PNG ??? ??? ??
PNG ???? ??? ? ?? ??? ???? ???? ?? ??? ? ????. ??? ? ?? ?? ??? ??? ????.
1??: ??? ?? ???
JavaScript? ??? ??? ???? PNG ???? ??? ??? ??? ??? ?????. ? ???? ???? ??? ??? ??? ???? ?????.
var img = document.getElementById('my-image'); var canvas = document.createElement('canvas'); canvas.width = img.width; canvas.height = img.height; canvas.getContext('2d').drawImage(img, 0, 0, img.width, img.height);
2??: ?? ?? ??
???? ??? ? ?????? event.offsetX ? event.offsetY ??? ???? ?? ??? ????. ??? ??? ??? ?? ??? ???????.
3??: ?? ??? ??
getImageData() ???? ???? ??? ???? ?? ???? ?????. ?? ??? ???, ??, ??? ? ??(RGBA) ?? ? ?? ? ??? ?????.
var pixelData = canvas.getContext('2d').getImageData(event.offsetX, event.offsetY, 1, 1).data;
4??: ?? ? ??
pixelData ??? ? ?? ??? ??? ?? ?? ??? ???? ?????. 255?? ?? ?? ?? ??? ???? ???? 0? ??? ?????.
?:
console.log(pixelData[3] < 255 ? 'Transparent' : 'Opaque');
? ??? ???? PNG ???? ?? ??? ????? ???? ????.
? ??? PNG ???? ???? ???? ??? ??????? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!

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??? ???? ??

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???? ?? ??? ??? ?? AI ?? ?

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???? ?? ???? ??? AI ?????.

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Java ? JavaScript? ?? ?? ????? ??? ?? ?? ?? ???? ????? ?????. Java? ??? ? ??? ?????? ??? ???? JavaScript? ?? ? ??? ??? ?????.

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