[Gimp-user] Open PDFs, keep original clarity

[rich404 <forums gimpusers com>]

> I have 12 PDFs of pictures of a map. I want to use GIMP or any other
> program to stitch the pictures together.
>
> When I open the PDFs in GIMP, the pictures have bad enough clarity
> that I cannot read the words in the pictures anymore. I need to be
> able to read the words in the pictures so that the map is usable.
>
> I want to bring the PDFs into GIMP, or another program that I can use
> in Linux, to stitch them together. I want the clarity of the pictures
> to be high quality and file size is not an issue.
>
> How do I do this?
>
> Bruce

Typically a PDF that is a wrapper for a graphic uses 300 pixels-per-inch (ppi)
for the graphic. But not always try and see.

Gimp default for importing a PDF is 100 ppi see: example 1: 

Increase that value to 300 ppi for better but larger sized image in pixels. Gimp
is a raster editor and works in pixels. example 2:

When it comes to stitching together, 12 images might be a chore, depends on the
image sizes, lots of layers = large use of computer memory. Try stitching
together images  of separate rows, then use those images to combine as columns.

Alternatives to Gimp: If there are decent overlaps there is Hugin and for those
very large mosaics, Nip2 (not recommended for beginners). I believe the MS one
that is free is not bad, never used it.

rich: www.gimp-forum.net

Attachments:
* http://www.gimpusers.com/system/attachments/957/original/01-pdf.jpg
* http://www.gimpusers.com/system/attachments/958/original/02-pdf.jpg

-- 
rich404 (via www.gimpusers.com/forums)