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Why thumbnail png file is bigger after original png

I use png format picture file sometimes. It is OK when I upload the file into MovableType platform. I choose make thumbnail to 400px width from about 700px.
Perl ImageMagick engine will create thumbnail file. The blog software will generate html code and put into editor body.
Everything looks find. But the file size of thumbnail png is bigger than original png file.
Original png file: 700X505 49KB
Thumbnail png file: 400X288 78KB
Why is it bigger?

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