are correct.
Works for me in Google Chrome and Firefox but not in Safari. I just downloaded the image from the direct link and re-uploaded it.
Tech-specs: (just in case needed)
Google Chrome Version 43.0.2357.134 (64-bit)
MacBook Pro (Retina, 13-inch, Late2013) - OS X Yosemite version 10.10.2
Here is the image:
Here is how Safari Browser Upload looks:
I still don't have a conclusive answer, but this should give enough hints.
After a quick inspection of the two files (original: http://www.nasa.gov/sites/default/files/739459main_acd97-0036-2.jpg, SE's: http://i.stack.imgur.com/iVZTk.jpg), I can see one obvious thing: the EXIF information was stripped out of the SE's version entirely. EXIF tags include several crucial things that may affect how the image will be rendered. Among these are things like WhitePoint, PrimaryChromaticities, ColorMap, WhiteBalance, and ColorSpace. And that is the cause of the problem, IMHO, though I'm not quite sure why and how the EXIF information removal happens when we upload an image.
Anyway, here is my simple workaround: save such an image as PNG first, then upload it. Here is my test result: