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Bug 23562 - ”Quality level” for image/jpeg needs to be defined
Summary: ”Quality level” for image/jpeg needs to be defined
Status: RESOLVED WONTFIX
Alias: None
Product: HTML WG
Classification: Unclassified
Component: HTML5 spec (show other bugs)
Version: unspecified
Hardware: PC Windows NT
: P2 editorial
Target Milestone: ---
Assignee: This bug has no owner yet - up for the taking
QA Contact: HTML WG Bugzilla archive list
URL:
Whiteboard: whatwg-resolved
Keywords:
Depends on:
Blocks:
 
Reported: 2013-10-18 13:12 UTC by Jukka K. Korpela
Modified: 2016-10-25 09:30 UTC (History)
5 users (show)

See Also:

Attachments

Description Jukka K. Korpela 2013-10-18 13:12:19 UTC 
The table at 4.8.11.2 (Serializing bitmaps to a file) says that for image/jpeg format, the second argument of toDataURL() “must be treated as the desired quality level”. There is no definition for what “quality level” means here and what effect it has, and the old JPEG specification cited,
http://www.w3.org/Graphics/JPEG/jfif3.pdf
does not define it either (it does not contain the word “quality”).
Comment 1 Arron Eicholz 2016-04-22 21:04:50 UTC 
HTML5.1 Bugzilla Bug Triage: Won't fix, quality/compression is actually defined in the specification for JPEG. https://www.iso.org/obp/ui/#iso:std:iso-iec:10918:-1:ed-1:v1:en 

If this resolution is not satisfactory, please copy the relevant bug details/proposal into a new issue at the W3C HTML5 Issue tracker: https://github.com/w3c/html/issues/new where it will be re-triaged. Thanks!