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change the exif in command line

Posted: 2007-09-06T02:09:17-07:00
by kymapuk
in command line:
convert t_img11.jpg -set "EXIF:WinXP-Author" TEST t_img11.jpg
identify -format "%[EXIF:WinXP-Author]" t_img11.jpg

why this command don't change this exif?
May i write wrong?