Author Topic: Lucide - GBM plugin - config FYI  (Read 123 times)

Dariusz Piatkowski

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Lucide - GBM plugin - config FYI
« on: May 31, 2026, 05:43:08 pm »
Everyone,

In case you happen to be using the supplied GBM plugin (for image scaling), by default the lugbm.cfg file is set to use the 'scaler=simple' setting...however, there are numerous other options one can pick, and while not all of them are documented in the supplied documentation, there are some decent web resources out there.

As I did that, I came across the following site => https://clouard.users.greyc.fr/Pantheon/experiments/rescaling/index-en.html that does a pretty nice job of illustrating the differences given actual up/down-scale samples.

Subsequently I've changed my config to use 'scaler=lanczos', which seems to have made a difference in terms of viewing various PDFs, as not all of them are true PDF text documents and many are image scans that were published as PDF doc.

Just thought I would share...likewise, if you have tried the remaining scalar options (catmullrom,blackman,kaiser) I'm curious what your results have been like.

Best to everyone in the meantime!

-Dariusz

Doug Bissett

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Re: Lucide - GBM plugin - config FYI
« Reply #1 on: May 31, 2026, 07:45:52 pm »
Interesting. I tried this on my newest machine, which has lots of memory, and is fast. Changing scaler doesn't seem to make much difference, but my eyes aren't all that good. Speed doesn't seem to matter.

HOWEVER, changing "progressive_render_pages="  from 2 to 4 does seem to help, a lot, when scrolling through a complicated document.

Thanks for sharing this.