how to display two colours in one graph?

Hello everyone,

I first use cat() to define the color from RGB values and then I am trying to plot the colors of two differnet pixel one next to the other using image().

Any suggestions on how I can do that?

this is working for me but i would like to have them showing in the same graph and figure

Thank you in advance

figure
image(truecolor_image)
figure
image(truecolor_image1)
axis equal 

[Image Analyst]

I have no idea what you want to do. cat() does not define colors. And image() does not plot color values - it displays images. So I have no idea what you want as a "graph". Please mock up a picture and post it so we can figure out what you want.

[Seba.V]

Sorry I hope the picture makes a bit more sense.

I have the color of two pixels and i want to show them one next to the other instead of in two separate images.

Answer 1

[Image Analyst]

See Steve's blog:

https://blogs.mathworks.com/steve/2020/03/10/how-to-display-color-swatches/

Or else just do this:

imageHeight = 300;
% Create an image of all 1's.
blank = ones(imageHeight, 'uint8');
% Assign (or get) the two RGB values into a vector.
rgb1 = [0, 255, 255];
rgb2 = [255, 146, 0];
% Create two images.  One image for each color.
color1 = cat(3, rgb1(1) * blank, rgb1(2) * blank, rgb1(3) * blank);
color2 = cat(3, rgb2(1) * blank, rgb2(2) * blank, rgb2(3) * blank);
% Stitch them together into one image.
twoPixels = [color1, color2];
% Display that image.
imshow(twoPixels);