Bilinear interpolation breaks fg-bg separation
jwilk opened this issue · 0 comments
jwilk commented
Poppler can use bilinear interpolation even when the Interpolate flag is not enabled.
For black&white images that don't have the scaling factor exactly right, this can introduce a lot of gray pixels, breaking the foreground-background separation.
It would be great if we could implement some work-around for this.
Bug reports:
- https://bugs.debian.org/760396
- https://bugs.debian.org/764458
- https://bugs.freedesktop.org/show_bug.cgi?id=68360
Relevant Poppler commits:
- 7248da095f67d57c ("Use Interpolate flag to decide whether applying image interpolation during rendering; Fixes bug #9860")
- a97aead193a927b9 ("Splash: Implement bilinear image scaling; Bug #22138")