Generated PDF size jumped from 2.2 -> 8MB after upgrade to 53.3

[gnyers]

Last week I've updated my VENV to the latest WeasyPrint (v53.3) with pip. Suddenly the same document that used to be 2.2MB is now built as a 8.2.

I'm using:

$ weasyprint --version
WeasyPrint version 53.3

$ python --version
Python 3.6.12

$ head -2 /etc/os-release 
NAME="openSUSE Leap"
VERSION="15.2"

Unfortunately I don't exactly know the previous version that I've used, but I thing it was a v52.?

This example document is moderately heavy on PNG images.

[mpth]

Havent worked with earlier versions a lot but coming from wkhtmltopdf it seems images can blow up the file size quite a bit.

One sample HTML document got me a PDF with less than 5MB generated with wkhtmltopdf

With Weasyprint 53.3 I got a PDF >15MB with image optimization turned on.

Anything I can do to keep file size under control when many images are used in documents?

[liZe]

Hello,

If you can share some examples, we’d be happy to test and see what’s wrong. This problem is probably a duplicate of #1444, with PNG images transformed into JPEG2000, causing useless extra time and extra size.

[mpth]

@liZe can't share the document or the images but it is 31 small screenshots in PNG format (637 KB total file size) so it is probably related to #1444 👍

[liZe]

Let’s continue the discussion in #1444.