Flickr says: You can upload images in most formats, but only JPEG, GIF (non-animated), and PNG are natively supported. Other formats will be converted to JPEG.

Photobucket says: Supported image file types include gif, jpg, jpeg, png, and bmp.

and the other leaving it alone.

.png files.

Thanks for the info.

See if one (or both) is different than the original.

in my post - it's an accurate depiction of the color of the flowers.

Some sites like to do that. Unfortuntely, doing so also makes theft easier.

It was making me a little bit more crazy than I already am.

I always use embedded color profile: “sRGB” which gives you the best consistency between web sites and browsers.

Go to this web site and plug in your picture URL to see which embedded color profile exists, if any. Some picture posting sites strip the embedded color profile for whatever reason:

http://regex.info/exif.cgi

Plug in this picture to see a picture with the "sRGB" profile:

The poster's flicker .jpg has 'ProPhoto RGB' color profile and the photobucket one has no color profile.

Lightroom suggests the ProPhoto RGB as giving the best performance in Lightroom.

For the web, sRBG is the most compatible because it's been around for so long, all browsers support it, and it's optimized for monitor viewing. For prints, other color profiles are better assuming your printer supports them.

Lightroom.

Unless you know everyone downstream of you is running that profile, you're better off with a different one - Adobe RGB is fine.

The first photo has an sRGB color profile and the second a ProPhoto RGB profile.

You can check this by using the Edit>Convert to Profile setting in Photoshop. My guess is that Photobucket is assigning a lowest common denominator profile for the great majority of web visitors.

I can clearly see the difference, but I am using a wide-gamut monitor.

it exports it in ProPhoto RGB profile. I have been leaving it at that in Photoshop (which is what I use to change the image size) so Photobucket has to be assigning the change to sRGB.

Thanks for the info...I appreciate it.

monitor. I have a HD UltraSharp monitor.

They look the same to me. On the iPad, at least. Maybe I'd see some difference on the real computer.

but there is a definite difference on my monitor. The first one is more lavender and the second one is what I would call hot pink.

Color space rendering is a two step process.
For example, Firefox gets it right while Microsoft's IE gets it partially right by only doing "step 1".

It looks much different on my PC. I'm using Chrome.