减少位图调色板中颜色数量的最佳方法 [英] The best way to reduce quantity of colors in bitmap palette

问题描述

我有一个位图，其中包含许多不同的颜色.但是我需要根据此图像设计一种40种或更少颜色的方案.这就是为什么我需要减少位图调色板中颜色数量的方法.

I have a bitmap which contains a lot of different colors. But I need to make a scheme from this image with 40 colors or less. That's why I need method to reduce quantity of colors in the bitmap palette.

我正在为我的应用使用以下代码:

I'm using code below for my app:

        using System.Windows.Media.Imaging; //BitmapSource

        ==================================================

        //Create palette of requied color. Pay heed to maxColorCount it 
        //can have any value, but PixelFormats supports only 2,4,16 and 256 colors.
        var myPalette = new BitmapPalette(ConvertBitmap(b) as BitmapSource, 16);

        newFormatedBitmapSource.DestinationPalette = myPalette;

        //Set PixelFormats
        newFormatedBitmapSource.DestinationFormat = PixelFormats.Indexed8;
        newFormatedBitmapSource.EndInit();

        b = BitmapFromSource(newFormatedBitmapSource);

它可以工作，但是通常我收到的图像是明亮的像素，而大多数像素是较深色的纯色背景:

It works, but very often as a result I recieve an image with bright pixels on a mostly solid background of darker colours:

我尝试自己做:获得最近的4或9像素(正方形)&混合它.我也尝试减小位图的大小并拉伸"位图.最后，我试图吸收最接近的颜色.但是我使用上面的方法获得了最好的结果.

I tried to do it by myself: get nearest 4 or 9 pixels (square) & blend it. Also I tried to reduce bitmap size and "stretch" the bitmap. In the end I was trying to absorb nearest colors. But the best result I got using method above.

这就是为什么我在寻找更好的方法来减少位图调色板中的颜色数量.

P.S.图像按比例缩放，我还在它们之上绘制了一个网格.

P.S. Images were scaled, and I also drew a grid on top of them.

已更新:

我尝试使用 scolorq ，但结果相同.问题仍然有意义.

I tried to use scolorq, but result was the same. Question still relevant.

推荐答案

可以使用此处.它实现了8种算法，并具有大量的选择.

A great app with source code in C# is available here. It implements 8 algorithms and has tons of options.

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