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並前往https://community.appinventor.mit.edu/t/put-a-transparent-color-in-an-image-file-using-javascript-gray-scale-base64-extension/39412

Put a transparent color in an image file using JavaScript. Gray ...

putImageData (surface, 0, 0); //From the canvas you can create a data URL //let ... Disable START CODE FOR GREY SCALE and enable START CODE FOR INVERT COLOR.

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