Matlab Help只寫了:

Quality:A number between 0 and 100; this parameter applies only if 'Compression' is 'jpeg'. Higher numbers mean higher quality (less image degradation due to compression), but the resulting file size is larger.
Default:75

卻不知道參數要怎麼設定
原來是這樣:

imwrite(imgA,filename,'Quality', 95);

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