Bug report #16396
Inconsistent transparency behavior when using blending and PNG export
Status: | Closed | ||
---|---|---|---|
Priority: | Normal | ||
Assignee: | - | ||
Category: | Unknown | ||
Affected QGIS version: | 2.18.4 | Regression?: | No |
Operating System: | Easy fix?: | No | |
Pull Request or Patch supplied: | No | Resolution: | fixed/implemented |
Crashes QGIS or corrupts data: | No | Copied to github as #: | 24305 |
Description
Combination of blending techniques can be used to produce a composer map item that achieve transparency in composer view but is exported as an opaque white object when exporting to PNG.
I produced a demonstration .qgs file embedded in the attached zip.
This is what you see in the composer.
This is what you get when opening the resulting png using gimp.
As you might notice map 3 & 4 both achieve transparency because the yellow rectangle in the background is visible in the resulting png.
However a white background is applied on map 4 for whatever reason.
Tested on windows 10 & Ubuntu 14.04 with Qgis 2.18.5
History
#1
Updated by Giovanni Manghi over 7 years ago
- Regression? set to No
- Easy fix? set to No
#2
Updated by Jürgen Fischer almost 7 years ago
- Category set to Unknown
#3
Updated by salvatore fiandaca over 5 years ago
- Description updated (diff)
- Status changed from Open to Closed
trying in 3.4.4-3 it is not possible to activate the theme 'masked' in the TOC, therefore it is evaluated as a problem of 2.18 and not of 3.4
#4
Updated by Giovanni Manghi over 5 years ago
- Resolution set to fixed/implemented
salvatore fiandaca wrote:
trying in 3.4.4-3 it is not possible to activate the theme 'masked' in the TOC, therefore it is evaluated as a problem of 2.18 and not of 3.4
when closing a ticket please add a proper resolution.
#5
Updated by salvatore fiandaca over 5 years ago
- Status changed from Closed to Reopened
I'm sorry,
I studied the problem and in my opinion is a problem limited to 2.x; to avoid problems reapro issue
#6
Updated by Giovanni Manghi over 5 years ago
- Status changed from Reopened to Closed
salvatore fiandaca wrote:
I'm sorry,
I studied the problem and in my opinion is a problem limited to 2.x; to avoid problems reapro issue
If a ticket needs to be reopened then resolution must be removed. Anyway if is a 2.x only issue this must be ticket, as 2.* is EOL.