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IDProjectCategoryView StatusDate SubmittedLast Update
0002564DCP-o-maticBugspublic2023-06-16 23:152025-10-29 11:02
Reportercarl Assigned Tocarl  
PriorityhighSeveritymajorReproducibilityalways
Status closedResolutionfixed 
Target Version2.16.x 
Summary0002564: Strange white line down right hand side of PNG
Description

Loading the example in git puts a white line down the right hand side of the image; happens on Windows and Linux (at least).

TagsNo tags attached.
Branch2564-alpha
Estimated weeks required
Estimated work requiredUndecided

Relationships

related to 0002681 resolvedcarl Alpha channel not rendered correctly in ProRes4444 files 

Activities

carl

2023-06-18 22:41

administrator   ~0005764

As the submitter pointed out (I think) it seems to have a two-pixel transparency line on the right-hand side.

carl

2023-06-18 23:50

administrator   ~0005765

libswscale has this ff_sws_alphablendaway thing which should set alpha to black if alphablend is set to "uniform_color" (see branch) but it doesn't work because the condition in libswscale/utils.c which decides whether to use ff_sws_alphablendaway doesn't trip because unscaled=0.

carl

2024-01-09 20:31

administrator   ~0006217

Fixed by fix to 0002681.

Issue History

Date Modified Username Field Change
2023-06-16 23:15 carl New Issue
2023-06-16 23:15 carl Assigned To => carl
2023-06-16 23:15 carl Status new => confirmed
2023-06-16 23:16 carl Estimated work required => Undecided
2023-06-16 23:17 carl Summary PNG transparency shown as white on Windows => PNG transparency shown as white
2023-06-16 23:17 carl Description Updated
2023-06-16 23:18 carl Description Updated
2023-06-16 23:21 carl Summary PNG transparency shown as white => Strange white line down right hand side of PNG
2023-06-16 23:21 carl Description Updated
2023-06-18 22:41 carl Note Added: 0005764
2023-06-18 23:50 carl Note Added: 0005765
2023-06-18 23:51 carl Branch => 2564-alpha
2023-06-21 20:48 carl Target Version 2.16.60 => 2.16.x
2024-01-09 20:30 carl Relationship added related to 0002681
2024-01-09 20:31 carl Note Added: 0006217
2024-01-09 20:31 carl Status confirmed => resolved
2024-01-09 20:31 carl Resolution open => fixed
2025-10-29 11:02 carl Status resolved => closed