[Gambas-user] How to reduce the size of PDFs generated with PDFSurface/Cairo

[Claus Dietrich]

Hi Fabien and Voutt

Am 10.10.23 um 10:00 schrieb Fabien Bodard:
> I use this old class in my project to generate simple picture pdf.
>

Am 10.10.23 um 13:04 schrieb vuott--- via User:
> Ehmmm...I got this simple and short code by using GhostScript external 
> resources:

Thanks a lot for sharing your solutions. I put both into my treasure 
box. They provided me with the confidence that I am not on the wrong 
track. The PDFWriter class is a real PDF "killer class". Its scope of 
capabilities is amazing and worth a very detailed look. Voutt's solution 
is actually doing what I needed in my program. It does the same as my 
single line Shell command. Here an example of my Shell command for a PDF 
scanned with 300 dpi (A4 size) converted to 150dpi (=/ebook):

gs -dBATCH -dNOPAUSE -q -dDEVICEWIDTHPOINTS=595 -dDEVICEHEIGHTPOINTS=842 
-sDEVICE=pdfwrite -dPDFSETTINGS=/ebook -sOutputFile=outputpath.pdf 
inputpath.pdf

All relevant parameters (width, height, resolution, input.pdf-path, 
output.pdf-path) can of course be inserted by a Subst command.

Best regards

Claus