Distortion in image scaling
Submitted by Hadmut Danisch
Assigned to poppler-bugs
I found that evince is producing distorted pictures, slight problems when displaying an image.
The authors of evince were able to reproduce the problem and asked me to file the bug against poppler/cairo.
I am preparing pictures for a given screen size to fit in exactly without rescaling, e.g. to fit into a 1024x768 screen. I therefore generate a PDF document with the same aspect and paste pictures into to fully expand to either width or height (depending on aspect).
While in principle evince does what I expect, you'll find little distortions when comparing the picture with what evince displays
E.g. compare the details at the car or the cables in to top right corner at
you'll find a visible loss of image quality both on larger screens where both need to be rescaled as on screen with the exact height of 768 pixels.
Screendump with distortions (look at the cables or the car):