Because Facebook strips off all of the EXIF data from uploaded photos - including your color profile information, which may leave your images looking reddish, under-saturated, etc.
Here’s what you can do to make sure your photos look acceptable on Facebook.
Note: You can upload an image up to 2 megapixels in size. I don’t recommend doing this.
Images aren’t going to look as good as you might want on Facebook, and you get very little control of your images, so why put your large images where they’re not being displayed at their best?
Put your big images somewhere else where you will get the quality, control, and flexibility you want.
I griped about Facebook allowing large image uploads and downloads a while back. And now, you can print Facebook photos at your local Target.
Now, this is nice for the average user, but is a slap for any professional photographer.
Special thanks to Target, Facebook, and KODAK (who you’d think would have a clue) for saying to hell with your copyrights and allowing people to take and print images without your consent.
Imagine if these were mp3s. One could walk into a target store and they’d burn a professional quality CD of your music, and not pay you a dime. It’s the same basic idea. (Sharing an mp3 for personal use is fine. printing a new professional quality CD is another. And, at any rate, there’s a shorter distance from an image to a final print than there is from an mp3 to a CD)
I would like Facebook to acknowledge that some of us are professionals. And, as such, would like to at least attempt to make a living off of our work. (Just because we enjoy it, doesn’t mean that it isn’t work.)
At the very least, give us some way to post our wishes - a location for a license that appears next to images, for example. Just give us some sort of official “Please respect the photographer’s copyrights” notice, rather than the current “do whatever you want” stance.
So, again, the only thing I can do is to not post photos, or to post ones that are low enough quality (and/or watermarked) that printing doesn’t come out well.