No, there's no reason for you to go back to the JPG format unless you get complaints from others about how slowly the PNG images load. For example, I'm on dialup and still waiting for all the icons and images on this page to load because of the large sizes of both files. I don't actually need to see your pix to know what you're talking about, though.
The problem with ongoing changes to JPGs is that when you modify the same JPG over and over, it loses quality each time
you save it. I suspect that's what you're seeing in your sample. Although it might be a bit of a pain for you, here's what I suggest as a workaround:
Keep a copy of your original PNG image. Every time you want to make changes, save that image as a PNG with a different name. Also save a copy as a JPG, which is the one to upload.
Then, for the next edit, reload that extra PNG, make changes, and save again as a PNG and a JPG, and so on.
That way, you'll lose only a small amount of quality in each JPG. Does that make sense to you?
Another way to deal with the problem is to use a free graphics editor like Irfanview
or the GIMP
, both of which have layers capability. (At least I think
IV does.) Using the layers feature will allow you to save an image as a PNG with each set of changes on a different layer. You can then export/save it as a JPG, with the same results I mentioned above. Of course there's a learning curve involved with both programs, so if you want to stick with the simpler Paint program, it should still work for you.
Hope this helps!
Edited by Dialer, 19 January 2008 - 07:51 PM.