Bug report #3640

Raster transparency banding in composer output

Added by John Tull over 8 years ago. Updated about 5 years ago.

Status:Closed
Priority:Low
Assignee:Marco Hugentobler
Category:Map Composer/Printing
Affected QGIS version:master Regression?:No
Operating System:OS X Easy fix?:No
Pull Request or Patch supplied:No Resolution:fixed/implemented
Crashes QGIS or corrupts data:No Copied to github as #:13699

Description

Raster layers with transparency show banding when printed. See the example attached. This is using the landcover.30m data from spearfish sample dataset, grass raster. I set the transparency at 50% for this layer and printed to a default composer page, size A0.

raster_output.png - Raster banding in composer output with transparency applied (224 KB) John Tull, 2011-03-18 05:24 PM

qgis-print-transparency-issue.jpeg - example of the problem (804 KB) Dayne Broderson, 2011-08-15 01:29 PM

History

#1 Updated by Dayne Broderson about 8 years ago

I am also seeing this behavior.

Keeping track of my notes at: https://gist.github.com/1147439

This is on 1.8 (git checkout). Easily repeatable from any raster dataset as long as you set your output DPI high enough to cause the error.

#2 Updated by Giovanni Manghi almost 8 years ago

  • Target version changed from Version 1.7.0 to Version 1.7.4

#3 Updated by Paolo Cavallini over 7 years ago

  • Crashes QGIS or corrupts data set to No
  • Target version changed from Version 1.7.4 to Version 1.8.0
  • Affected QGIS version set to master

#4 Updated by Paolo Cavallini about 7 years ago

  • Target version changed from Version 1.8.0 to Version 2.0.0

#5 Updated by Jürgen Fischer over 5 years ago

  • Category changed from 33 to Map Composer/Printing

#6 Updated by Nyall Dawson over 5 years ago

  • Status changed from Open to Feedback
  • Pull Request or Patch supplied set to No

Is this still an issue in current master? If so, can you provide a sample project which illustrates the banding?

#7 Updated by Giovanni Manghi about 5 years ago

  • Resolution set to fixed/implemented
  • Status changed from Feedback to Closed

closing for lack of feedback.

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