Feature request #2024
Add Raster Stretching/Enhancement based on portion of image in current window
| Status: | Closed | ||
|---|---|---|---|
| Priority: | Low | ||
| Assignee: |  nobody - | ||
| Category: | Rasters | ||
| Pull Request or Patch supplied: | Resolution: | fixed | |
| Easy fix?: | No | Copied to github as #: | 12084 |
Description
I'd like to have the option to do enhancement/stretching based on the statistics of the portion of the image displayed in the current window (vs. stats of entire image). I posted a message to the developer list and Peter Ersts suggested that this would be a good one to add to the code base and asked that I file a ticket on it. Hopefully this is the right way to do that. :)
History
#1
Updated by ersts - about 15 years ago
- Resolution set to fixed
- Status changed from Open to Closed
It turns out this actually would have been a little easier as a plugin, but it should be core functionality. The issue at hand is that the layer itself does not know what is currently being display. draw() accepts a render context object which is used to determine what portion of the layer to display, but that object comes from the map canvas.
There is a solution in the trunk now, r 12015.
#2
Updated by cgsbob - about 15 years ago
- Resolution deleted (
fixed) - Status changed from Closed to Feedback
Replying to [comment:1 ersts]:
It turns out this actually would have been a little easier as a plugin, but it should be core functionality. The issue at hand is that the layer itself does not know what is currently being display. draw() accepts a render context object which is used to determine what portion of the layer to display, but that object comes from the map canvas.
There is a solution in the trunk now, r 12015.
What a handy addition to qgis! I was thinking that it would be nice to have this functionality available using the legend right click menu.
#3
Updated by ersts - over 14 years ago
- Resolution set to fixed
- Status changed from Feedback to Closed
The option "Stretch using current extent" was added to the right-click legend menu in d5e0f6bf (SVN r14032). This option is not available for "Palette" layers. If this menu option is selected while displaying a single band with a color map or as pseudo color, it will switch the layer back to gray scale. Additionally if, you to not have a contrast enhancement set stretch to min max will automatically be selected.