CSS ??? ???? ????? ??? ??
???? CSS ??? ????? ????? ?? ?? ???? ??? ?? ?? ?????. ? ??? ????? ? ?? ?? ?? ??? ????:
1. ???? ?? ?? ??(Firefox?? ??)
Firefox? CSS ??? ??? ????? ?? ??? ? ?? ???? ?? ??? ?????.
var ctx = myCanvas.getContext('2d');
ctx.filter = "grayscale(50%) blur(5px)";
ctx.drawImage(img, 0, 0, myCanvas.width, myCanvas.height);
??? ?? ??? ?????. ?? ?? ???? ???? ?????.
2. ???? ?? ??(?? ????)
???? ?? ??? ?? ???? ??? ?? ?? ??? ???? ???? ??? ???? ??? ? ????. ?? ???? ?? ?? ?? ?? 1? SVG ?? ? ?? ???? ??? ???? ???.
// Calculate filter matrix for grayscale
var greyMatrix = [
0.2126, 0.7152, 0.0722, 0, 0,
0.2126, 0.7152, 0.0722, 0, 0,
0.2126, 0.7152, 0.0722, 0, 0,
0, 0, 0, 1, 0
];
// Apply grayscale filter to canvas
var imgData = ctx.getImageData(0, 0, myCanvas.width, myCanvas.height);
for (var i = 0; i < imgData.data.length; i += 4) {
var r = imgData.data[i];
var g = imgData.data[i + 1];
var b = imgData.data[i + 2];
imgData.data[i] = imgData.data[i + 1] = imgData.data[i + 2] = (r * greyMatrix[0] + g * greyMatrix[1] + b * greyMatrix[2]);
}
ctx.putImageData(imgData, 0, 0);
????? ? ??? ?? ? ????? ?????.
? ?? ??? Firefox ?? ??? ????? ?? ?? ??? ?????. ??? ???? ??? ????? ??? ??? ??? ??? ???.
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