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Bug 22435 - Add a note that numOctaves of feTurbulence should be 10 or less
Summary: Add a note that numOctaves of feTurbulence should be 10 or less
Status: RESOLVED FIXED
Alias: None
Product: CSS
Classification: Unclassified
Component: Filter Effects (show other bugs)
Version: unspecified
Hardware: PC Windows NT
: P2 normal
Target Milestone: ---
Assignee: Dean Jackson
QA Contact: public-css-bugzilla
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2013-06-24 14:36 UTC by Peter Occil
Modified: 2014-11-03 21:40 UTC (History)
4 users (show)

See Also:

Attachments

Description Peter Occil 2013-06-24 14:36:57 UTC 
https://dvcs.w3.org/hg/FXTF/raw-file/default/filters/index.html#feTurbulenceNumOctavesAttribute

Should read:
[[
    The numOctaves parameter for the noise function.

    The lacuna value for ‘numOctaves’ is 1.

    Negative values are unsupported.  This value should not be greater than 10, as higher values are not likely to have a noticeable effect.

    Animatable: yes. 
]]

This is because the Firefox team recently implemented a limit to this value in order to prevent Firefox from hanging if numOctaves is much too big. As noted in the issue [1], "octaves changes have a smaller and smaller effect as they grow larger".

[1]: https://bugzilla.mozilla.org/show_bug.cgi?id=601131
Comment 1 Dirk Schulze 2014-11-03 21:40:19 UTC 
I added the note a while back ago and forgot to comment.

http://dev.w3.org/fxtf/filters/#element-attrdef-numoctaves