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"Paletted/Unique values" raster rendering is extremely slow using QGIS 3.34.4 / QGIS 3.36.0 #56652

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agiudiceandrea opened this issue Mar 2, 2024 · 1 comment · Fixed by #56784
Closed
2 tasks done

"Paletted/Unique values" raster rendering is extremely slow using QGIS 3.34.4 / QGIS 3.36.0 #56652

agiudiceandrea opened this issue Mar 2, 2024 · 1 comment · Fixed by #56784
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@elpaso
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Bug Either a bug report, or a bug fix. Let's hope for the latter! Rasters Related to general raster layer handling (not specific data formats) Regression Something which used to work, but doesn't anymore Symbology Related to vector layer symbology or renderers

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@agiudiceandrea
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agiudiceandrea commented Mar 2, 2024 •
edited

What is the bug or the crash?

The rendering of a raster layer with the "Paletted/Unique values" render type is extremely slow using QGIS 3.34.4 / QGIS 3.36.0 (OSGeo4W) on Windows 10 64-bit.
The same raster layer on the same system renders fast using QGIS 3.28.15.

Steps to reproduce the issue

  1. Using QGIS 3.34.4 / QGIS 3.36.0, add the test.tif raster layer (in test.zip) to a new project
  2. set the raster symbology to the "Paletted/Unique values" render type
  3. select a color ramp, click on "Classify", click on OK -> wait for several minutes until the raster is rendered...
Video_2024-03-03_000002.mp4

The issue doesn't occur using QGIS 3.28.15

Video_2024-03-02_234343.mp4

Versions

QGIS version
3.34.4-Prizren
QGIS code revision
decd43d
Qt version
5.15.3
Python version
3.9.18
GDAL/OGR version
3.8.4
PROJ version
9.3.1
EPSG Registry database version
v10.098 (2023-11-24)
GEOS version
3.12.1-CAPI-1.18.1
SQLite version
3.41.1
PDAL version
2.6.0
PostgreSQL client version
16.1
SpatiaLite version
5.1.0
QWT version
6.1.6
QScintilla2 version
2.13.4
OS version
Windows 10 Version 1903

Active Python plugins
db_manager
0.1.20
grassprovider
2.12.99
MetaSearch
0.3.6
processing
2.12.99

QGIS version
3.28.15-Firenze
QGIS code revision
252ad49
Qt version
5.15.3
Python version
3.9.18
GDAL/OGR version
3.8.3
PROJ version
9.3.1
EPSG Registry database version
v10.098 (2023-11-24)
GEOS version
3.12.1-CAPI-1.18.1
SQLite version
3.41.1
PDAL version
2.6.0
PostgreSQL client version
unknown
SpatiaLite version
5.1.0
QWT version
6.1.6
QScintilla2 version
2.13.4
OS version
Windows 10 Version 1903

Active Python plugins
db_manager
0.1.20
grassprovider
2.12.99
MetaSearch
0.3.6
processing
2.12.99
sagaprovider
2.12.99

Supported QGIS version

  • I'm running a supported QGIS version according to the roadmap.

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Additional context

No response
@agiudiceandrea agiudiceandrea added Bug Either a bug report, or a bug fix. Let's hope for the latter! Rasters Related to general raster layer handling (not specific data formats) Symbology Related to vector layer symbology or renderers Regression Something which used to work, but doesn't anymore labels Mar 2, 2024
nyalldawson added a commit to nyalldawson/QGIS that referenced this issue Mar 4, 2024
@nyalldawson
Fix speed regression in paletted raster renderer
6d378d1 
Don't try to condense classes if we have many classes, it's too
slow to do and results in many-minute hangs in the UI for large
class counts

Fixes qgis#56652
@nyalldawson nyalldawson mentioned this issue Mar 4, 2024
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@agiudiceandrea
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It looks like this issue makes QGIS hang for a very long time when importing paletted GeoTIFF layers (e.g. the output layers of some GRASS-GIS processing algorithms).

@elpaso elpaso self-assigned this Mar 9, 2024
elpaso added a commit to elpaso/QGIS that referenced this issue Mar 9, 2024
@elpaso
Raster - paletted: fix slow rendering with huge number of classes
e2ea46f 
Fix qgis#56652
@elpaso elpaso mentioned this issue Mar 9, 2024
Merged
@agiudiceandrea agiudiceandrea mentioned this issue Mar 9, 2024
Closed
2 tasks
qgis-bot pushed a commit that referenced this issue Apr 4, 2024
@elpaso @github-actions
Raster - paletted: fix slow rendering with huge number of classes
6b8f065 
Fix #56652
qgis-bot pushed a commit that referenced this issue Apr 4, 2024
@elpaso @github-actions
Raster - paletted: fix slow rendering with huge number of classes
945c748 
Fix #56652
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@elpaso elpaso

Labels
Bug Either a bug report, or a bug fix. Let's hope for the latter! Rasters Related to general raster layer handling (not specific data formats) Regression Something which used to work, but doesn't anymore Symbology Related to vector layer symbology or renderers
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