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// original script : http://answers.unity3d.com/answers/252528/view.html

// Usage: Place this script in Editor/ folder

// Start the tool from menu, Window/Tools/Alpha-fy Images

using UnityEngine;

using UnityEditor;

using System.IO;

public class SpriteBackgroundRemover : EditorWindow

{

Texture2D img;

Texture2D newImg;

Color colorToRemove = Color.magenta;

public static SpriteBackgroundRemove win;

[MenuItem("Window/Tools/Alpha-fy Images")]

static void Init()

{

win = ScriptableObject.CreateInstance(typeof(SpriteBackgroundRemove)) as SpriteBackgroundRemove;

win.minSize = new Vector2(300, 350);

win.ShowUtility();

}

void OnGUI()

{

GUILayout.BeginHorizontal();

/** Toolbar **/

GUILayout.BeginVertical();

img = (Texture2D)EditorGUILayout.ObjectField(img, typeof(Texture2D), false, GUILayout.MinWidth(128), GUILayout.MinHeight(128), GUILayout.MaxWidth(128), GUILayout.MaxHeight(128));

colorToRemove = EditorGUILayout.ColorField(colorToRemove, GUILayout.MaxWidth(128));

if (GUILayout.Button("Preview", GUILayout.MinWidth(128), GUILayout.MinHeight(32), GUILayout.MaxWidth(128), GUILayout.MaxHeight(128)))

newImg = RemoveColor(colorToRemove, img);

if (GUILayout.Button("Alpha-fy All", GUILayout.MinWidth(128), GUILayout.MinHeight(32), GUILayout.MaxWidth(128), GUILayout.MaxHeight(128)))

RemoveColor(colorToRemove, (UnityEngine.Object[])Selection.GetFiltered(typeof(Texture2D), SelectionMode.Assets));

GUILayout.EndVertical();

GUILayout.BeginVertical();

GUILayout.Label("Selected Files", EditorStyles.boldLabel);

foreach (Texture2D selected in Selection.GetFiltered(typeof(Texture2D), SelectionMode.Assets))

{

GUILayout.Label(selected.name);

}

GUILayout.EndVertical();

/** Image Display **/

GUILayout.BeginVertical();

GUILayout.Label("Preview", EditorStyles.boldLabel);

if (newImg)

{

GUILayout.Label(newImg);

}

GUILayout.EndVertical();

GUILayout.EndHorizontal();

}

// for multiple images

void RemoveColor(Color c, UnityEngine.Object[] imgs)

{

if (!Directory.Exists("Assets/AlphaImages/"))

{

Directory.CreateDirectory("Assets/AlphaImages/");

}

float inc = 0f;

foreach (Texture2D i in imgs)

{

inc++;

if (inc % 512 == 0 && EditorUtility.DisplayCancelableProgressBar("Playin' With Pixels", "Seaching for Color Matches", ((float)inc / (float)imgs.Length)))

{

Debug.LogError("Cancelled..");

break;

}

CheckTextureSettings(i);

Color[] pixels = i.GetPixels(0, 0, i.width, i.height, 0);

var clear = new Color(0, 0, 0, 0);

for (int p = 0; p < pixels.Length; p++)

{

if (pixels[p] == c)

{

pixels[p] = clear;

}

}

Texture2D n = new Texture2D(i.width, i.height);

n.SetPixels(0, 0, i.width, i.height, pixels, 0);

n.Apply();

byte[] bytes = n.EncodeToPNG();

File.WriteAllBytes("Assets/AlphaImages/" + i.name + "_alpha.png", bytes);

}

EditorUtility.ClearProgressBar();

AssetDatabase.SaveAssets();

AssetDatabase.Refresh();

}

// for single image

Texture2D RemoveColor(Color c, Texture2D i)

{

CheckTextureSettings(i);

Color[] pixels = i.GetPixels(0, 0, i.width, i.height, 0);

var clear = new Color(0, 0, 0, 0);

for (int p = 0; p < pixels.Length; p++)

{

if (p % 512 == 0 && EditorUtility.DisplayCancelableProgressBar("Playin' With Pixels", "Seaching for Color Matches", ((float)p / pixels.Length)))

{

Debug.LogError("Cancelled..");

break;

}

if (pixels[p] == c)

{

pixels[p] = clear;

}

}

Texture2D n = new Texture2D(i.width, i.height);

n.SetPixels(0, 0, i.width, i.height, pixels, 0);

n.Apply();

EditorUtility.ClearProgressBar();

return (n);

}

public void CheckTextureSettings(Texture2D texture)

{

if (texture == null) { Debug.LogError("CheckTextureSettings Failed - Texture is null"); return; }

string path = AssetDatabase.GetAssetPath(texture);

if (string.IsNullOrEmpty(path)) { Debug.LogError("CheckTextureSettings Failed - Texture path is null"); return; }

TextureImporter textureImporter = AssetImporter.GetAtPath(path) as TextureImporter;

if (!textureImporter.isReadable)

{

Debug.Log("Enabling read/write for image " + path);

// textureImporter.mipmapEnabled = false;

textureImporter.isReadable = true;

AssetDatabase.ImportAsset(path, ImportAssetOptions.ForceUpdate);

}

}

}