What is bitmap Formats.

Bitmaps are inescapable for photographs and are also used for color contours and a variety of color gradients. There is a long list of formats. Fortunately there exist comprehensive sets of tools for dealing with them, such as the NetPBM utilities, as well as freely available image editors such as GIMP. If the graphic consists of nothing but the bitmap, then it is relatively easy to deal with, and the main question is how to avoid getting a PS file that is enormous. In fact it may well be the best policy to ask coauthors if they are supplying photographs to supply the JPEG file itself. Then you can convert it to PS in your own rational way, rather than receiving a butchered file from someone else's attempt to convert.