颜色减法 [英] Color subtraction

问题描述

除了彩色外，我有两个看起来相同的位图。是否有一种简单的减去的方法一个位图的颜色，逐个像素，所以

只剩下颜色的差异。例如，如果我在点（50,75）处取一个

像素，并且发现颜色分别是FF00FF和FF0000

，有没有办法确定剩余的颜色是

0000FF？


提前致谢！


祝福


Paul

-
http：/ /www.paullee.com

Hi,
I have two bitmaps that look the same, except in color. Is there a
simple way to "subtract" the color of one bitmap, pixel by pixel so
that only the difference in colour remains. For instance, if I take a
pixel at point (50,75), and find that the colours are FF00FF and FF0000
respectively, is there a way to determine that the residual colour is
0000FF ?

Thanks in advance!

Best wishes

Paul
--
http://www.paullee.com

推荐答案

在位图之间执行XOR应该

给你差异。

Performing an XOR between the bitmaps should
give you the difference.

所以类似于：


Bitmap3 .SetPixel（50,75，

Bitmap1.GetPixel（50,75）^ Bitmap2.GetPixel（50,75））;


如果我想要在第三个

位图中设置像素颜色等于这个差异？

So, something like:

Bitmap3.SetPixel(50,75,
Bitmap1.GetPixel(50,75)^Bitmap2.GetPixel(50,75));

if I wanted to set the pixel color equal to this difference in a third
bitmap?

pa ** @ paullee.com 写道：

我有除了颜色外，两个看起来相同的位图。是否有一种简单的方法来减去一个位图的颜色，逐个像素，所以只剩下颜色的差异。例如，如果我在点（50,75）处取一个
像素，并且发现颜色分别为FF00FF和FF0000，有没有办法确定残留的颜色是什么？ 0000FF？

Hi,
I have two bitmaps that look the same, except in color. Is there a
simple way to "subtract" the color of one bitmap, pixel by pixel so
that only the difference in colour remains. For instance, if I take a
pixel at point (50,75), and find that the colours are FF00FF and FF0000
respectively, is there a way to determine that the residual colour is
0000FF ?

目前尚不清楚两种颜色之间的区别是否可以用第三种颜色来表示
，但哟你想尝试一下

组件的绝对差异。也就是说，提取每个输入颜色的RGB分量

，找出差值r1-r2，g1-g2，b1-b2

（忽略符号），并使用那些构造输出颜色。不确定

输出的效果如何 - 亮度之间的区别是明亮的

红色FF0000和橙色FF8000最好用深绿色代表

008000？我想这是你的应用程序:)


-

Larry Lard

回复团体请

It''s not immediately clear that the difference between two colours can
be usefully represented by a third colour, but yo umight like to try a
component-wise absolute difference. That is, extract the RGB components
of each input colour, find the differences r1-r2, g1-g2, b1-b2
(ignoring sign), and use those to construct the output colour. Not sure
how useful the output will be though - is the difference between bright
red FF0000 and orange FF8000 really best represented by deep green
008000? I guess it''s your application :)

--
Larry Lard
Replies to group please

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