Bug 247410

Summary: Always blurred display with OpenStreetMap
Product: [Applications] marble Reporter: Alexey Charkov <alchark>
Component: generalAssignee: marble-bugs
Status: RESOLVED DUPLICATE    
Severity: wishlist CC: nienhueser
Priority: NOR    
Version: unspecified   
Target Milestone: 0.8 (KDE 4.3)   
Platform: Gentoo Packages   
OS: Linux   
Latest Commit: Version Fixed In:
Sentry Crash Report:
Attachments: Screenshot illustrating the problem

Description Alexey Charkov 2010-08-11 19:56:10 UTC
Created attachment 50024 [details]
Screenshot illustrating the problem

Version:           unspecified (using KDE 4.5.0) 
OS:                Linux

Even when using the Mercator projection for OpenStreetMap (which should not result in any geometric transformation of tiles), Marble displays a blurred map as if the tiles were geometrically transformed or resampled due to zoom level mismatches. An attached screenshot demonstrates the web-based Mapnik rendering side-by-side with Marble's rendering at a comparable zoom level.

Reproducible: Always

Steps to Reproduce:
Select Openstreetmap display with Mercator projection in Marble, compare the rendering to a similar zoom/area rendered by Mapnik at openstreetmap.org

Actual Results:  
Marble's rendering is consistently more blurred than the original Mapnik tiles.

Expected Results:  
Marble should try its best to display raster tiles pixel-exactly where possible (maybe by snapping to the optimal zoom levels).

OS: Linux (x86_64) release 2.6.35-gentoo-alchark-u3s
Compiler: x86_64-pc-linux-gnu-gcc
Comment 1 Dennis Nienhüser 2010-08-11 23:08:04 UTC
Yes, I totally agree. We're still looking for volunteers to improve the situation :-)

*** This bug has been marked as a duplicate of bug 199259 ***