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docs/PBM.asc

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+NOTE(m): Copied from https://github.com/svanderburg/libilbm/blob/master/doc/additions/PBM.asc
+
+Apparently, The PC version of Deluxe Paint stores images in a slightly different
+format compared to the Amiga version of the Deluxe Paint. After doing some
+experiments, I have discovered the following differences:
+
+- The IFF form type used is: 'PBM ' instead of 'ILBM'.
+
+- As PC hardware does not know anything about bitplanes, its BODY uses chunky
+  format, in which every byte represents a pixel.
+
+- Interleaving scanlines is to smoothly render planar graphics data on an Amiga,
+  so that no visual corruption is visible while calculating the index values of
+  each pixel. On the PC this is not necessary, so we don't have to interleave or
+  deinterleave anything.
+
+- Some Amiga specific chunks, such as CAMG are not used.
+
+Sander van der Burg