MATLAB: How to convert RGB gcf to grayscale gcf

colormapgraygrayscaleheatmaprgbrgb2gray

h = rand(10)

heatmap(h)

i want to using 'rgb2gray' without using imread.

The mechanism I want is to create heatmap and set it in set(gcf,~~~~).

How can I do it ?

Best Answer

h = rand(10)
heatmap(h) ;
colormap(gray)

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MATLAB: Using gcf in functions

gcf is basically the handle to the last figure window that you actued upon or brought up. It is the "current" one that things will happen in unless you specify otherwise. I don't think figure(gcf+1) is a wise idea though, because gcf won't always be an integer. It may have some weird handle number like 178.372, especially if it was created by running an app built with GUIDE. Just say fh = figure; instead, and that will create a figure and pick a handle number for it automatically rather than you trying to force it to use some particular number.

MATLAB: How to create a white image

Try this to create a grayscale image:

whiteImage = 255 * ones(N, M, 'uint8');
imshow(whiteImage);

To create an RGB image, try this:

whiteImage = 255 * ones(480, 640, 3, 'uint8');
imshow(whiteImage);

Best Answer

Related Solutions

MATLAB: Using gcf in functions

MATLAB: How to create a white image

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