清空筛选条件
清空筛选条件

How to obtain sum of RGB color values of a pixel?

2 次查看（过去 30 天）
Anushka
Anushka 2015-5-27
评论： John D'Errico 2015-5-27
How to obtain sum of RGB color values of a pixel?
Without using I(:,:,1) ,I(:,:,2),I(:,:,3).
  1 个评论
Stephen23
Stephen23 2015-5-27
编辑：Stephen23 2015-5-27
It is important to note that the sum of the R, G, and B values is not the same as the grayscale! This is because each of the R, G, and B values contribute unequally to the luminance, so they cannot be simply summed to get the grayscale equivalent of a color pixel. If you want the grayscale value, then the easiest way is to use rgb2gray.

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Titus Edelhofer
Titus Edelhofer 2015-5-27
Hi,
something like
sum(I, 3)
?
Titus
  3 个评论
显示 1更早的评论
Titus Edelhofer
Titus Edelhofer 2015-5-27
Hi,
what do you mean b "not properly". Was there an error? Result not as expected (see comment by Stephen on grayscale)?
Titus
John D'Errico
John D'Errico 2015-5-27
Probably the image is uint8, so summing the pixels will overflow. Better might be
sum(double(I),3)

请先登录，再进行评论。

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Image Arithmetic 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by