Red Hat Bugzilla – Bug 452782
[liberation-fonts] Quality Check between initial 1.03 and latest dist.
Last modified: 2008-06-27 00:54:50 EDT
Description of problem:
The glyphs in latest version should be same as initial ver 1.03 from manufacturer.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Install liberation-fonts initial ver 1.03 from
2. Load attached word file in gnome.
3. Run fc-cache in /usr/share/fonts/liberation.
4. Capture screenshots on each font.
5. Install liberation-fonts ver 1.04.beta from
6. Load attached word file in gnome.
7. Run fc-cache in /usr/share/fonts/liberation.
8. Capture screenshots on each font.
9. Use GIMP to stack pictures as pairs by font.
10.Compare the results.
Some glyphs have displacement by 1 pixel.
All glyphs are identical.
The fonts were compared with OpenOffice the other day but there are certain
Tested with gedit again with smoothing and hinting off, there are no differences
on glyphs. The glyph differences might be coming from rendering engines.
Created attachment 310226 [details]
Rendering of ver 1.03 by gedit.
Created attachment 310227 [details]
Rendering of ver 1.04 by gedit.
Created attachment 310228 [details]
Comparison of ver 1.03 and 1.04.
Created attachment 310229 [details]
Rendering of ver 1.03 by gedit. (smoothing + hinting on)
Created attachment 310230 [details]
Rendering of ver 1.04 by gedit. (smoothing + hinting on)
Created attachment 310231 [details]
Comparison of ver 1.03 and 1.04. (smoothing + hinting on)
Created attachment 310232 [details]
Test Case in OpenOffice format.
Created attachment 310233 [details]
Test Case in plain text.
Created attachment 310407 [details]
Test sample with no hinting no smoothing.
These samples proved the glyphs has no difference when no hinting and no
To test, simply put the picture of one version on another in GIMP, set "layer
mode" of the upper layer as "Difference".
If there is any pixel differences such pixels will be in white color (which is
"1" in XOR / with differece). Otherwise, pixels will be in black color (which
is "0" in XOR / no difference).
Created attachment 310410 [details]
Test sample with full hinting and subpixel smoothing.
Test with/without hinting and smoothing on gedit. There is no difference found
in results (see comment #10 comment #11).