how can I generate a grayscale image with the triangle having an intensity value of 22 and the background having an intensity value of 229.

[Nosipho Majola]

Answer 1

[Voss]

A = imread('image.png'); % image.png is the image posted, which is a logical array
A_out = zeros(size(A),'uint8'); % greyscale output image -> 2-D uint8
A_out(~A) = 229; % background = 229
A_out(A) = 22; % foreground = 22
% A_out is the requested output image
imwrite(A_out,'image_out.png'); % write it to file if you like

[Nosipho Majola]

it says there is an error in A_out(A) = 22;

[Voss]

What is the error?

[Voss]

Try changing that line to:

A_out(logical(A)) = 22;

[Nosipho Majola]

Got the required image, thank you for your help

[Voss]

Great, no problem. Please mark my answer as accepted, if you don't mind.

[Nosipho Majola]

many thanks, marked.