How to convert RGB gcf to grayscale gcf ?

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도현 김
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 ?

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KSSV
KSSV 2021-3-29
h = rand(10)
heatmap(h) ;
colormap(gray)
  2 个评论
도현 김
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
KSSV 2021-3-29
If you have the values..you can striaght away use them with colormap. Read about it.

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