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Turn an image into a silhouette

To convert an image to a colored silhouette, we can use a im.Matrix, with the help of this function (and its associated convenience function):

 init:
     python:
         def silhouette_matrix (r,g,b,a=1.0):
             return im.matrix((0, 0, 0, 0, r, 
                               0, 0, 0, 0, g,
                               0, 0, 0, 0, b,
                               0, 0, 0, a, 0,))
         def silhouetted (filename, r,g,b, a = 1.0):
             return im.MatrixColor (Image (filename), silhouette_matrix (r,g,b,a))

What the matrix above says is:

Multiply the RGB values of the source image by 0, then add the given color
Multiply the alpha channel by 'a' (default value = 1.0).. by default, preserve the alpha channel as-is

Once that function is defined in an init block as above, we can do things like this simple glowing effect:

 # this is the logo from the tutorial game (needed for this example)
 image logo = "logo.png"
 # and here's a version converted to a white silhouette
 image logo_whiteout = silhouetted ('logo.png',1,1,1)
 
 label start:
    # now we use some ATL to overlay the 'glow' on the logo and cycle its alpha.
    show logo:
        xalign 0.5 yalign 0.0
    show logo_whiteout:
        xalign 0.5 yalign 0.0 alpha 0.0
        ease 1.0 alpha 0.95
        ease 1.0 alpha 0.0
        repeat
    "Here we have the amaaazing glowing logo!\n\n{b}TADAAAA!{/b}"