Transform a string variable to a json variable.
Waiting this program N second.
Print a string to an image.
Multiplied an double value to an image.
Minus an int ( gray value ) to an image.
Use a pattern to match an image, and show the difference.
Draw rectangles to an image.
Divided an double value to an image.
Add an int ( gray value ) to an image.
Create an empty image.
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