Change the intensity of blue in a .jpg

Hello, how do I change the blue intensity of a .jpg so that the new image is combination of rg and the new b. Thanks.

Answer 1

[Image Analyst]

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

% Now change the blue channel in whatever way you want.
blueChannel = whatever.........

% Then recombine into the new color image.
rgbImage = cat(3, redChannel, greenChannel, blueChannel);

[Billy]

I have tried the rgbIamge function, but an error keeps on popping up.

undefined function 'rgbImage' for input arguments of type 'char'.

Could you show me what I would have to do before using this function. Thanks

[Walter Roberson]

rgbImage is not a function. In the above, Image Analyst has used rgbImage as the example name where the name of your image array would go.

[Walter Roberson]

I already showed you how to do the calculation in your previous question http://www.mathworks.co.uk/matlabcentral/answers/54083-manipulate-rgb-values-for-an-image

[Billy]

Oh the IM is the same as this rgbImage. Thank you very much to the both of you, sorry for being redundant. One last question. How do I display this new image, I am not sure how I piece together your answer and the one I received here. Thanks again.

[Image Analyst]

blueChannel = uint8(single(blueChannel) + 255*BX/100);

Then recombine and show the final image:

imshow(rgbImage);

[Billy]

Thank You VERY Much. That saved a lot of headache.