Re: Maps available
You can use lossless formats, like lossless JPG or PNG. But never use lossy compression on an image where non-visual data is stored in the image file. Lossless formats do not compress nearly as well as lossy ones, of course.
The freeware program IrfanView can interconvert all common graphics formats, and you can specify quality on lossy formats. It is the best freeware program I have ever used.
-Cherry
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