Re: [Gimp-user] Size of output files

[Alan Barnett <alansbarnett verizon net>]

I loaded the "output" pdf files back into GIMP, and I noticed a 
difference in the page size.

When I read in the "input" pdfs, GIMP lists the page size as ~ 8.5" x 
11" for both sets of files.  When I read the output pdf files back into 
GIMP, GIMP lists the same page size for the first set, but a page size 
of ~35" x 49" for the second (larger file) set.  Why does GIMP change 
the page size when it exports the second set, and how do I stop it?

On 02/27/2015 08:03 AM, Alan Barnett wrote:
> I'm using gimp to increase the contrast of scanned documents.  The 
> scanned images were combined into a multi-page pdf.  The images are 
> music scores; the originals are RGB, but only grayscale information is 
> important.
> I opened the input pdf as layers with a resolution of 300 dpi, changed 
> the brightness and contrast of each layer, and exported the images as 
> a .mng file.  I then used ImageMagick to convert the nmg back to .pdf 
> format.
>
> I've done this with two different sets of images.  For the first set 
> of images, the input .pdf files are about 2 Mb, and the output .mng 
> and .pdf are both about 4 Mb; the process increases the size of the 
> files by a factor of 2.
>
> For the second set of images, the input pdf files are about 5 MB, and 
> the output .mng and .pdf files are both about 45 MB, an increase of a 
> factor of 9!
>
> Any suggestions how to decrease the size of the output files? Any 
> ideas about why the large difference in the size increase between the 
> two sets of images.  (The first set were scanned by me on an EPSON 
> 1640SU scanner, the second set were scanned by someone else on a 
> scanner unknown to me.)
>
> Thanks in advance for any suggestions.
>
> Alan
>
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