Offset Len Contents
24 4 height (draw units)
28 4 width
32 4 x DPI (90 for a normal square pixel mode)
36 4 y DPI
40 24 transformation matrix
64 4 length of JPEG data
68 embedded JPEG (strictly JFIF) file
padding to next word
Currently it seems that the 6 word transformation matrix is used only to scale the JPEG image and translate it from (0,0),(height,width) to the required position on the page. It is not known whether this object can contain JPEG data in any format other than a JFIF file.
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