?I?=?imread（‘1.jpg‘）;?
[d1d2d3]?=?size（I）;?
if（d3?>?1）?
I?=?rgb2gray（I）;%如果是灰度圖就不用先變換?
end?
I?=?double（I）?/?255;?
I1?=?uint8（255?*?I?*?0.5?+?0.5）;?
imshow（I1）;imwrite（I‘test.jpg‘）?

?屬性????????????大小?????日期????時(shí)間???名稱
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?????文件??????39841??2010-05-06?16:42??論文代碼\matlab1.mat

?????文件????????202??2010-05-06?17:28??論文代碼\matlab2.m

?????文件????????107??2010-05-06?21:11??論文代碼\matlab3.m

?????文件????????611??2010-05-06?22:10??論文代碼\matlab4.m

?????文件???????1580??2010-05-09?22:04??論文代碼\matlab5.m

????..A.SH.?????86528??2010-05-09?22:10??論文代碼\Thumbs.db

?????文件??????20480??2010-05-09?22:11??論文代碼\說明.doc

?????目錄??????????0??2010-06-04?11:03??論文代碼

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???????????????149349????????????????????8