The IFF file format for graphic images on the Amiga is called FORM ILBM
(InterLeaved BitMap).  It follows a standard parsable IFF format.

 ILBM.BMHD BitMapHeader Chunk 
 Sample Hex Dump of an ILBM 
 Interpreting ILBMs 
 ILBM BODY Compression 
 Interpreting the Scan Line Data 
 Other ILBM Notes