Why image appear black and white image?

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hla hla myint 2020-10-8

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https://ww2.mathworks.cn/matlabcentral/answers/608211-why-image-appear-black-and-white-image

评论： Rik 2020-10-9

i convert 3 d image to 2 d image. Then I have used the imwrite function. But image was appeared the black and white image. Why?

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Image Analyst 2020-10-9

在 MATLAB Online 中打开

What is the class of (the poorly-named) c? Is it double or uint8 or uint16?

You forgot to attach your file so we can't run your code.

You need to put v.jpg in single quotes otherwise it will think that v is a structure and the jpg field of that structure is a character array, which is not what I think it is.

imwrite(c, 'v.jpg');

Do not use JPG for image analysis - it introduces bad compression artifacts. Use PNG format instead.

imwrite(c, 'v.png');

What does this show in the command window

whos a
whos b
whos c

Rik 2020-10-9

"Do not use JPG for image analysis - it introduces bad compression artifacts. Use PNG format instead."

I whole-heartedly agree, but in medical imaging it appears to be common to convert perfectly good 12 bit precision DICOM files to JPEG. I don't understand why, but that seems to be the standard. Judging by the use of niftiread I assume this is a medical purpose as well, meaning this might just be conforming with the input requirements of the next step in the pipeline.

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