Why is it that I edit a photo and adjust colours etc. in PhotoShop CS3, save it at maximum quality as a jpg then upload it on the internet, when it appears on here, or tumblr etc, the colours are slightly different?
Is it something that can be fixed, or is it just one of those things?
It may be due to "colour profiles" and is also definitely to do with the image being resized/resampled when it gets uploaded to a website, to save space. There's been a tonne of threads on this in the past, have a search for "colour profile" or "resampled" and you should find them :)
you need to be sure when you post to any website that the color profile is sRGB - with most dialog boxes for exports for email or websites there should be a box for that -- most of us shoot and edit in RGB as this gives us a larger range of colors which we need esp for printing shots but websites color profile is sRGB.
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Facebook is a nuisance for changing little things, every now and again a batch gets all softened...
Just downloaded one of my own direct from page... Missing but assigning sRGB caused no visible change there...
Though auto resizing/compression could be causing the changes just as easily, depending on how its managed...
See:
Non sRGB
and
sRGB