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#44473 closed enhancement (duplicate)
Produce better image quality/size combination via php Imagick module
| Reported by: | losangelos | Owned by: | |
|---|---|---|---|
| Priority: | normal | Milestone: | |
| Component: | Media | Version: | |
| Severity: | normal | Keywords: | needs-unit-tests has-screenshots has-patch |
| Cc: | Focuses: |
Description
The current implementation of the WP_Image_Editor abstract class via the php-imagick module has a resize function (thumbnail_image) which uses FILTER_TRIANGLE as resize filter by default and some specific values for sharpening and compressing the uploaded jpg image (resize -> sharpen -> compress).
The currently used combination of values/methods for manipulating the uploaded jpg image can be improved by using a combination which produces jpg images better in quality and considerably smaller in size.
We have created a github page https://greenpeace.github.io/planet4-imagestest-results/ where we can compare results produced by 6 different methods.
Method #1 is the default method used by WP currently.
Method #6 produces best quality/size combination among those.
Resize: Lanczos Sharpening: unsharpMask( Radius 1, Sigma 0.45, Amount 3, Threshold 0 ) Compression: Interlace_Plane Quality: 60
Will upload diff file soon.
Hi @losangelos and welcome to Trac!
Thank you for this ticket, but this issue is already tracked in #40415
You are very welcome to contribute to the existing ticket :)
Cheers,
Jb