Bug report #18132
Dpi resolution of images exported from composer is wrong
| Status: | Closed | ||
|---|---|---|---|
| Priority: | High | ||
| Assignee: | - | ||
| Category: | Map Composer/Printing | ||
| Affected QGIS version: | 2.18.17 | Regression?: | Yes |
| Operating System: | Easy fix?: | No | |
| Pull Request or Patch supplied: | Yes | Resolution: | fixed/implemented |
| Crashes QGIS or corrupts data: | No | Copied to github as #: | 26025 |
Description
QGIS 2.18.16 64 bit (standalone installer) on Windows 7 SP1 64 bit
When using "Export as Image..." tool from map / print composer, with, for example:
"Page size" = A4 (210x297mm)
"Export resolution" = 150 dpi,
the "Image export options" window is automatically filled with:
"Export resolution" = 150 dpi
"Page width" = 1240 px
"Page eight" = 1753 px
but the exported image (BMP/PNG/JPEG/JPG/TIF/TIFF formats) will be 1240x1753 px with the wrong resolution set to 149 dpi; so it will be of the incorrect size of 211,38x298,83 mm.
The same for, e.g., 300 dpi: the exported image will have the wrong resolution of 299 dpi.
History
#1
Updated by Andrea Giudiceandrea about 6 years ago
The bug is also occurring in 2.18.17
#2
Updated by Giovanni Manghi about 6 years ago
- Status changed from Open to Feedback
- Affected QGIS version changed from 2.18.16 to 2.18.17
Andrea Giudiceandrea wrote:
The bug is also occurring in 2.18.17
please test also QGIS 3, thanks!
#3
Updated by salvatore fiandaca about 6 years ago
I confirm the problem for 2.18.17.
test on QGIS3.0:
A4 150 dpi
exporting I get correct values ie 150 dpi
#4
Updated by Andrea Giudiceandrea about 6 years ago
Further investigating...
I tested some previous versions: 1.8.0, 1.9.0, 2.0.1, 2.10.1 aren't affected; 2.12.0, 2.14.22, 2.16.3 are affected.
So it seems the bug was introduced in 2.12.
#5
Updated by Giovanni Manghi about 6 years ago
- Priority changed from Normal to High
- Regression? changed from No to Yes
#6
Updated by Andrea Giudiceandrea about 6 years ago
I've probably found the commit that introduced the bug:
[composer] Fix image size/resolution was not honored during export (fix #13438)
e553a792561da4a1d5d30040808343e5337eec0b
nyalldawson committed on 4 Oct 2015
#7
Updated by Andrea Giudiceandrea about 6 years ago
Pull request with commit that fixes the bug: https://github.com/qgis/QGIS/pull/6524
#8
Updated by Giovanni Manghi about 6 years ago
- Operating System deleted (
Windows 7 SP1 64 bit) - Pull Request or Patch supplied changed from No to Yes
#9
Updated by Giovanni Manghi about 6 years ago
- Status changed from Feedback to Open
#10
Updated by Andrea Giudiceandrea about 6 years ago
Pull request https://github.com/qgis/QGIS/pull/6524 with commit that fixes the bug
Applied in changeset qgis|4f05da4a0de9e2c17b6e47bed36e7aca1c6d125d.
#11
Updated by Nyall Dawson about 6 years ago
- Resolution set to fixed/implemented
- Status changed from Open to Closed