How to convert RGB gcf to grayscale gcf ?

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 ?

Answer 1

[KSSV]

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

[도현 김]

Thank you! But that and grayscale are different.

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

[KSSV]

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