// Opens a file selection dialog for a PNG file and saves a selected texture to the file.

import System.IO;

class EditorUtilitySaveFilePanel {

@MenuItem("Examples/Save Texture to file")
static function Apply () {

var texture : Texture2D = Selection.activeObject as Texture2D;
if (texture == null) {
EditorUtility.DisplayDialog(
"Select Texture",
"You Must Select a Texture first!",
"Ok");
return;
}

var path = EditorUtility.SaveFilePanel(
"Save texture as PNG",
"",
texture.name + ".png",
"png");

if(path.Length != 0) {
// Convert the texture to a format compatible with EncodeToPNG
if(texture.format != TextureFormat.ARGB32 && texture.format != TextureFormat.RGB24){
var newTexture = Texture2D(texture.width, texture.height);
newTexture.SetPixels(texture.GetPixels(0),0);
texture = newTexture;
}
var pngData = texture.EncodeToPNG();
if (pngData != null)
File.WriteAllBytes(path, pngData);
}
}
}