MatchTemplateMask use alpha for mask pixels like FindImage does.

DocGen/source/tutorials/Image Finding.rst

@@ -0,0 +1,18 @@
+#############
+Image Finding
+#############
+
+Transparent pixels
+==================
+
+With :code:`FindImage` and :code:`FindTemplate` pixels that are fully transparent (being the pixels alpha value is 0) will be "skipped" when searched for.
+
+For example with this image:
+
+.. image:: ../../images/shape.png
+
+With this as the target to search in:
+
+.. image:: ../../images/shape_background.png
+
+Would result with the image being found as transparent pixels would be ignored when searching.

DocGen/source/tutorials/index.rst

@@ -5,6 +5,7 @@ Tutorials
 
    Random Numbers.rst
    Color Finding.rst
+   Image Finding.rst
    Sleep Until.rst
    Targets.rst
    Mouse & Keyboard.rst

Source/simba.matchtemplate_helpers.pas

@@ -104,7 +104,7 @@ function MaskFromTemplate(Templ: TIntegerMatrix): TRGBMatrix;
   H := Templ.Height - 1;
   for Y := 0 to H do
     for X := 0 to W do
-      if (Templ[Y, X] and $FFFFFF) <> 0 then // Mask out alpha
+      if (PByte(@Templ[Y, X])^ <> 0) then // Alpha=0 is transparent. Data is flipped (TIntegerMatrix cast) so check first byte.
         Result.R[Y, X] := 1;
 end;