I have an rgb image how can i select the blue color plane from the RGB color space?

i have this code but it show the error

redPlane1 =rgbImage1(:, :, 1);
greenPlane1 = rgbImage1(:, :, 2);
bluePlane1 = rgbImage1(:, :, 3);
rgbImage2(:, :, 3) = bluePlane1;
bluePlane1 = rgbImage1(:, :, 3);
bluePlane2 = rgbImage2(:, :, 3);
averageBlue = (double(bluePlane1) + double(bluePlane2)) / 3.0;
rgbImage2(:, :, 3) = uint8(averageBlue);

Answer 1

[Star Strider]

What was the error?

One problem is that I do not see that you have defined ‘averageBlue’ in the code you posted. Did you intend:

averageBlue = (double(bluePlane1) + double(bluePlane2)) / 3.0;

If not, please copy all the red text from the Command Window and paste it to a Comment to your Question here.

Answer 2

[Image Analyst]

What's with the char() function????? Try this:

% Extract the individual red, green, and blue color channels.
redChannel = rgbImage(:, :, 1);
greenChannel = rgbImage(:, :, 2);
blueChannel = rgbImage(:, :, 3);

You define the averageGreen to be 2/3 the blue channel of your image 1, but you don't every use it. Then you try to use averageBlue which has not been defined yet.

[cristin]

sorry it was error typing

[Image Analyst]

So what's the problem now? It does what you tell it to do, but I don't know what you want it to do. What do you want?