covert true colour image to gray

I have an image 768X1024X3 true colour in bmp, how do I convert to gray 768X1024 only. I used rgb2gray which converts to gray but still 768X1024X3, But it has to just 768X1024, because i need to further process the image,

[per isakson]

How did you use rgb2gray? rgb2gray isn't supposed to work the way you describe.

What does

which rgb2gray -all 

return?

[Rakesh V]

ff=imread('diffplane.tiff');

>> gg=rgb2gray(ff);

>> imshow(gg);

This did convert the true colour image to gray image.

If you have any doubts, please check with your truecolour image.

How to read red, green and blue elements of true colour image. please help me with the code,

Answer 1

[Anmol Dhiman]

Hi Rakesh,

Working on the example given in rgb2gray

RGB = imread('peppers.png'); % RGB
size(RGB) % It gives 384   512     3
I = rgb2gray(RGB); % It creates a new Image I which is grayscale , but RGB is not modified.
size(I) % It gives 384 512.

If you want to modify the same Image variable give

RGB = rgb2gray(RGB); % where RGB is name of the image variable

Incase you aface similar issue , attach your image file for further investigation.

Thanks,

Anmol Dhiman

[Rakesh V]

Hi Anmol,

It worked. thanks good, may be it was not doing it properly before.

how to get each red, green and blue values of true colur image.

can you tell me.