Why the same data yielding different values?

2013 4 21
1 个回答
3 次查看（30 天）

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Code:
abc=reshape( rate, size(CoverImage));
imageasbytes = typecast(abc(:), 'uint8');
imwrite(abc, 'exchan.jpg');
ss=imread('exchan.jpg');
imageasbytes2 = typecast(ss(:), 'uint8');
Both
imageasbytes2 and imageasbytes are giving different values inspite of the fact that I wrote that data ;
when i read the same file, values changed.
Why are they giving different values??

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回答（1 个）

Walter Roberson
Walter Roberson 2013-4-21

1 个投票

The JPEG image format uses lossy compression unless you specifically ask for lossless compression.

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