imshow() displays a white image for a grey image
I have computed an image with values between 0 and 255. When I use imageview(), the image is correctly displayed, in grey levels, but when I want to save this image or display it with imshow, I have a white image, or sometimes some black pixels here and there:
Whereas with imageview():
Can some one help me?
matlab imageview imshow
asked Mar 15 '14 at 19:52
user3314570
117112
add a comment |
I have computed an image with values between 0 and 255. When I use imageview(), the image is correctly displayed, in grey levels, but when I want to save this image or display it with imshow, I have a white image, or sometimes some black pixels here and there:
Whereas with imageview():
Can some one help me?
matlab imageview imshow
asked Mar 15 '14 at 19:52
user3314570
117112
2
i don't work with matlab but i have faced such problem once. Try to useimshow(uint8(image));
– skm
Mar 15 '14 at 19:56
My saviour! It works! Thank you
– user3314570
Mar 15 '14 at 20:00
1
if it worked, pls accept my answer :)
– skm
Mar 15 '14 at 20:05
@skm how do I accept? :)
– user3314570
Mar 16 '14 at 13:07
you have already accepted another answer...may be, juts "vote up" my answer by clicking the "up arrow" for my answer (not comment)
– skm
Mar 16 '14 at 14:44
add a comment |
I have computed an image with values between 0 and 255. When I use imageview(), the image is correctly displayed, in grey levels, but when I want to save this image or display it with imshow, I have a white image, or sometimes some black pixels here and there:
Whereas with imageview():
Can some one help me?
matlab imageview imshow
asked Mar 15 '14 at 19:52
user3314570
117112
I have computed an image with values between 0 and 255. When I use imageview(), the image is correctly displayed, in grey levels, but when I want to save this image or display it with imshow, I have a white image, or sometimes some black pixels here and there:
Whereas with imageview():
Can some one help me?
matlab imageview imshow
matlab imageview imshow
asked Mar 15 '14 at 19:52
user3314570
117112
asked Mar 15 '14 at 19:52
user3314570
117112
asked Mar 15 '14 at 19:52
user3314570
117112
asked Mar 15 '14 at 19:52
user3314570
117112
asked Mar 15 '14 at 19:52
user3314570
117112
117112
2
i don't work with matlab but i have faced such problem once. Try to useimshow(uint8(image));
– skm
Mar 15 '14 at 19:56
My saviour! It works! Thank you
– user3314570
Mar 15 '14 at 20:00
1
if it worked, pls accept my answer :)
– skm
Mar 15 '14 at 20:05
@skm how do I accept? :)
– user3314570
Mar 16 '14 at 13:07
you have already accepted another answer...may be, juts "vote up" my answer by clicking the "up arrow" for my answer (not comment)
– skm
Mar 16 '14 at 14:44
add a comment |
2
i don't work with matlab but i have faced such problem once. Try to useimshow(uint8(image));
– skm
Mar 15 '14 at 19:56
My saviour! It works! Thank you
– user3314570
Mar 15 '14 at 20:00
1
if it worked, pls accept my answer :)
– skm
Mar 15 '14 at 20:05
@skm how do I accept? :)
– user3314570
Mar 16 '14 at 13:07
you have already accepted another answer...may be, juts "vote up" my answer by clicking the "up arrow" for my answer (not comment)
– skm
Mar 16 '14 at 14:44
2
2
i don't work with matlab but i have faced such problem once. Try to use
imshow(uint8(image));– skm
Mar 15 '14 at 19:56
i don't work with matlab but i have faced such problem once. Try to use
imshow(uint8(image));– skm
Mar 15 '14 at 19:56
My saviour! It works! Thank you
– user3314570
Mar 15 '14 at 20:00
My saviour! It works! Thank you
– user3314570
Mar 15 '14 at 20:00
1
1
if it worked, pls accept my answer :)
– skm
Mar 15 '14 at 20:05
if it worked, pls accept my answer :)
– skm
Mar 15 '14 at 20:05
@skm how do I accept? :)
– user3314570
Mar 16 '14 at 13:07
@skm how do I accept? :)
– user3314570
Mar 16 '14 at 13:07
you have already accepted another answer...may be, juts "vote up" my answer by clicking the "up arrow" for my answer (not comment)
– skm
Mar 16 '14 at 14:44
you have already accepted another answer...may be, juts "vote up" my answer by clicking the "up arrow" for my answer (not comment)
– skm
Mar 16 '14 at 14:44
add a comment |
2 Answers
2
active
oldest
votes
Matlab expects images of type double to be in the 0..1 range and images that are uint8 in the 0..255 range. You can convert the range yourself (but change values in the process), do an explicit cast (and potentially loose precision) or instruct Matlab to use the minimum and maximum value found in the image matrix as the white and black value to scale to when visualising.
See the following example with an uint8 image present in Matlab:
im = imread('moon.tif');
figure; imshow(im);
figure; imshow(double(im));
figure; imshow(double(im), );
figure; imshow(im2double(im));
answered Mar 15 '14 at 22:20
Maurits
1,83932330
add a comment |
I think that you should use imshow(uint8(image)); on the image before displaying it.
answered Mar 15 '14 at 19:54
skm
2,60142560
add a comment |
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2 Answers
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2 Answers
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active
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active
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Matlab expects images of type double to be in the 0..1 range and images that are uint8 in the 0..255 range. You can convert the range yourself (but change values in the process), do an explicit cast (and potentially loose precision) or instruct Matlab to use the minimum and maximum value found in the image matrix as the white and black value to scale to when visualising.
See the following example with an uint8 image present in Matlab:
im = imread('moon.tif');
figure; imshow(im);
figure; imshow(double(im));
figure; imshow(double(im), );
figure; imshow(im2double(im));
answered Mar 15 '14 at 22:20
Maurits
1,83932330
add a comment |
Matlab expects images of type double to be in the 0..1 range and images that are uint8 in the 0..255 range. You can convert the range yourself (but change values in the process), do an explicit cast (and potentially loose precision) or instruct Matlab to use the minimum and maximum value found in the image matrix as the white and black value to scale to when visualising.
See the following example with an uint8 image present in Matlab:
im = imread('moon.tif');
figure; imshow(im);
figure; imshow(double(im));
figure; imshow(double(im), );
figure; imshow(im2double(im));
answered Mar 15 '14 at 22:20
Maurits
1,83932330
add a comment |
Matlab expects images of type double to be in the 0..1 range and images that are uint8 in the 0..255 range. You can convert the range yourself (but change values in the process), do an explicit cast (and potentially loose precision) or instruct Matlab to use the minimum and maximum value found in the image matrix as the white and black value to scale to when visualising.
See the following example with an uint8 image present in Matlab:
im = imread('moon.tif');
figure; imshow(im);
figure; imshow(double(im));
figure; imshow(double(im), );
figure; imshow(im2double(im));
answered Mar 15 '14 at 22:20
Maurits
1,83932330
Matlab expects images of type double to be in the 0..1 range and images that are uint8 in the 0..255 range. You can convert the range yourself (but change values in the process), do an explicit cast (and potentially loose precision) or instruct Matlab to use the minimum and maximum value found in the image matrix as the white and black value to scale to when visualising.
See the following example with an uint8 image present in Matlab:
im = imread('moon.tif');
figure; imshow(im);
figure; imshow(double(im));
figure; imshow(double(im), );
figure; imshow(im2double(im));
answered Mar 15 '14 at 22:20
Maurits
1,83932330
answered Mar 15 '14 at 22:20
Maurits
1,83932330
answered Mar 15 '14 at 22:20
Maurits
1,83932330
answered Mar 15 '14 at 22:20
Maurits
1,83932330
1,83932330
add a comment |
add a comment |
I think that you should use imshow(uint8(image)); on the image before displaying it.
answered Mar 15 '14 at 19:54
skm
2,60142560
add a comment |
I think that you should use imshow(uint8(image)); on the image before displaying it.
answered Mar 15 '14 at 19:54
skm
2,60142560
add a comment |
I think that you should use imshow(uint8(image)); on the image before displaying it.
answered Mar 15 '14 at 19:54
skm
2,60142560
I think that you should use imshow(uint8(image)); on the image before displaying it.
answered Mar 15 '14 at 19:54
skm
2,60142560
edited Mar 15 '14 at 20:07
answered Mar 15 '14 at 19:54
skm
2,60142560
answered Mar 15 '14 at 19:54
skm
2,60142560
answered Mar 15 '14 at 19:54
skm
2,60142560
2,60142560
add a comment |
add a comment |
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2
i don't work with matlab but i have faced such problem once. Try to use
imshow(uint8(image));– skm
Mar 15 '14 at 19:56
My saviour! It works! Thank you
– user3314570
Mar 15 '14 at 20:00
1
if it worked, pls accept my answer :)
– skm
Mar 15 '14 at 20:05
@skm how do I accept? :)
– user3314570
Mar 16 '14 at 13:07
you have already accepted another answer...may be, juts "vote up" my answer by clicking the "up arrow" for my answer (not comment)
– skm
Mar 16 '14 at 14:44