TIFF IMPORT: Premul strangeness
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
Inkscape |
Confirmed
|
Undecided
|
Unassigned |
Bug Description
Summary: It appears that Inkscape's premul code is behaving in ways that might not be as expected. Further, tweaking premul isn't entirely apparent to ignorant buffoons such as this bug reporter.
Reproduction:
1) Create a PNG of a given tone using a blur with alpha.
2) Convert it to TIFF.
3) Import into Inkscape again.
The result will show an obviously dramatic difference in colourspace that is largely to do with premultiplication assumptions made at the software architecture level.
It is quite possible that I am missing a premultiplication feature in Inkscape somewhere - but I'll be darned if I can find it.
As a hasty and ignorant guess I would think that premultiplication should be adjustable to take into the infinite number of output display contexts.
The attachment offers up the default PNG appearance versus the alternate premultiplication assumptions.
tags: | added: bitmap importing |
Changed in inkscape: | |
status: | New → Confirmed |
It also seems to happen with PNG images created with bitmap copy. Not with exported PNGs.