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covert true colour image to gray

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Rakesh V
Rakesh V on 5 Aug 2020
Commented: Rakesh V on 10 Aug 2020
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,

  2 Comments

per isakson
per isakson on 8 Aug 2020
How did you use rgb2gray? rgb2gray isn't supposed to work the way you describe.
What does
which rgb2gray -all
return?
Rakesh V
Rakesh V on 10 Aug 2020
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,

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Answers (1)

Anmol Dhiman
Anmol Dhiman on 8 Aug 2020
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

  1 Comment

Rakesh V
Rakesh V on 10 Aug 2020
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.

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