html thumbnails too small and black on high-dpi screen

[Andreas E.]

On a high-dpi screen (with scaling factor 2.0), thumbnails of html files show as heavy black rectangle with only one quarter covered by the rendered html. This is visually disturbing and has little usefulness since the rendered html is too small to be distinguishable between files.

The size parameter results in a thumbnail of 2× the requested pixel width:
gnome-web-photo --mode=thumbnail -s 128 input.html output.png

ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: gnome-web-photo 0.10.6-1
ProcVersionSignature: Ubuntu 3.16.0-24.32-generic 3.16.4
Uname: Linux 3.16.0-24-generic x86_64
ApportVersion: 2.14.7-0ubuntu8
Architecture: amd64
CurrentDesktop: Unity
Date: Tue Nov 18 19:37:50 2014
EcryptfsInUse: Yes
InstallationDate: Installed on 2014-02-02 (288 days ago)
InstallationMedia: Ubuntu-GNOME 14.04 "Trusty Tahr" - Alpha amd64 (20140201)
SourcePackage: gnome-web-photo
UpgradeStatus: Upgraded to utopic on 2014-11-04 (14 days ago)