Remember that as a container, pdf's can contain embedded jpg images at varying pixel densities...
Christians solution would be the better solution I think. On Tue, Jul 7, 2015 at 4:36 AM Joel Rees <joel.r...@gmail.com> wrote: > 2015/07/07 16:55 "Christian Mandel" <c.man...@gmx.net>: > > > > For this use case, > > Well, actually, even IM's default 72 px/in would have done my present job. > However, > > > I would suggest using the pdfimages program (from xpdf I guess) > > (with the -j option to preserve embedded jpg) to extract the original > images. > > this is all useful information. > > > 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 > > Thanks. > > > > > 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. > >> _______________________________________________ > >> gimp-user-list mailing list > >> List address: gimp-user-list@gnome.org > >> List membership: https://mail.gnome.org/mailman/listinfo/gimp-user-list > >> List archives: https://mail.gnome.org/archives/gimp-user-list > >> > > > > > > _______________________________________________ > > gimp-user-list mailing list > > List address: gimp-user-list@gnome.org > > List membership: https://mail.gnome.org/mailman/listinfo/gimp-user-list > > List archives: https://mail.gnome.org/archives/gimp-user-list > _______________________________________________ > gimp-user-list mailing list > List address: gimp-user-list@gnome.org > List membership: https://mail.gnome.org/mailman/listinfo/gimp-user-list > List archives: https://mail.gnome.org/archives/gimp-user-list > _______________________________________________ gimp-user-list mailing list List address: gimp-user-list@gnome.org List membership: https://mail.gnome.org/mailman/listinfo/gimp-user-list List archives: https://mail.gnome.org/archives/gimp-user-list
