How to create a gray scale image

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maria
maria 2013-11-29
评论： maria 2013-12-1
Hi, i want to create a gray scale image in matlab so I write a matrix 5x7 lets say A=[0 0 0 0 0 0 0; 80 80 80 80 80 80 80;200 200 200 200 200 200 200; 110 110 110 110 110 110 110; 160 160 160 160 160 160 160;255 255 255 255 255 255 255] . Then i use the imshow command and I expect an image where every row has a different intensity, the first black, the last white and the others with intermediate values. Instead of that i get a picture where only the first row is black and the rest of them are white. what am i doing wrong?

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Image Analyst
Image Analyst 2013-11-29
A is a double. Cast it to uint8:
imshow(uint8(A));
or else use [] if you want to keep A as a double:
imshow(A, []);
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Image Analyst
Image Analyst 2013-12-1
It's fine if it's a double. You'll get more accuracy that way. You only need to convert it to an integer if you want to do certain things, like store it in a standard image format.
maria
maria 2013-12-1
oh ok, thank you so much for your help :)

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