Version: 2017.3 (switch to 2017.4)
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EditorGUI.DrawTextureAlpha

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public static void DrawTextureAlpha(Rect position, Texture image, ScaleMode scaleMode = ScaleMode.StretchToFill, float imageAspect = 0);

Parameters

position Rectangle on the screen to draw the texture within.
image Texture to display.
scaleMode How to scale the image when the aspect ratio of it doesn't fit the aspect ratio to be drawn within.
imageAspect Aspect ratio to use for the source image. If 0 (the default), the aspect ratio from the image is used.

Description

Draws the alpha channel of a texture within a rectangle.

See Also: GUI.color, GUI.contentColor


Alpha texture in an Editor Window.

// Load a texture, display the texture, display its alpha channel and
// show a preview of the inverted texture

class EditorGUITextures extends EditorWindow {

    var texture : Texture2D;
    var invertedTexture : Texture2D;
    var showInverted = false;

    @MenuItem("Examples/Texture Previewer")
    static function Init() {
        var window = GetWindow(EditorGUITextures);
        window.position = Rect(0,0,400, 200);
        window.Show();
    }

    function OnGUI() {
        texture = EditorGUI.ObjectField(Rect(3,3,200,20),
                "Add a Texture:",
                texture,
                Texture);
        if(GUI.Button(Rect(208,3, position.width - 210, 20),"Process Inverted")) {
            if(invertedTexture)
                DestroyImmediate(invertedTexture);
            //Copy the new texture
            invertedTexture = new Texture2D(texture.width,
                    texture.height,
                    texture.format,
                    (texture.mipmapCount != 0));
            for (var m : int  = 0; m < texture.mipmapCount; m++)
                invertedTexture.SetPixels(texture.GetPixels(m), m);
            InvertColors();
            showInverted = true;
        }
        if(texture) {
            EditorGUI.PrefixLabel(Rect(25,45,100,15),0,GUIContent("Preview:"));
            EditorGUI.DrawPreviewTexture(Rect(25,60,100,100),texture);
            EditorGUI.PrefixLabel(Rect(150,45,100,15),0,GUIContent("Alpha:"));
            EditorGUI.DrawTextureAlpha(Rect(150,60,100,100),texture);
            EditorGUI.PrefixLabel(Rect(275,45,100,15),0,GUIContent("Inverted:"));
            if(showInverted)
                EditorGUI.DrawPreviewTexture(Rect(275,60,100,100),invertedTexture);
            if(GUI.Button(Rect(3,position.height - 25, position.width-6,20),"Clear texture")) {
                texture = EditorGUIUtility.whiteTexture;
                showInverted = false;
            }
        } else {
            EditorGUI.PrefixLabel(
                Rect(3,position.height - 25,position.width - 6, 20),
                0,
                GUIContent("No texture found"));
        }
    }

    function InvertColors() {
        for (var m : int  = 0; m < invertedTexture.mipmapCount; m++) {
            var c : Color[] = invertedTexture.GetPixels(m);
            for (var i : int = 0 ;i < c.Length; i++) {
                c[i].r = 1 - c[i].r;
                c[i].g = 1 - c[i].g;
                c[i].b = 1 - c[i].b;
            }
            invertedTexture.SetPixels(c, m);
        }
        invertedTexture.Apply();
    }
    function OnInspectorUpdate() {
        Repaint();
    }
}
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