EditorUtility.CompressTexture

Description

Сжатие текстур.

Use this function to explicitly compress a texture into specified format.

If you want to do texture compression in-game, use Texture2D.Compress function, which will use faster but lower quality DXT compression.

using UnityEngine;
using UnityEditor;

public class CompressTextureExample : AssetPostprocessor
{
    // Automatically Compress all imported textures to the project to RGB24
    void OnPosprocessTexture(Texture2D t)
    {
        EditorUtility.CompressTexture(t, TextureFormat.RGB24, TextureCompressionQuality.Normal);
    }
}