如何从javascript中的imageData生成图像？ [英] How to generate an Image from imageData in javascript?

问题描述

我想知道是否有任何方法从imageData创建一个新的图像，这是以前从一个画布元素获得？

I would like to know if there is any way to create a new Image from imageData, which was previously obtained from a canvas element?

我搜索过一个解决方案，但他们似乎都把结果画到画布上。
所以基本上我需要一个方法来将ImageData对象直接转换为Image。

I've searched for a solution, but they all seem to be drawing the result to a canvas. So basically I need a way to convert an ImageData object to Image directly, if its possible.

推荐答案

在Canvas中使用 toDataURL 方法。
它使图像数据作为数据URI。

You can use toDataURL method in Canvas. It makes a image data as Data URI.

var canvas = document.createElement("canvas");
canvas.width = 100;
canvas.height = 100;
var ctx = canvas.getContext("2d");
ctx.fillStyle = "red";
ctx.fillRect(0, 0, 100, 100);

var img = document.createElement("img");
img.src = canvas.toDataURL("image/png");
document.body.appendChild(img);

如果您想知道用户的浏览器支持Data URI Scheme，可以使用此函数。

If you want to know user's browser supports Data URI Scheme, You can use this function.

function useSafeDataURI(success, fail) {
    var img = document.createElement("img");

    img.onerror = function () {
        fail();
    };
    img.onload = function () {
        success();
    };

    img.src = "data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDIBKE0DHxgljNBAAO9TXL0Y4OHwAAAABJRU5ErkJggg=="; // insert a dot image contains 1px.
}

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