Strange results of raster-contrast paint property

[slaviczavik]

maplibre-gl-js version: 4.1.2

browser: Chrome 123.0.6312.105

Steps to Trigger Behavior

Easiest way to trigger the behavior is to run the example (link below) and switch style with buttons above map.

1. Init MapLibre with an initial style.
2. Update layer's paint raster-contrast property value.
3. Watch difference between values 0.9 and 1.

Link to Demonstration

JS Bin with simplest example.

Expected Behavior

Rendered result of raster-contrast: 1 should be very similar to raster-contrast: 0.9.

Actual Behavior

The result of raster-contrast: 1 looks more similar to raster-contrast: -1.

Example of strange difference between 0.99 and 1.

[sbachinin]

Can't reproduce it on my windows comp. Contrast 1 looks fine for me

[slaviczavik]

I have just tested it on Windows in Chrome 123.0.6312.88 (64-bit) with same result – with contrast 1 it is greyish and way different than 0.9 –> same as on the picture.

[HarelM]

This is what I get for 1 on my windows machine, very close to 0.9.

Can you try and reproduce this using a render test that will be ran in the CI? It might be something on your end, maybe...