covert true colour image to gray

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Rakesh V
Rakesh V 2020-8-5
评论： Rakesh V 2020-8-10
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 个评论
per isakson
per isakson 2020-8-8
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 2020-8-10
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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回答（1 个）

Anmol Dhiman
Anmol Dhiman 2020-8-8
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 个评论
Rakesh V
Rakesh V 2020-8-10
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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