如何在UWP中使用彩色小偷

问题描述

我正在加载来自互联网的图像源，我需要这些图像占主导地位的颜色。例如图片，然后发现彩色小偷，但我听不懂。

I loading images source from internet and I need this images dominant color. Forexample this image and then found color thief but I cant understand.

我使用这种方法，但我认为这是错误的。

I using this method but I think it's wrong.

BitmapDecoder BMD = new BitmapDecoder("https://yt3.ggpht.com/-cYK4gMKhvV0/AAAAAAAAAAI/AAAAAAAAAAA/8znlvBw-Wos/s100-c-k-no-mo-rj-c0xffffff/photo.jpg");
var colorThief = new ColorThief();
await colorThief.GetColor(BMD);

我该怎么办？

推荐答案

需要参数。但是 BitmapDecode 不是按照您尝试的方式创建的。 BitmapDecoder 可以由根据方法，不能由Uri直接创建。因此，您首先需要一个 RandomAccessStream 对象。可以通过RandomAccessStreamReference 来完成.randomaccessstreamreference＃Windows_Storage_Streams_RandomAccessStreamReference_CreateFromUri_Windows_Foundation_Uri_ rel = nofollow noreferrer> RandomAccessStreamReference.CreateFromUri（Uri） ，然后打开并读取它。使用ColorThief的完整演示如下，您可以参考：

It is right that the GetColor method of ColorThief requires a BitmapDecoder parameter. But BitmapDecode is not created by the way you are trying. BitmapDecoder can be created by IRandomAccessStream according to CreateAsync() method, cannot be created directly by a Uri. So you need a RandomAccessStream object firstly. This can be done by creating a RandomAccessStreamReference by RandomAccessStreamReference.CreateFromUri(Uri), and then open and read it. A complete demo by using the ColorThief is as follows you can reference:

Uri imageUri = new Uri("https://yt3.ggpht.com/-cYK4gMKhvV0/AAAAAAAAAAI/AAAAAAAAAAA/8znlvBw-Wos/s100-c-k-no-mo-rj-c0xffffff/photo.jpg");
RandomAccessStreamReference random = RandomAccessStreamReference.CreateFromUri(imageUri);
using (IRandomAccessStream stream = await random.OpenReadAsync())
{
    //Create a decoder for the image
    var decoder = await BitmapDecoder.CreateAsync(stream);
    var colorThief = new ColorThief();
    var color = await colorThief.GetColor(decoder);
}

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