Re: [Gimp-user] resolution, size when extracting from pdf vs. imagemagick

[Christian Mandel <c mandel gmx net>]

For this use case, I would suggest using the pdfimages program (from 
xpdf I guess) (with the -j option to preserve embedded jpg) to extract 
the original images. The import in gimp will always "render" the pdf, 
what will always scale the original image, unless you hit the exact 
resoultion/size. Even then some quality will be lost since the pixel 
data from the rendered image will be taken and not the original 
information. IIRC, neither IM nor Gimp will look into the pdf 
"container" to check the original jpeg's resolution, they assume a 
default resolution which you can change as Pat suggests.

Best regards

Chris


Am 07.07.2015 um 09:00 schrieb Joel Rees:
> I have a pdf of scanned images, theoretically jpeg images, and the gimp
> will offer me a selection dialog, from which it will import them
> individually as 1304x932 at 100 px/in. (This is odd, because I selected
> 300dpi at scan time, so the images should be 3 times that pixel density.
> But, then, 22Mb for 36 images is not 13" x 9" at 300 dpi, unless heavily
> compressed.)
>
> ImageMagick's identify -verbose tells me the same are 1032x728 at 72 dpi.
> If I use ImageMagick's convert to extract them, that's how they end up.
>
> Anyone have an idea what's happening?
>
> Joel Rees
>
> Computer memory is just fancy paper,
> CPUs just fancy pens.
> All is a stream of text
> flowing from the past into the future.
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