不确定是否可行,但希望编写一个脚本来返回图像的平均值hex或rgb值。我知道可以在AS中完成,但希望在JavaScript中完成。
hex
rgb
AFAIK,做到这一点的唯一方法是<canvas/>…
<canvas/>
请注意,这仅适用于相同域中的图像以及支持HTML5 canvas的浏览器:
function getAverageRGB(imgEl) { var blockSize = 5, // only visit every 5 pixels defaultRGB = {r:0,g:0,b:0}, // for non-supporting envs canvas = document.createElement('canvas'), context = canvas.getContext && canvas.getContext('2d'), data, width, height, i = -4, length, rgb = {r:0,g:0,b:0}, count = 0; if (!context) { return defaultRGB; } height = canvas.height = imgEl.naturalHeight || imgEl.offsetHeight || imgEl.height; width = canvas.width = imgEl.naturalWidth || imgEl.offsetWidth || imgEl.width; context.drawImage(imgEl, 0, 0); try { data = context.getImageData(0, 0, width, height); } catch(e) { /* security error, img on diff domain */ return defaultRGB; } length = data.data.length; while ( (i += blockSize * 4) < length ) { ++count; rgb.r += data.data[i]; rgb.g += data.data[i+1]; rgb.b += data.data[i+2]; } // ~~ used to floor values rgb.r = ~~(rgb.r/count); rgb.g = ~~(rgb.g/count); rgb.b = ~~(rgb.b/count); return rgb; }