[#CONF-8343] Poor quality of Thumbnails

Confluence

Poor quality of Thumbnails

Created: 26/Apr/07 03:51 AM Updated: 08/May/07 02:46 AM

Component/s:

Attachments, Pages

Affects Version/s:

2.3.3, 2.4.4

Fix Version/s:

2.5.1, 2.6.0

Time Tracking:

Not Specified

File Attachments:

None

Image Attachments:

1. conf_thumbnail_poor.JPG (6 kB)	2. foo.jpg (452 kB)	3. foo_tn.jpg (7 kB)
4. foo_tn_paint.jpg (11 kB)

Environment:

JDK 1.5.0_10

Issue Links:

Reference

This issue relates to:

~~CONF-1725~~ Poor quality of thumbnails

Participants:	Anatoli Kazatchkov [Atlassian], Charles Miller [old account, do not assign issues], Frank Stiller and Tom Davies [Atlassian]
Since last comment:	1 year, 22 weeks, 5 days ago
Resolution Date:	02/May/07 11:49 PM
Labels:

Description

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In Confluence 1.2.1 it was closed. But recently i saw that in all our running instances of confluence (2.3.3, 2.4.4) the thumbnail quality is broken again.

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Charles Miller [old account, do not assign issues] added a comment - 26/Apr/07 09:04 PM

What version of the JDK are you running Confluence under? The Bilinear filter used to generate the higher-quality thumbnails only works on Java 1.5 or higher.

You may also need to delete the contents of the confluence-home/thumbnails directory to remove any cached low-quality thumbnails.

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Frank Stiller added a comment - 27/Apr/07 01:24 AM

We are running JDK 1.5.0.10 since 8 months or so, so most of the thumbnails were created during that time. Any lately created thumbnail gets the quality of the image above (which was also created on jdk 1.5 already).

Arent the thumbnails created new on upgrading of confluence? Of course i dont save the thumbnails folder on reemporting a backup.

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Charles Miller [old account, do not assign issues] added a comment - 29/Apr/07 05:40 PM

If that's the case, I can't see why the thumbnail quality would have degraded. We'll investigate and try to reproduce this problem ourselves.

(It's a good idea to fill in the "Environment" section when you submit a bug report, so that we can discount obvious causes like JDK versions)

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Tom Davies [Atlassian] added a comment - 29/Apr/07 06:38 PM

Frank, please create a thumbnail for the attached image so that I can compare it to what I get.

Thanks,
Tom

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Frank Stiller added a comment - 30/Apr/07 02:00 AM

first is the thumbnail out of a confluence 2.3.3 installation.

second (_tn_paint) comes from a paint program

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Frank Stiller added a comment - 30/Apr/07 02:03 AM

what i can see is that, the thumbnail of the original here looks exactly the same as the thumbnail i have uploaded, here in jira. (foo and foo_tn)

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Anatoli Kazatchkov [Atlassian] added a comment - 02/May/07 11:49 PM

Changed the scaling algorithm to produce better looking thumbnails.

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Frank Stiller added a comment - 08/May/07 02:46 AM

test... i didnt got any message that the issue was resolved... just saw it in the release notes...