You're ---- thinking about #switch and #case() in an --- odd way.

I see where it's going wrong, and this will give you an idea of why:

    #switch(true)

    #case(1)
     rgb <0, 0, 0.2>
    #break

    #case(
       // no (strcmp(IMG_TYPE,AA), which is the only 'correct' match
       (strcmp(IMG_TYPE,BB))
       | (strcmp(IMG_TYPE,CC))
     )

#switch(true) is a very strange usage, and I'm sure clipka could give some
source-code explanation of why it works the way it does.
But basically, as I suspected, it just selects the FIRST #case() regardless of
what it is.

In fact, check out:

    #switch(strcmp(IMG_TYPE,BB) | strcmp(IMG_TYPE,CC) )

     #case(-10)
     rgb <1, 1, 0>
    #break

     #case(-6)
     rgb <1, 1, 1>
    #break

    #case(1)
     rgb <0, 0, 0.2>
    #break

    #case(1000)

It selects the blue pigment, which corresponds to 1.


So, I think you need to do something along the lines of

#declare IMG_TYPE = (some string operator on your filename)
#if IMG_TYPE = "jpg"  #local AA = 1; #end
#if IMG_TYPE = "png"  #local AA = 2; #end
#if IMG_TYPE = "tiff" #local AA = 3; #end

#select (AA)

.....


OR, since if any one of the cases you want to select for is going to yield a
value of zero for strcmp(),

#declare Pig = strcmp(IMG_TYPE,AA) * strcmp(IMG_TYPE,BB) * strcmp(IMG_TYPE,CC);

and then #select (Pig)

(that works for me)

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