如何更改图像的位图颜色 [英] How to change bitmap color of a image

问题描述

我正在使用Windows应用程序。

I am working on a windows application.

我有一个透明背景的图像。

I have a image with transparent background.

我想将图像的位图颜色从黑色更改为白色。

I want to change bitmap color of image from black to white.

为此目的，我写了一个小函数，看起来像这样：

For this purpose, I have written a little function, that looks like this:

public void colorImageChange()
{
    byte a = 255;
    StreamResourceInfo sri = Application.GetResourceStream(new Uri("Assets/Picto_1604_Panther_Black.png", UriKind.Relative));
    BitmapImage src = new BitmapImage();
    src.SetSource(sri.Stream);

    // Get WriteableBitmap
    WriteableBitmap bitmap = new WriteableBitmap(src);

    for (int x = 0; x < bitmap.Pixels.Length; x++)
    {
        byte[] actualColorValues = BitConverter.GetBytes(bitmap.Pixels[x]);
        byte[] modifiedColorValues = new byte[4];

        modifiedColorValues[0] = a;
        modifiedColorValues[1] = a;
        modifiedColorValues[2] = a;
        //modifiedColorValues[3] = a;

        //opacity
        modifiedColorValues[3] = actualColorValues[3];

        bitmap.Pixels[x] = BitConverter.ToInt32(modifiedColorValues, 0);
    }
    // Set Image object, defined in XAML, to the modified bitmap.
    ImageViewer1.Source = bitmap;
}

我可以改变图像的颜色，但我的问题是，图像的边缘不平滑。 

请帮帮我。

Please help me.

推荐答案

Hi Mars771，



如果你想创建一个处理图像的程序，请尝试使用
OpenCV 库。



如果你通过"C＃opencv background transparent"搜索，你会发现很多样本。其中一个....

如何从OpenCV android中的grabcut
输出图像中删除黑色背景？

HTTP：// answe rs.opencv.org/question/24463/how-to-remove-black-background-from-grabcut-output-image-in-opencv-android/?comment=24786#comment-24786



问候，

Hi Mars771,

If you want to create a program which handles images, please try to use OpenCV library.

If you search by "C# opencv background transparent", you will find many samples. One of them....
How to remove black background from grabcut output image in OpenCV android ?
http://answers.opencv.org/question/24463/how-to-remove-black-background-from-grabcut-output-image-in-opencv-android/?comment=24786#comment-24786

Regards,

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