Added the attached printfs. Here's the output:

** WARNING **: scanner.vala:1204: Scan completed with 1584 lines, expected 2250 
lines
allocated: data_length = 711000, height = 2250, width = 1264
shift_count: offset 711000 >= data_length 711000 (x = 1263, width = 1264)
simple-scan: malloc.c:2453: sYSMALLOc: Assertion `(old_top == (((mbinptr) 
(((char *) &((av)->bins[((1) - 1) * 2])) - __builtin_offsetof (struct 
malloc_chunk, fd)))) && old_size == 0) || ((unsigned long) (old_size) >= 
(unsigned long)((((__builtin_offsetof (struct malloc_chunk, fd_nextsize))+((2 * 
(sizeof(size_t))) - 1)) & ~((2 * (sizeof(size_t))) - 1))) && ((old_top)->size & 
0x1) && ((unsigned long)old_end & pagemask) == 0)' failed.
Aborted (core dumped)

This is a buffer overrun by one byte. You can see clearly that all the
other color depths (besides DeviceGray) add an extra byte to account for
this overflow. Only the DeviceGray one does not, adding one to the
data_length calculations for DeviceGray fixes the problem.

Please let me know if you want any other printfs or information in
specific places.

** Patch added: "Printfs"
   
https://bugs.launchpad.net/ubuntu/+source/simple-scan/+bug/664608/+attachment/2793651/+files/debug-printfs.patch

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https://bugs.launchpad.net/bugs/664608

Title:
  simple-scan crashes when saving to PDF

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