如何将RGB颜色转换为最接近的匹配8位颜色？ [英] How to convert an RGB color to the closest matching 8-bit color?

问题描述

我有一个应用程序可以对视频中显示的前16个颜色进行索引。

我试图编写另一个应用程序，允许用户选择颜色然后应用程序会找到该颜色出现的所有视频。

问题是，由于我每个视频只索引16种颜色，因此用户选择RGB颜色。

我想到了一种方法，我可以使这个工作 - 我可以索引

然后，当用户选择RGB颜色时，我可以将用户选择转换为相同的8位颜色

这种方式我总是有匹配。

现在是如何将RGB颜色转换为最接近的8位颜色？

解决方案

要转换为网络安全调色板，您需要将每个r，g，b组件的范围从0-255转换为0-5并组合它们：

  color =（r * 6/256）* 36 +（g * 6/256）* 6 +（b * 6/256）
  
I've an application that indexes the top 16 colors that appear in videos.

I'm trying to write another application that allows the user to select a color and then the application finds all videos that this color appears in.

The problem is that as I only index 16 colors per video, the users choose an RGB color. The probability that this color is indexed is very low, so almost always my application returns no results.

I thought of a way I could make this work - I could index the colors that appear in the video and convert them to closest 8-bit color.

Then when a user selects an RGB color, I could convert the user choice to the same 8-bit closest color.

This way I'd always have matches.

The only major problem I've right now is how to convert an RGB color to the closest 8 bit color?
解决方案
To convert to the web-safe palette, you need to convert the range of each of the r,g,b components from 0-255 to 0-5 and combine them:
color = (r*6/256)*36 + (g*6/256)*6 + (b*6/256)


                        
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