Picture resize with right resolution by using Photoshop CS3

I need resize a picture (Width: 227; Height: 150; Resolution: 72) to (WIdth: 551; Height: 174), but I don't what resolution should I input in Photoshop C3.  I have tried default resolution 72, but the picture looks not clear as original.

Please help.
rowfeiAsked:
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zemondConnect With a Mentor Commented:
you will have to purchase them but they are dirt cheap,
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zemondCommented:
if the image is going to be used for the screen then leave the res (dpi) at 72
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zemondCommented:
because you are trying to increase the size of the image, you will loose detail and the picture will loose quality
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callmecheezConnect With a Mentor Commented:
resolution is only if the dimensions are in cm or inches; and should match print output.
e.g laserjet - 600dpi
inkjet - 300dpi.

If its just for screen, trying resize - bicubic smoother
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rowfeiAuthor Commented:
Thanks, Zedmond.

I am really need some good electrnoc health record pictures, do you know where I can find some? I did google search but I don't see any one that I likes.

Thanks
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zemondCommented:
istockphoto.com
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bluefezteamConnect With a Mentor Commented:
Free photos, legitimate and cheaper than iStock (free is free) just watch for image restrictions, apart from that fill your boots.

http://www.sxc.hu/
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rowfeiAuthor Commented:
Thanks, all
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