Webp compression, bad colouration

[marcus-adamski]

Drag an image into Squoosh, most often a jpg.
Select "Webp"
The resulting compressed image is often badly colourised, using the default configuration.

I've attached a before and after from Unsplash as an example. For this example, squoosh used the default configuration for compression webp. Often, the colouration is much worse, with multiple colours.

NOTE - I've also downloaded and installed webp (0.6.1-2ubuntu0.20.04.2) (from my current Linux repositories), which is the same source code (but a different version) as used by Squoosh. On my initial tests, this installed version does NOT appear to have the same colouration issue, so maybe a bug has been introduced into a later webp version?

OS Configuration:
Linux Mint XFCE (20.3)
Chrome Version 114.0.5735.90 (Official Build) (64-bit)

Attached is the original test source file. Also included is the converted webp file from Squoosh - BUT had to rename the extension to a JPG as Github doesn't support the upload of *.webp files :-)

Also included view from the Squoosh App

[aryanpingle]

Tried it on my pc, seems to work fine. Our Chrome versions are similar, might be an issue with Squoosh WebP on Linux?

Windows 10 Home - Version 10.0.19045 Build 19045
Chrome Version 114.0.5735.110 (Official Build) (64-bit)

[jakearchibald]

@marcus-adamski anything else you can tell us about your setup? What kind of processor does the machine have?

[marcus-adamski]

@jakearchibald, details of my system are:

System: Kernel: 5.4.0-150-generic x86_64 bits: 64 compiler: gcc v: 9.4.0 Desktop: Xfce 4.16.0
tk: Gtk 3.24.20 wm: xfwm4 dm: LightDM Distro: Linux Mint 20.3 Una
base: Ubuntu 20.04 focal
Machine: Type: Desktop System: LENOVO product: 10115 v: IdeaCentre Q190 serial:
Chassis: type: 3 serial:
Mobo: LENOVO model: INVALID v: SDK0F82993 WIN serial: UEFI [Legacy]: LENOVO
v: EZKT22AUS date: 10/15/2013
CPU: Topology: Dual Core model: Intel Pentium 2127U bits: 64 type: MCP arch: Ivy Bridge
rev: 9 L2 cache: 2048 KiB
flags: lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 7582
Speed: 1896 MHz min/max: 800/1900 MHz Core speeds (MHz): 1: 1896 2: 1896
Graphics: Device-1: Intel 3rd Gen Core processor Graphics vendor: Lenovo driver: i915 v: kernel
bus ID: 00:02.0 chip ID: 8086:0156
Display: x11 server: X.Org 1.20.13 driver: modesetting unloaded: fbdev,vesa
resolution: 1920x1080~60Hz
OpenGL: renderer: Mesa DRI Intel HD Graphics 2500 (IVB GT1) v: 4.2 Mesa 21.2.6
compat-v: 3.0 direct render: Yes

[marcus-adamski]

I've used a couple of other wepb online convertor/compressors, and also installed the official webp library (0.61) from the Linux Mint repos - but I've only had the issue with the Squoosh App (so far).