godot4 shader mixing color unexpectedly

Question

when I import a picture with red, yellow and blue into the shader of godot 3.5 and 4 as sampler2D txeture, they will give me different result.
in the 3.5 it is great, but the godot 4 will mixing all colors then turn the txeture into grey.

Ance

Answer 1

Your bitmap is only 4x4 pixels in size and it got "damaged" by vram compression at import. Reimport it with compression mode set to "lossless"

Orthicon

Answer 2

Can you post a minimal project that reproduces the problem?

Orthicon

Answer 3

https://mega.nz/file/Xd4ShBCB#juOwJUNa20LiDZzbXe_N4uRY-giEAtH--WIkoSOTz5o

Ance

Answer 4

[unknown] solved it just like you say, thank you, really helpful. 🙂

Ance