How do I change image background to red

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Kirti
Kirti 2014-2-18
评论： Image Analyst 2018-9-20
I have an image with black background, which I got from imfreehand function. I want to change that black background to red. Following is link for image.
https://plus.google.com/photos/111799079095235591256/albums/5981777630894438081?hl=en_US&partnerid=gplp0

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Image Analyst
Image Analyst 2014-2-18
background = grayImage == 0; % Find black pixels.
redChannel = grayImage;
redChannel(background) = 255; % Set black pixels to max value.
% Create true color image.
rgbImage = cat(3, redChannel, grayImage, grayImage);
imshow(rgbImage); % Display it.
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Image Analyst
Image Analyst 2014-2-20
numberOfBackgroundPixels = sum(background(:)); % Red/white pixels in background.
numberOfROIPixels = numel(background) - numberOfBackgroundPixels;
Kirti
Kirti 2014-2-21
I got gray scale Image with red background as per your code. In next step of Image processing I want to binarize only region of Interest keeping red background as it is. but when I apply im2bw all image convert into black and white, even red background. So what is the solution for keeping red background as it is and convert gray image into binary

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更多回答（2 个）

Ravi Shekhar
Ravi Shekhar 2018-3-29
Hi, you can use following MATLAB code to change the color scheme of a gray image.
gray_image = imread('cameraman.tif');
map = colormap('autumn');
rgb_image = ind2rgb(gray_image,map);
You can get different color schemes under 'colormap' function in MATLAB.
hf fh
hf fh 2018-9-19
Please help me I have an image and I want to make the background color white I used the previous method but did not good out with me
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hf fh
hf fh 2018-9-20
To make sure there is no noise in the image and also make sure the edges of the image
Image Analyst
Image Analyst 2018-9-20
Making the surround white does not make sure there is no noise in the image. And you didn't finish the second part of the sentence about making sure the edges.....are what?

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