Hi there.
I am probably way in over my head even posting in here. But maybe i get props for trying to learn. I am using GIMP to do some super basic prep for images of my art for online sales. Some images end up being drastically different colors from the original painting and photo file once uploaded into GIMP and then will also save that way when I export tifs as jpgs for web use. I know it's unlikely. But is there a trick or setting to disable that? Is there some basic thing I am missing? Can anyone explain to me what is happening or help me trouble shoot? Thanks so much!
I would love to preserve the original color as much as possible.

Thank you so much! This gave us some great starts to trouble shoot. Haven't completely solved the problem but have a much better idea why it's happening and some ideas of what to do.

If you are taking the photographs of your artwork then it is probably a hardware issue.

First, what is the format the camera uses? RAW or possibly jpeg. Going from RAW into Gimp involves a conversion with all sorts of tweaks where colours can be adjusted. Jpeg from a camera on the other hand is most likely RGB colour profile and not all colours are included. Look up color space

https://en.wikipedia.org/wiki/Color_space

A fix can be as simple as "auto white balance" in Gimp, but usually more is needed. You should take care about the lighting conditions when the photographs are taken. A bit of reading here:

http://www.cambridgeincolour.com/tutorials/white-balance.htm

Then the computer display. For best results the monitor should be calibrated. Monitors straight out-of-the-box will have their brightness set too high. There are simple ways to get sensible setting. see:

http://www.cambridgeincolour.com/tutorials/monitor-calibration.htm

However, all your potential customers will also have their monitors un-adjusted so they will get a wrong impression of your work whatever you do. Why not include a disclaimer on your web page.

rich: www.gimp-forum.net