32bits save as int32
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Hi there,
I have a 32bit tif image https://we.tl/t-H0WliT3O50 . This image is 'single' but Matlab assumes by default 32bit means int32 and when the image is open with imread() the image is binary. I would to read the image using grey scale. How can I do this? I´ve tried itconvert in double but the image is open as binary image.
Any help would be very much appreciated , thanks
8 个评论
Ameer Hamza
2020-6-14
编辑：Ameer Hamza
2020-6-14
In R2020a, MATLAB reads the image as uint32, and imshow shows it correctly as a grayscale image
img = imread('lh.average.CURVATURE.tif');
imshow(img);
Can you show the code to read the image? Also, can you show the output of
class(img)
where img is variable in which image is loaded.
Pamela Garcia
2020-6-14
编辑：Pamela Garcia
2020-6-14
Ameer Hamza
2020-6-14
Which MATLAB release are you using?
Pamela Garcia
2020-6-14
Ameer Hamza
2020-6-14
I am also using R2020a, and it reads the tiff image as uint32. Also, does the tiff and png files you shared corresponds to the same image?
Pamela Garcia
2020-6-14
Ameer Hamza
2020-6-14
This tiff file seems to have very unusual encoding. How did you generate the png file from the tiff file?
Pamela Garcia
2020-6-14
采纳的回答
Walter Roberson
2020-6-14
If you look at imfinfo() of the file, you can see that the headers say it is a collection of nine images with 32 bit signed integer. If it is intended to be single instead, then the metadata is wrong.
for IDX = 1 : 9
imgint32 = imread('lh.average.CURVATURE.tif','index',IDX);
imgsingle{IDX} = reshape(typecast(imgint32(:), 'single'), size(img32));
end
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