The current PDL::IO::Pic is based on the NetBPM converters to and from PNM formats.
The existing implementation does not appear to support multi-image PNM files
which would be very useful for data pipelines and multi-image TIFF conversions.
A first implementation would be to simply extend the existing rpnm/wpnm
routines to take an already open handle instead of a file as input. Then it
would be possible to read or write to a pipe the sequence of PNM images.
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