How to convert RGB gcf to grayscale gcf ?

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도현 김 2021-3-29

评论： KSSV 2021-3-29

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 ?

KSSV 2021-3-29

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

도현 김 2021-3-29

编辑：도현 김 2021-3-29

Thank you! But that and grayscale are different.

Its size is (m*n*3 uint8) and grayscale is (m*n uint8).

KSSV 2021-3-29

If you have the values..you can striaght away use them with colormap. Read about it.

MATLAB Graphics Formatting and Annotation Colormaps

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

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