Version: 2019.2
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EditorUtility.CompressTexture

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public static void CompressTexture(Texture2D texture, TextureFormat format, int quality);
public static void CompressTexture(Texture2D texture, TextureFormat format, TextureCompressionQuality quality);

Description

Compress a texture.

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); } }