Opened 10 years ago

Closed 6 years ago

#634 closed defect (fixed)

Pixelation problems with PNG8

Reported by: zspitzer Owned by:
Priority: low Milestone:
Component: Rendering Service Version: 2.1.0
Severity: minor Keywords:
Cc: External ID:

Description

Using PNG8 I am seeing some pixelation issues, mostly black spots and lines which are probably due to sub pixel rendering with AGG

It can been seen on the following page

http://gis.cecc.com.au/mapguide/mapviewerajax/?WEBLAYOUT=Library%3a%2f%2fvicmap%2fweblayouts%2ftiledBasic.WebLayout&LOCALE=en&USERNAME=Anonymous

Server is running Linux and using a build from subversion post 2.0.1

Attachments (2)

Dots.png (127.7 KB) - added by tomfukushima 10 years ago.
Snapshot of the site in case the web site is not available when this ticket is investigated
polygon_edge_noise.png (49.0 KB) - added by zspitzer 10 years ago.

Download all attachments as: .zip

Change History (8)

Changed 10 years ago by tomfukushima

Attachment: Dots.png added

Snapshot of the site in case the web site is not available when this ticket is investigated

Changed 10 years ago by zspitzer

Attachment: polygon_edge_noise.png added

comment:1 Changed 10 years ago by zspitzer

Turns out that if a polygon fill is applied as a base layer then this will remove the noise and will also sharpen up the linework.

comment:2 Changed 9 years ago by jbirch

Please re-test against 2.1 and let us know if this is still an issue (or close if has been fixed). Will close this ticket if no response by next ticket cleanup cycle.

comment:3 Changed 8 years ago by lgnemmi

I have just tested with MG 2.1 and i have the same result on semi-transparent sub-pixels of AGG renderer when there's no background.

comment:4 Changed 8 years ago by lgnemmi

Version: 2.0.12.1.0

comment:5 Changed 8 years ago by zspitzer

RFC60 in 2.2 may resolve this issue

comment:6 Changed 6 years ago by jng

Resolution: fixed
Status: newclosed

2.4 fixes this. None of the observed PNG8 images produced by the test suite (and other informal tests) have this pixelation problem.

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