清空筛选条件
清空筛选条件

plz tell me how to choose the colormap for converting a grayscale image to rgb

1 次查看（过去 30 天）
tawheed jan
tawheed jan 2013-11-6
回答： Image Analyst 2013-11-6
plz tell me how to choose the colormap for converting a grayscale image to rgb.

请先登录，再回答此问题。

回答（2 个）

Walter Roberson
Walter Roberson 2013-11-6
Arbitrarily.
IM = rand(64,64); %a grayscale image
image(IM);
colormap(gray(256)); %display it in gray
pause(5)
colormap(copper(256)); %copper colormap
pause(5)
colormap(hot(256)); %hot colormap
  3 个评论
显示 1更早的评论
Walter Roberson
Walter Roberson 2013-11-6
If you started out with a color image, converted it to grayscale, manipulated that grayscale image, and then want to convert the manipulated image back to the original coloring, then if the manipulation creates any grayscale value that was not already present, then you cannot do the conversion back.
If you converted an image to grayscale, used that grayscale to find a region of interest (ROI), and now want to find the original colors for the pixels within the ROI, then you do not convert the grayscale image back to color: instead you use the ROI to extract pixel values from the RGB image.

请先登录，再进行评论。

Image Analyst
Image Analyst 2013-11-6
You can get a list of predefined colormaps by looking at the colormap function in the help.
someColorMap = winter(256); % Or whatever one you want.
rgbImage = ind2rgb(grayImage, someColorMap);
But you don't need one if you want to create a gray RGB image. Just do:
rgbImage = cat(3, grayImage, grayImage, grayImage);

类别

在 Help Center 和 File Exchange 中查找有关 Colormaps 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