KTX texture is imported darker as it is - sRGB to linear

[leanmendoza]

Tested versions

• Reproducible in 4.3-stable
  The related code was introduced in August 2023, so it might be happening in 4.2.x as well.

System information

Godot v4.3.stable (77dcf97) - Windows 10.0.22631 - Vulkan (Mobile)

Issue description

I noticed some glTF/glB were darker as I used to see them. Then I realized it was related to the Texture and the KTX format.

I've isolated the texture, and the effect is evident when I just import the texture.

Original texture

Darker texture

After some research, I found that commenting the srgb-to-linear convertion, it works fine:

godot/modules/ktx/texture_loader_ktx.cpp

Line 500 in 0c45ace

if (srgb) {

Steps to reproduce

1. Open a empty project and copy the texture to the project folder
2. Double click the texture resource, you'll notice darker as it is

Minimal reproduction project (MRP)

Example texture
QEbvwX_0.zip