為了更改 HTML5 Canvas 元素上繪製的圖像的顏色,您可以嘗試執行以下程式碼。使用drawImage()方法 -
function display(img1, red, gr, bl) { //func to change color of image var canvas1 = document.createElement('canvas');//canvas element initialisation canvas1.width = img.width;//canvas width initialisation canvas1.height = img.height; //canvas height initialisation var ctx1 = canvas1.getContext('2d'); ctx1.drawImage(img, 0, 0); var myImg =ctx1.getImageData(0, 0, canvas1.width, canvas1.height); for (var t=0;t< myImg.data.length;t+=4) { myImg.data[t]= red | myImg.data[t]; myImg.data[t+1]= gr | myImg.data[t+1]; myImg.data[t+2]= bl | myImg.data[t+2]; } ctx1.putImageData(myImg,0,0); // Image data is adjusted according to context return c; },
以上是在HTML5畫布元素上繪製的影像的顏色改變的詳細內容。更多資訊請關注PHP中文網其他相關文章!