I read some of the posts about PNG and PSD are better quality to save as an image to maintain the color and detail painted in Artrage. I found out PNG file is very big file size for posting to forum. Besides photoshop, (i don't have this program), is there any other free small program which I can reduce the file size of PNG and still maintain the color and details in the painting? I try to find and search PNG for similar posts but didn't have any result. Sorry if this has been addressed before. Thanks.