Bug 447193

Summary: Wrong tooltip for target PSNR (WebP export)
Product: [Applications] krita Reporter: Karl Ove Hufthammer <karl>
Component: File formatsAssignee: Krita Bugs <krita-bugs-null>
Status: RESOLVED NOT A BUG    
Severity: minor CC: amy
Priority: NOR    
Version First Reported In: git master (please specify the git hash!)   
Target Milestone: ---   
Platform: Other   
OS: Linux   
URL: https://developers.google.com/speed/webp/docs/api#advanced_encoding_api
Latest Commit: Version Fixed In:
Sentry Crash Report:

Description Karl Ove Hufthammer 2021-12-18 17:19:44 UTC
SUMMARY
In the WebP export, the tooltip for ‘Target PSNR’ says:

    If non-zero, specifies the minimal distortion to try to achieve.
    Takes precedence over Target Size.

I’m not *sure* this is wrong, but I can’t get it to make sense. Why would one set a target *minimal* distortion? Shouldn’t this be either the *maximal* distortion or the average distortion or something like that?


STEPS TO REPRODUCE
1. File → Save As … → WebP image → Advanced.
2. Hover over the ‘Target PSNR’ input field.
Comment 1 amyspark 2021-12-18 23:27:40 UTC
Not a bug. This is the official description of the parameter, as taken from the WebP API. The URL has been attached for future reference.