[Unity] Get PNG bytes from RenderTexture with Color Conversion.

SaveTexture.cs

using UnityEngine;

public class SaveTexture : MonoBehaviour
{

    private byte[] SaveRenderTextureAsPng(RenderTexture rt)
    {
        if (rt == null || !rt.IsCreated()) return null;

        // Allocate
        var sRgbRenderTex = RenderTexture.GetTemporary(rt.width, rt.height, 0, RenderTextureFormat.ARGB32,
            RenderTextureReadWrite.sRGB);
        var tex = new Texture2D(rt.width, rt.height, TextureFormat.ARGB32, mipChain: false, linear: false);
            
        // Linear to Gamma Conversion
        Graphics.Blit(rt, sRgbRenderTex);
        
        // Copy memory from RenderTexture
        var tmp = RenderTexture.active;
        RenderTexture.active = sRgbRenderTex;
        tex.ReadPixels(new Rect(0, 0, rt.width, rt.height), 0, 0);
        tex.Apply();
        RenderTexture.active = tmp;
        
        // Get PNG bytes
        var bytes = tex.EncodeToPNG();
            
        // Destroy
        Destroy(tex);
        RenderTexture.ReleaseTemporary(sRgbRenderTex);

        return bytes;
    }
}

Thank you!

Good job