separate orange band and violet band from rgb image

in the context of serparate red , green and blue bands from RGB image

i need to method to separate orange band first and therefore separate violet band from RGB image

Answer 1

[Image Analyst]

There are no "bands" of violet and orange in an RGB image, only a red band, a green band, and a blue band. In fact computers cannot even display violet. They can display purple, but not violet. https://petapixel.com/2017/07/19/photos-may-colors-screens-cant-display/

That said, you can extract orange and purple colors from your image. Simply use the Color Thresholder app on the Apps tab of the tool ribbon. Use HSV color space and then click the Export button to generate the function.

[Ghg]

dear image analyst

can insert values of RGB band to obtain purple and orange band

as it show in this picture showing rgb bands to form purple and orange

[Image Analyst]

Yes, that is correct. You can display purple and orange. And you can assign that color to existing pixels of an image.

[Ghg]

Can you take me the code

[Image Analyst]

Looks like you have not taken the on-ramp training. You need to do that.

% Specify the number of rows and columns you want in the image
rows = 25;
columns = 45;
% Make an image
rgbImage = zeros(rows, columns, 3, 'uint8'); % A 3-D array
% Assign certain values to the red, green, and blue channels
rgbImage(:, :, 1) = 191; % Assign a red value to all the pixels.
rgbImage(:, :, 3) = 255; % Assign a blue value to all the pixels.
% Display image
imshow(rgbImage);
axis('on', 'image')

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[Ghg]

Thank you dear But I want code for purple color on image Like this bands In picture (990uu.jpg) I sented, I will wait for you, my dear

[Image Analyst]

Try setting the green channel to zero to make the image look magneta (purple)

rgbImage(:, :, 2) = 0;

[Ghg]

dear

i want to separate purple on original that i am uploaded to matlab

like this yellow band on original image but i need to purple band on this original image

[DGM]

What is your actual goal? I have to ask, because the example you're giving isn't what you say you want. If you isolate the components of a color image, the results aren't color images anymore.

That magenta-ish and yellowish image are just the original image multiplied by [254 0 254] and [254 254 0] -- or at least that's as close as I can back-estimate from a JPG.

If what you want is to do a multiply blend on the image like that, then it's still not really clear why you're asking how to do it, because you clearly have already done it.

Are you asking how to do it with [191 0 255] or some other color instead?

inpict = imread('990uu.png');

FG = [0.6 0.3 1]; % pick a unit-scale tuple
outpict = im2double(inpict).*permute(FG,[1 3 2]);
outpict = im2uint8(outpict); 

imshow(outpict,'border','tight')

[Ghg]

thank so much dear DMG