Bug#514380: libpdf-api2-perl: corrupts certain PNMs when embedding them

[Jeff]

Investigating this, the corruption depends upon the geometry of the
image - it is possible to crop the image to a size that is not corrupted
in the PDF.

e.g. the pnm after this cropping option is not corrupted:

convert corrupt_no_compression.pnm -crop 790x400+500+900
corrupt_no_compression_cropped.pnm

but cropping only the width, the corruption is still there, but less:

convert corrupt_no_compression.pnm -crop 790x3506+500+0
corrupt_no_compression_cropped.pnm

equally, cropping only the height, the corruption is also still there,
in a similar magnitude to the original:

convert corrupt_no_compression.pnm -crop 2480x400+0+900
corrupt_no_compression_cropped.pnm

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