Looking at the final image on my computer looks totally different from the way the image looks after I upload it to the image host.
Here's a tip on how to deal with this problem.
In Photoshop, go to
File -->
Save For Web. In the resulting window look for a small globe icon at the bottom right. When you click it, you open the preview image in your default web browser. That way, you will see what your JPEG will look like on the net - even before you save it in Photoshop.
In case of transparent GIF images, you can check their appearance on any background you choose in the same Save For Web window. Just look for a small triangle to the right of the
Preset drop-down menu. Click on it and choose
Background. Then, click the
Image option. This will allow you to open the file you intend to use as a background for your transparent GIF.
And remember my previous tip about saving your JPEGs in the
sRGB color space...