02-18-2023, 08:39 AM
(This post was last modified: 02-18-2023, 08:54 AM by rich2005.
Edit Reason: typo
)
(02-17-2023, 02:23 PM)sedmont Wrote: So has the resolution gone down in the pdf?
No.
When you export an image to PDF in Gimp, all it does is embed that image in a PDF 'wrapper' The PDF only cares about the page size, which in Gimp comes from the ppi value.
You can have two seemingly identical PDF's . This one 3553x3949 pix @ 300 ppi print size about 300x330 mm
In a PDF viewer, again the size is about 300x330 mm but check the file size 9.0 MB Big image = big file size.
Then there is the same image, except now scaled down to 1185x1317 @ 100 ppi, print size still about 300x330
Now in the PDF viewer, page (paper) size still 300x330 but file size now 2.3 MB.
All Gimp has done is embed images. All the PDF sees is the paper size.
The smaller PDF will have worse quality in a viewer when zoomed in. When you open a PDF in Gimp the default ppi is 100. It is up to you to increase that value.
Truthfully, Gimp uses a very low internal compression for PDF, hence those large sizes. You can get smaller PDF sizes with other programs, for example: ImageMagick 4.5 MB <> Gimp 9.0 MB