Bug 152685 - The thumbnail of last opened document in start center looks a low resolution pixelated image if document page size a5
Summary: The thumbnail of last opened document in start center looks a low resolution ...
Status: UNCONFIRMED
Alias: None
Product: LibreOffice
Classification: Unclassified
Component: LibreOffice (show other bugs)
Version:
(earliest affected)
7.6.0.0 alpha0+
Hardware: All All
: medium normal
Assignee: Not Assigned
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2022-12-26 10:58 UTC by Telesto
Modified: 2024-04-29 12:40 UTC (History)
3 users (show)

See Also:
Crash report or crash signature:

Attachments
Screenshot (105.03 KB, image/png)
2022-12-26 15:38 UTC, m_a_riosv 		Details
Screenshot current (358.81 KB, image/png)
2022-12-27 10:57 UTC, Telesto 		Details
screenshot on Ubunt 22.04 + LO 24.2.2 (291.65 KB, image/png)
2024-04-29 12:40 UTC, Stéphane Guillou (stragu) 		Details
View All Add an attachment (proposed patch, testcase, etc.)

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Description Telesto 2022-12-26 10:58:02 UTC 
Description:
The thumbnail of last opened document in start center looks a low resolution pixelated image if document page size a5.

Steps to Reproduce:
1. Launch LibreOffice (start center)
2. Open attachment 169348 [details]
3. Close the document -> return to start center
4. Take a look at preview (compare with some other document)

Actual Results:
Fuzzy something

Expected Results:
All thumbnails rendering in the same quality


Reproducible: Always


User Profile Reset: No

Additional Info:
Version: 7.6.0.0.alpha0+ (X86_64) / LibreOffice Community
Build ID: 8635c9aa8c6f1078a9e220076d5a08daf30077e8
CPU threads: 8; OS: Mac OS X 12.3.1; UI render: Skia/Metal; VCL: osx
Locale: nl-NL (nl_NL.UTF-8); UI: en-US
Calc: threaded
Comment 1 m_a_riosv 2022-12-26 15:38:39 UTC 
Created attachment 184355 [details]
Screenshot

What I see.
Version: 7.6.0.0.alpha0+ (X86_64) / LibreOffice Community
Build ID: 376152fbd110cdc0a2cde1fa9758f36c016d9352
CPU threads: 4; OS: Windows 10.0 Build 19045; UI render: Skia/Raster; VCL: win
Locale: es-ES (es_ES); UI: en-US Calc: CL threaded Jumbo
Comment 2 Mike Kaganski 2022-12-27 10:03:39 UTC 
... and I don't see anything unusual. Set its page style to use A4, and the thumbnail text will get smaller (even less readable). Set it to A6, and it will be larger.

A clear screenshot with comparison, along with the "normal" sample to compare (i.e., which produces what you consider OK), is needed.
Comment 3 Telesto 2022-12-27 10:57:24 UTC 
Created attachment 184368 [details]
Screenshot current

I have to compare with older versions to double check
Comment 4 Buovjaga 2023-03-13 11:23:25 UTC 
(In reply to Telesto from comment #3)
> Created attachment 184368 [details]
> Screenshot current
> 
> I have to compare with older versions to double check

It looks like you have a HiDPI screen. I wonder if it somehow makes this more pronounced when you evaluate?
Comment 5 Stéphane Guillou (stragu) 2024-04-29 12:40:32 UTC 
Created attachment 193890 [details]
screenshot on Ubunt 22.04 + LO 24.2.2

I don't reproduce something specific to page size either. See attached screenshot, I also tried switching to A4 while increasing the font size and margins to have a similar layout.

Version: 24.2.2.2 (X86_64) / LibreOffice Community
Build ID: d56cc158d8a96260b836f100ef4b4ef25d6f1a01
CPU threads: 8; OS: Linux 6.5; UI render: default; VCL: gtk3
Locale: en-AU (en_AU.UTF-8); UI: en-US
Calc: CL threaded

I think the real issue is we need higher resolution thumbnails so we can cater for scaled up / hiDPI displays (see bug 155200), which requires getting them out of registrymodifications.xcu (see bug 99716).