Search Issue Tracker

Won't Fix



Found in





Issue ID




Texture becomes lower quality when the texture is downloaded with script



Reproduction steps:
1. Open the attached "(FAV) PROJECTFILE" project
2. Open the "Assets/Scenes/SampleScene 1.unity" scene
3. Enter the Play mode
4. Observe the Game view

Expected result: The “Original” and “Downloaded” textures have the same quality and have no differences
Actual result: The “Downloaded” texture quality is lower compared to the “Original” image

Reproducible with: 2021.3.29f1, 2021.3.33f1, 2022.3.14f1, 2023.2.3f1, 2023.3.0a17
Not reproducible with: 2021.3.28f1

Reproducible on: macOS Sonoma 14.1.1 (M1 Max), Windows 11
Not reproducible on: No other environment tested

  1. Resolution Note:

    In the provided sample it's the opposite: the original is of lower quality, while downloaded image looks like what is seen if opened in web browser.
    The reason for the difference is because UnityWebRequest after latest changes creates texture with mipmaps enabled, while image in Unity project does not have them. Enabling mip maps for the texture in Unity project makes the "original" image look the same as downloaded. I can get the other way around by adding this code:
    var copy = new Texture2D(myTexture.width, myTexture.height, myTexture.format, false);
    Graphics.CopyTexture(myTexture, 0, 0, copy, 0, 0);

    We plan to add public APIs to UnityWebRequest for controlling mipmap in the future. For now if you want a texture without mipmaps, use regular download and convert downloaded image bytes to texture using ImageConversion class.

Add comment

Log in to post comment

All about bugs

View bugs we have successfully reproduced, and vote for the bugs you want to see fixed most urgently.