Bug 136548 - Poor kerning preview (maybe font-related)
Summary: Poor kerning preview (maybe font-related)
Status: RESOLVED NOTABUG
Alias: None
Product: LibreOffice
Classification: Unclassified
Component: Writer (show other bugs)
Version:
(earliest affected)
6.4.5.2 release
Hardware: All Windows (All)
: medium normal
Assignee: Not Assigned
URL:
Whiteboard:
Keywords:
Depends on:
Blocks: Font-Rendering Kerning
  Show dependency treegraph
 
Reported: 2020-09-07 12:15 UTC by Ulrich Windl
Modified: 2022-08-19 10:42 UTC (History)
3 users (show)

See Also:
Crash report or crash signature:


Attachments
Partial screen shot showing the problem (2.88 KB, image/png)
2020-09-07 12:16 UTC, Ulrich Windl
Details
Screenshot with zoom 100% (2.56 KB, image/jpeg)
2020-12-30 11:07 UTC, Dieter
Details
Partial screen shot (Writer, showing "kernel" in italics) (37.34 KB, image/png)
2022-08-18 12:38 UTC, Ulrich Windl
Details
Partial screen shot (MS-Word, showing "kernel" in italics) (15.35 KB, image/png)
2022-08-19 07:50 UTC, Ulrich Windl
Details
Kerning detail with kerning turned off for 'r' 'n' pair (fontforge-20200314) (25.20 KB, image/png)
2022-08-19 07:52 UTC, Ulrich Windl
Details
Kerning detail with kerning turned on for 'r' 'n' pair (fontforge-20200314) (26.11 KB, image/png)
2022-08-19 07:53 UTC, Ulrich Windl
Details

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Description Ulrich Windl 2020-09-07 12:15:35 UTC
Description:
Viewing "IDRAC" written in Liberation Serif (10.5pt) at 100% zoom (Windows 10, 24" FHD LCD screen), it looks as if there's a space between "a" AND "C" (see attachment).

Steps to Reproduce:
1. Use "Liberation Serif" font at 10.5pt size, zoom level 100%
2. Write "DRAC"


Actual Results:
Spacing between letters seems irregular

Expected Results:
Spacing between letters should look equally distributed


Reproducible: Always


User Profile Reset: No



Additional Info:
The issue is less visible in Linux
Comment 1 Ulrich Windl 2020-09-07 12:16:18 UTC
Created attachment 165229 [details]
Partial screen shot showing the problem
Comment 2 Dieter 2020-12-30 11:07:25 UTC
Created attachment 168574 [details]
Screenshot with zoom 100%

Attachment shows result with

Version: 7.2.0.0.alpha0+ (x64)
Build ID: 315c7570c4a72f4c834086082825533b1e50d1bf
CPU threads: 4; OS: Windows 10.0 Build 19042; UI render: Skia/Raster; VCL: win
Locale: de-DE (de_DE); UI: en-GB
Calc: threaded

There seems to be less space between 'RA' than between 'DR' and 'AC', but it's not the same result as in comment 0.
Comment 3 Ulrich Windl 2021-01-04 13:24:19 UTC
Trying different zoom levels, the effect seemed to be most visible at 100% zoom.
Comment 4 Buovjaga 2021-11-25 15:50:24 UTC
No repro with 100% zoom.

Maybe try with 7.2.

Version: 7.3.0.0.alpha1+ (x64) / LibreOffice Community
Build ID: 515682539623c9d61921c4f89302ffa0a4cb8d24
CPU threads: 2; OS: Windows 10.0 Build 19042; UI render: Skia/Raster; VCL: win
Locale: fi-FI (fi_FI); UI: en-US
Calc: threaded

Set to NEEDINFO.
Change back to UNCONFIRMED, if the problem persists. Change to RESOLVED WORKSFORME, if the problem went away.
Comment 5 Telesto 2022-01-17 20:18:32 UTC
I guess this should be gone in the latest master build. A large bunch of those issues are addressed.. The full line in the specific document is needed..  

https://dev-builds.libreoffice.org/daily/master/current.html
Comment 6 QA Administrators 2022-07-17 03:30:34 UTC Comment hidden (obsolete)
Comment 7 QA Administrators 2022-08-17 03:35:10 UTC Comment hidden (obsolete)
Comment 8 Ulrich Windl 2022-08-18 12:38:34 UTC
Created attachment 181852 [details]
Partial screen shot (Writer, showing "kernel" in italics)

Maybe the Liberation Serif font has an issue (10,5pt, italic) at 100% zoom:
The word "kernel" looks very much like "kemel".
Seen in Libreoffice 7.2.7.2 (x86) on Windows 10 20H2 (Build 19042.1826).
Comment 9 Ulrich Windl 2022-08-18 12:40:58 UTC
(In reply to Ulrich Windl from comment #8)
> Maybe the Liberation Serif font has an issue (10,5pt, italic) at 100% zoom:

Sorry the heading is 11,8pt; the body text is 10,5pt.
Comment 10 Buovjaga 2022-08-18 12:42:28 UTC
(In reply to Ulrich Windl from comment #8)
> Created attachment 181852 [details]
> Partial screen shot (Writer, showing "kernel" in italics)
> 
> Maybe the Liberation Serif font has an issue (10,5pt, italic) at 100% zoom:
> The word "kernel" looks very much like "kemel".
> Seen in Libreoffice 7.2.7.2 (x86) on Windows 10 20H2 (Build 19042.1826).

As Telesto mentioned in January, could you try with a master build as there were many fixes? Win-x86_64@tb77-TDF from https://dev-builds.libreoffice.org/daily/master/current.html
Comment 11 Dieter 2022-08-18 12:44:33 UTC
(In reply to Buovjaga from comment #10)
> As Telesto mentioned in January, could you try with a master build as there
> were many fixes? Win-x86_64@tb77-TDF from
> https://dev-builds.libreoffice.org/daily/master/current.html

=> NEEDINFO

Or test at least with 7.4 (released today).
Comment 12 Ulrich Windl 2022-08-19 07:50:34 UTC
Created attachment 181878 [details]
Partial screen shot (MS-Word, showing "kernel" in italics)

It seems to be a font issue as Microsoft Word displays the same text in a very similar way (on the same machine).
Comment 13 Ulrich Windl 2022-08-19 07:52:45 UTC
Created attachment 181879 [details]
Kerning detail with kerning turned off for 'r' 'n' pair (fontforge-20200314)
Comment 14 Ulrich Windl 2022-08-19 07:53:18 UTC
Created attachment 181880 [details]
Kerning detail with kerning turned on for 'r' 'n' pair (fontforge-20200314)
Comment 15 Dieter 2022-08-19 08:04:08 UTC
"kernel" in screenshot from Word (comment 13) looks better than from LO in comment 8. But with

Version: 7.4.0.3 (x64) / LibreOffice Community
Build ID: f85e47c08ddd19c015c0114a68350214f7066f5a
CPU threads: 4; OS: Windows 10.0 Build 19044; UI render: Skia/Raster; VCL: win
Locale: de-DE (de_DE); UI: en-GB
Calc: CL

I get a similar result as in word and I won't consider this as a bug.

Steps:
1. Write "kernel" with 11,8pt, old and italic
Comment 16 Buovjaga 2022-08-19 08:07:44 UTC
Thanks for testing, Ulrich and Dieter. Let's close. Caolán is working on more improvements to kerning across the whole suite.
Comment 17 Ulrich Windl 2022-08-19 08:17:29 UTC
So I guess Writer cannot do much better with the 'r'-'n'-pair. Same is probably true for the 'A'-'C'-pair.
Comment 18 Buovjaga 2022-08-19 08:41:02 UTC
(In reply to Ulrich Windl from comment #17)
> So I guess Writer cannot do much better with the 'r'-'n'-pair. Same is
> probably true for the 'A'-'C'-pair.

You changed the status to unconfirmed. Are you still arguing that there is a bug or was it a mistake?
Comment 19 Ulrich Windl 2022-08-19 09:51:18 UTC
(In reply to Buovjaga from comment #18)
> You changed the status to unconfirmed. Are you still arguing that there is a
> bug or was it a mistake?

Actually it was an update conflict with comment #16: I wanted to add the comment, but forgot about the status change. Please adjust as you think it's correct!