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PSD filesize too huge!!!

Posted: 2012-10-21T06:23:58-07:00
by jpeter
Hi, all
I convert a .jpg to .psd using the commandline: convert my.jpg my.psd.
my.jpg: 1240x1378, rgb, 1025kbTo my surprise, my.psd file size is 5014kb, while the saved output psd file by Adobe Photoshop CS6 is only 3447kb.
I tried with a larger jpg file whose dimesion is 7016x4866 (2180kb). In this case the result is more terrible.
psd file size: 8,975kb by PS, 100,019kb by IM
what is the reason?
what additional data is inserted into .psd when using IM?
how can i reduce the file size, similar to those of PS?
* already tried a lot of options (strip, ...), but not helpful.
Please help me!