Feature #4014

Raster histogram drawing effectively freezes UI for large images

Added by Donkagen2 - almost 2 years ago. Updated 8 months ago.

Status:New Start Date:06/23/2011
Priority:Normal Due date:
Assigned to:Tim Sutton % Done:

0%
Category:GUI
Target version:Version X - Unplanned
Platform: Resolution:
Platform version: Patch supplied:No
Status info:

Description

If someone selects the histogram tab (intentionally or by error) with a very large image, they are stuck with waiting a long time while the graph is generated.

For novice users this can be confusing and, for anyone clicking the tab in error, frustrating as there is no way to abort a process that could take several minutes.

If the calculation was started by a specific button click (e.g. Calculate), the frustration would be avoided.

History

#1
Updated by Nathan Woodrow almost 2 years ago

  • Assigned to set to Tim Sutton
  • Target version set to Version 1.7.1
  • Patch supplied set to No

I agree this can be very frustrating. Clicking it on a 5GB ecw I have freezes QGIS and you have no idea how long it will take.

Suggestion to improve experience:
  • Thread the collection of info from the raster.
  • Only load histogram on demand with a button. Even with demand loading it should still be threaded, no need to make the user wait.
  • Show progress bar with current info collection status.

#2
Updated by Tim Sutton over 1 year ago

  • Target version changed from Version 1.7.1 to Version 1.7.2

#3
Updated by Giovanni Manghi over 1 year ago

  • Target version changed from Version 1.7.2 to Version 1.7.3

#4
Updated by Giovanni Manghi over 1 year ago

  • Target version changed from Version 1.7.3 to Version 1.7.4

#5
Updated by Giovanni Manghi about 1 year ago

  • Target version changed from Version 1.7.4 to Version 2.0.0

#6
Updated by Pirmin Kalberer 8 months ago

  • Target version changed from Version 2.0.0 to Version X - Unplanned

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