| Niharika | |
| Jan 8 2019, 2:46 AM |
| F27846569: Screen Shot 2019-01-10 at 2.18.21 PM.png | |
| Jan 10 2019, 7:19 PM |
| F27845372: Screenshot_2019-01-10 File 2014 West Africa Ebola Epidemic - New Cases per Week svg - Wikimedia Commons.png | |
| Jan 10 2019, 4:22 PM |
| F27838521: image.png | |
| Jan 10 2019, 2:01 AM |
| F27838527: image.png | |
| Jan 10 2019, 2:01 AM |
| F27834777: 750px-2014_West_Africa_Ebola_Epidemic_-_New_Cases_per_Week.svg - from svgtranslate.png | |
| Jan 9 2019, 6:42 PM |
| F27834720: 5574058166d32766b247a4ab0d192c6a.png | |
| Jan 9 2019, 6:40 PM |
Seemingly SVG Translate's PNGs differ from Commons' version slightly. Here's an example:
Commons versus SVG Translate
Note the differences in character and word spacings along the X axis and the legend.
What's causing this and can we fix it?
| SVG Translate | Commons |
| Status | Subtype | Assigned | Task | ||
|---|---|---|---|---|---|
| Resolved | hnowlan | T213139 Discrepancies in SVG Translate's pngs and Commons' versions in character and word spacings | |||
| Resolved | JoKalliauer | T36947 Incorrect text positioning in SVG rasterization (scale/transform; font-size; kerning) | |||
| Resolved | hnowlan | T193352 Update librsvg to ≥2.42.3 (2.44.10) | |||
| Resolved | hnowlan | T216815 Upgrade Thumbor to Buster | |||
| Invalid | None | T212941 Investigate systemd hardening to replace Firejail for Thumbor | |||
| Resolved | fgiunchedi | T212946 Stream Thumbor logs to logstash | |||
| Resolved | • Gilles | T187765 Replace the Nginx fronting Thumbor with Haproxy | |||
| Resolved | fgiunchedi | T204266 Backport prometheus haproxy exporter for Jessie | |||
| Resolved | jijiki | T220499 Export useful metrics from haproxy logs for Thumbor | |||
| Resolved | jijiki | T221562 Build Thumbor packages for buster |
@Samwilson Flagging this for you. I didn't find any other example with substantive differences in my brief search but there will probably be some more. Can we figure out what's causing the differences?
It gets worse than just font problems! I've just found one where our rendering makes the Malleus label in Anatomy_of_the_Human_Ear_en.svg head out on a weird angle:
This is only with custom transations, not with unmodified images, so seems likely to be due to our SVG manipulating and not with rsvg.
Actually, sorry, this is probably a completely separate bug! :) But I'll investigate further before opening another ticket.
@Samwilson That does seem unrelated. It is interesting because we largely don't intentionally mess with coordinates or any kind of positioning.
Here's a screenshot of what I see on the two sites:
| SVG Translate | Commons |
Notice the legend and X-axis character and word spacing differences.
It seems like Sam and I don't see the same image on Commons and hence the differences. Let's ignore this ticket until we see more substantive differences.
The font difference is due to packages: for production to render the SVGs, it has tons of additional fonts installed, unlike our container.
Can we install those on our container as well? They might especially be useful for non-latin languages.
I'm still not sure why Niharika and I are seeing different things on the file page on Commons. Can anyone else confirm that when they look at this, the kerning of the word 'Total' in the chart legend is incorrect? This is what I see:
Here's a screenshot of what I see on the two sites:
SVG Translate (1292px) Commons (1524px) Notice the legend and X-axis character and word spacing differences.
Comparing different resolutions of svgs containing T36947 (i.e. font-sizes below 25px) is like comparing apples with cars.
T36947 is
So this is a librsvg-issue. (librsvg released a fix two weeks ago, however WMF is using a outdated librsvg-version which is unmaintained&depreciated since 2017.)