Problem with colormap!

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Nguyen Tan Duoc
Nguyen Tan Duoc 2015-8-15
评论： Image Analyst 2015-8-21
I have a CT image (a matrix 512 x 512) that has maximum value is 2062 and minimum ones is 64. I want to show it so that the maximum pixel get white and the minimum ones get black color. I tried to use function colormap(C), with C=[a a a], a=[0:1/2000:1]'.Then used function image (CT)to show it. I imagined a color bar that begin with black (at 1) and change along with shade value to white (at 2062 or less than that a little). But i got a figure with weird color bar. It's discrete and just black and gray like the attached image (hadn't used function image(CT) yet). I'm wondering what's wrong!

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Walter Roberson
Walter Roberson 2015-8-15
This of course has nothing to do with the CT image; the question could have been posed without mentioning it.
On OS-X it looks fine:
My speculation is that you are using MS Windows and using a release before R2014b. Before R2014b, MATLAB on MS Windows only supported 256 entries in the color map. I am told that from R2014b onwards that the limit is substantially higher.
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Nguyen Tan Duoc
Nguyen Tan Duoc 2015-8-21
Thanks everybody!that's great answer.
Image Analyst
Image Analyst 2015-8-21
You're welcome. Hopefully your final decision was to use imshow() and not image() with that colormap you tried to create.

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更多回答（1 个）

Image Analyst
Image Analyst 2015-8-15
Don't use image(). Use imshow():
imshow(CT, []); % Be sure to use [].
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Image Analyst
Image Analyst 2015-8-15
Then how did you display the image?
Nguyen Tan Duoc
Nguyen Tan Duoc 2015-8-20
编辑：Nguyen Tan Duoc 2015-8-20
I would display CT. But it was too weir with that color bar.

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