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how to convert rgb image to 11*92 grayscale image of type 'pgm' ?

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swathi
swathi 2013-12-19
回答： Image Analyst 2013-12-19
wen I try to conert an image using photo editor, the converted image size will b 112 92 3.. i.e. dimension wil b 3,, how can make it 1D?

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回答（2 个）

David Sanchez
David Sanchez 2013-12-19
First use
gray_image = rgb2gray(RGB_image);
The rescale the image:
B = imresize(gray_image, scale)
Take a look at
doc rgb2gray
doc imresize
The order of the operations can be reverse.
Image Analyst
Image Analyst 2013-12-19
% Convert to grayscale.
grayImage = rgb2gray(rgbImage);
% Resize to 11*92 or 112*92 (whatever is wanted), if necessary.
grayImage = imresize(grayImage, [112, 92]);
% Convert to pgm format disk file
imwrite(grayImage, 'myFile.pgm');

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