Bug 516071

Summary: Rendering error on certain zoom levels
Product: [Applications] okular Reporter: Emir SARI <emir_sari>
Component: PDF backendAssignee: Okular developers <okular-devel>
Status: CONFIRMED ---    
Severity: normal CC: kde
Priority: NOR    
Version First Reported In: 25.08.1   
Target Milestone: ---   
Platform: Microsoft Windows   
OS: Microsoft Windows   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:
Attachments: screenshot

Description Emir SARI 2026-02-16 06:23:54 UTC
Created attachment 189638 [details]
screenshot

Okular 25.08.1, Microsoft Store version (probably valid for other OS as well)

See screenshot. On zoom levels 200% and higher, colours are not properly displayed. When going higher zoom levels with 5% increments, it does not occur sometimes. Please compare the thumbnail and the actual render.
Comment 1 Sune Vuorela 2026-02-16 09:58:58 UTC
This is related to overprint. IF one disable overprint in the settings, it renders fine on all zoom levels.

The document (which I have received) does have HasVisibleOverprint = True
Comment 2 Sune Vuorela 2026-02-16 10:17:37 UTC
(In reply to Sune Vuorela from comment #1)
> This is related to overprint. IF one disable overprint in the settings, it
> renders fine on all zoom levels.
> 
> The document (which I have received) does have HasVisibleOverprint = True

I can share the document with specific developers if needed.