Disable bilinear filtering of images at native resolution -- Patch supplied
Submitted by Charles Hyder
Assigned to poppler-bugs
Here's a PDF file that contains scanned (raster) b/w image @ 400dpi, together with the result of its rendering with pdftoppm from two poppler releases: 0.20.5 & 0.24.0:
The latter (newer version) produces a fuzzy image. In fact, I've also tried version 0.22.x and it also gives fuzzy results. The effect is not specific to the PDF file: it is reproduced on any PDF file that contains raster b/w images.
Meanwhile, pdfimages (ImageOutputDev) works just fine. So I figure it must be the SplashOutputDev