Why getting black image as output?

2020 5 18
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更新时间：2020 5 18
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I have 3 bands images.(tif). I try to open it but it look black. why? how can I open it colored?
I=imread('10030050.tif');
imshow(I)

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Walter Roberson
Walter Roberson 2020-5-18
What shows up for size(I) and class(I) and max(I(:)) ?
Merve YILDIRIM
Merve YILDIRIM 2020-5-18
>> size(I)
ans =
13824 7680 3
>> class(I)
ans =
'uint16'
>> max(I(:))
ans =
uint16
4095
Merve YILDIRIM
Merve YILDIRIM 2020-5-18
image is truecolor.

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Walter Roberson
Walter Roberson 2020-5-18

1 个投票

You are only using 1/16th of the possible data range.
Is = double(I)/4095;
imshow(Is)

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Merve YILDIRIM
Merve YILDIRIM 2020-5-18
ohh, thank you so much :))
so, does the quality of my image go bad?
Walter Roberson
Walter Roberson 2020-5-18
does the quality of my image go bad?
I am not sure what you mean, but probably not.
When you are using uint16 data, it is common that the "interesting" part of it is only a small range. But you have to figure out what that interesting area is for your purposes. imhist() can sometimes help with that
For example,
imshow(I, [2000 2400])
Merve YILDIRIM
Merve YILDIRIM 2020-5-18
Ok. I guess so, my data’ s size big so matlab is stoped. Error: memory Do you think so?
Walter Roberson
Walter Roberson 2020-5-18
Your image is not all that big, but if you were to be trying to compare every column to every other column, you could run out of memory.
Merve YILDIRIM
Merve YILDIRIM 2020-5-18
Ok, I see. Thank you so so much :)

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