Matlab Imshow command does not show the same binary image with original

2015 12 14
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更新时间：2015 12 15
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I read the image with:
W=double(imread('rose32.bmp'));
Then: imshow(W,[]); or imshow(W);
But, Showed image seems to invert of original image. How Can I solve this problem ? It is a Matlab problem ?

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Walter Roberson
Walter Roberson 2015-12-14

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You are treating the image as if it is a binary or RGB image, but it is not: it is an index (pseudocolor) image. You can see this by using
iminfo('rose32.bmp')
and noticing the "ColorType: 'indexed'"
A proper way to display it:
[W,cmap]=imread('rose32.bmp');
image(ind2rgb(W,cmap))

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Mevlut Dogru
Mevlut Dogru 2015-12-14
编辑：Mevlut Dogru 2015-12-14
Below code running. But iminfo function do not working at Matlab 2010. Do you know of this reason ?
Mevlut Dogru
Mevlut Dogru 2015-12-15
for Gri Level image imfinfo('Lena.gif') command shows "ColorType: 'indexed'" is it true ?
Walter Roberson
Walter Roberson 2015-12-15
If the Colormap shows up as nonempty then it is a pseudo color image not a grayscale image. .gif are mostly pseudo color.

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