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public int resWidth = 2550; 
public int resHeight = 3300;
                
private bool takeHiResShot = false;
                
public static string ScreenShotName(int width, int height) {
return string.Format("{0}/screen_{1}x{2}_{3}.png", 
              Application.dataPath, 
              width, height, 
              System.DateTime.Now.ToString("yyyy-MM-dd_HH-mm-ss"));
}
    
public void TakeHiResShot() {
    takeHiResShot = true;
}
    
void LateUpdate() {
    takeHiResShot |= Input.GetKeyDown("k");
    if (takeHiResShot) 
    {
           RenderTexture rt = new RenderTexture(resWidth, resHeight, 24);
           camera.targetTexture = rt;
           Texture2D screenShot = new Texture2D(resWidth, resHeight, TextureFormat.ARGB32, false);
           camera.Render();
           RenderTexture.active = rt;
           screenShot.ReadPixels(new Rect(0, 0, resWidth, resHeight), 0, 0);
           camera.targetTexture = null;
           RenderTexture.active = null; 
           Destroy(rt);
           byte[] bytes = screenShot.EncodeToPNG();
           string filename = ScreenShotName(resWidth, resHeight);
 
           System.IO.File.WriteAllBytes(filename, bytes);
           Debug.Log(string.Format("Took screenshot to: {0}", filename));
           Application.OpenURL(filename);
           takeHiResShot = false;
    }
}