[tkpng] getting issues with -alpha

Hey there,

First of all, excuse my english ;) I'm using the tkpng package which permit to load png pictures, and change their alpha value... But I'm currenly getting problem when trying to do that : the picture is loaded well, but the picture doesn't get transparent... ?

I use thise syntaxe :
image create photo -format "png -alpha 0.2" -file "test.png"

Is that correct ? And, if someone has already used the alpha transformation, how did he do ?

Thank you :)
.

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