Image thumbnail is darker than the original file

[matheusmdx]

Tested versions

• Reproducible in all 4.x versions, also tested in 3.6.

System information

Godot v4.4.dev (75ce426) - Windows 10 (build 19045) - Multi-window, 2 monitors - Vulkan (Forward+) - dedicated AMD Radeon RX 580 2048SP (Advanced Micro Devices, Inc.; 31.0.21921.1000) - AMD Ryzen 5 3600 6-Core Processor (12 threads)

Issue description

As can be seen in the image bottom, Godot generates a thumbnail much more darker than the original file, only the thumbnails seems to be affected. I didn't noticed this behavior in other .webp files.

Steps to reproduce

Open the mrp or download the image and import in your project.

Minimal reproduction project (MRP)

test_thumbnail.zip

image.zip

[Saulo-de-Souza]

If this helps programmers, I opened the project in Godot 4.3 stable and 4.4 dev 7 and it's normal for me. It appears to be something related to your processor or video card.
The settings tested on my PC:
NVIDIA-NVIDIA GeForce RTX 3070
Intel(R) Core(TM) i3-10100 CPU @ 3.60 GHz 3.60 GHz
Windows 11 64-bit operating system.

[Mickeon]

This is a convenient coincidence that happens because of nearest-neighbor or bilinear filtering. You can achieve the same effect by carefully shrinking the image on your editor of choice:

[matheusmdx]

Indeed in some level of shriking this can happen but also as @Saulo-de-Souza show is possible to work as expected. IMO this should be treated a bug, ofc far from be something problematic, but still a bug.

[Mickeon]

It's not a bug. In the screenshots provided, the thumbnails are just the right size where this oddity does not occur. The nearest-neighbor filtering is still the same between both Godot versions.
Again, you can achieve the same effect by shrinking this image using the nearest-neighbor filter. The original image contains many dark pixels which, on specific sizes, are picked to be displayed when the image is shrunk.