Re: [Gimp-user] Extracting images from a PDF

[Dwain Alford <rteest53 gmail com>]

On Sun, Sep 15, 2019 at 5:11 AM rich404 <forums gimpusers com> wrote:

> There are some things to remember for a PDF.
>
> It is a 'finished' format meant for viewing or printing. The document
> size, A4 ,
> US Letter...is a property.  For printing pixels-per-inch (ppi aka dpi) has
> an
> effect but not always an easy way to determine the original size. see
> screenshot
> https://i.imgur.com/g8IP95S.jpg Scanned documents in particular can have
> various
> original ppi.
>
> A PDF document can be in forms, vectors  or a bitmap ( say a scanned
> image) or a
> mix,  image a bitmap + text.


also, a pdf is an "image" of the original document. adobe created the
format as a universal document format to be shared and the recipient did
not have to have the program(s) used to create the document (i.e. ms office
or libreoffice). so a pdf is like the johnny cash song about working in a
cadillac plant and building his caddy over the years with the different
year parts. i guess you could say that it's a faux page layout program
similar ti scribus, indesign, quarkexpress, etc.

hope this helps

>

On Sun, Sep 15, 2019 at 5:11 AM rich404 <forums gimpusers com> wrote:

> > Hello. I am Carlos and its my first question to this board, wich i
> > think it will
> > be great because it´s so great as the articles and tutorials and
> > downloads i am
> > watching ...
> >
> > The thing is...
> > When i open a PDF file, and extracting the images and saving the
> > images...
> > 1) wich one should I choose? Open in layers, or image?
> > 2) is there a way to save/export the image in the size of the pdf?
> > because i saw
> > there is a default size (width and height) wich is saved, but u can
> > edit that
> > size ... so ---
> > My question basically is : when i go to file / export it have specific
> > size (the
> > image to be exported). Is that size the original quality from PDF, or
> > it is the
> > default from gimp?
> >
> > Thank you and i wish you understood my question.
>
> There are some things to remember for a PDF.
>
> It is a 'finished' format meant for viewing or printing. The document
> size, A4 ,
> US Letter...is a property.  For printing pixels-per-inch (ppi aka dpi) has
> an
> effect but not always an easy way to determine the original size. see
> screenshot
> https://i.imgur.com/g8IP95S.jpg Scanned documents in particular can have
> various
> original ppi.
>
> A PDF document can be in forms, vectors  or a bitmap ( say a scanned
> image) or a
> mix,  image a bitmap + text.
>
> Gimp is not always the best tool, It might be possible to open in some
> other
> application and copy an image "as original" to Gimp . This example using
> LibreOffice https://i.imgur.com/a9N3Mtx.jpg but not if the document comes
> from a
> scan.
>
> Gimp is a bitmap editor. Open a PDF in Gimp and it is converted to 100%
> bitmap
> regardless of original format.
>
> Open a PDF in Gimp and the default ppi is 100. For quality, change this to
> 300
> ppi. Only need a specific page? Then select just that page. screenshot:
> https://i.imgur.com/OH5Sw2s.jpg
>
> Then use the rectangular select tool, position and size over the image,
> Edit ->
> Copy for the contents. Edit -> Paste-As -> New image. Export that as
> required.
>
> Not the same size in pixels as an extracted image? All depends on the ppi.
>
> --
> rich404 (via www.gimpusers.com/forums)
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