| 标题 | html5 更新图片颜色示例代码 |
| 范文 | 代码如下: <canvas id="c1" width="1220" height = "880"></canvas> <script> var cID = "c1"; var image = new Image(); image.src = "Eye/item_eye_1.png"; image.onload = function () { recolorImage(cID,image, 0, 0, 0, 255, 0, 0); } function recolorImage(c,img, oldRed, oldGreen, oldBlue, newRed, newGreen, newBlue) { var c = document.getElementById(c); var ctx = c.getContext("2d"); var w = img.width; var h = img.height; c.width = w; c.height = h; // draw the image on the temporary canvas ctx.drawImage(img, 0, 0, w, h); // pull the entire image into an array of pixel data var imageData = ctx.getImageData(0, 0, w, h); // examine every pixel, // change any old rgb to the new-rgb for (var i = 0; i < imageData.data.length; i += 4) { // is this pixel the old rgb? if (imageData.data[i] == oldRed && imageData.data[i + 1] == oldGreen && imageData.data[i + 2] == oldBlue) { // change to your new rgb imageData.data[i] = newRed; imageData.data[i + 1] = newGreen; imageData.data[i + 2] = newBlue; } } // put the altered data back on the canvas ctx.putImageData(imageData, 0, 0); } </script> |
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