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I took some pictures from my Nikon 5000 Camera and uploaded them to Google Picasa. Picasa decreased the resolution of the image while uploading and now I have lost the originals.

Is there any free software I can use to increase the resolution of the images? Here is the information about one of the images:

ul 23, 2010
1338×1193 pixels – 98KB
Filename: DSC_0017.JPG
Camera: NIKON CORPORATION
Model: NIKON D5000
ISO: 200
Exposure: 1/200 sec
Aperture: 8.0
Focal Length: 55mm
Flash Used: Yes
Latitude: n/a
Longitude: n/a
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Please don't use signatures or taglines in your posts. superuser.com/faq – Hello71 Jul 26 '10 at 16:05
up vote 12 down vote accepted

You can enlarge them, but once the high-resolution data are gone, they are just plain gone. Enlarging them generally won't produce good looking pictures.

Irfanview can enlarge them for you. http://www.irfanview.com/

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Thanks Adam S!! Well... lesson learned to always make a backup of the originals and do not rely on Picasa. – user13997 Jul 26 '10 at 16:07
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If you'd still like to try an enlarge using IrfanView, don't use the default setting (which I think is linear) but take the slowest one (Lancozs). It makes a much smoother image than the other method, but it still won't be as sharp as the original. – rumtscho Jul 26 '10 at 16:14
    
My original image was 1338×1193 pixels (306KB) and I changed to 5000 X 4459 (6MB). The website where I am trying to upload has the requirement for 4.25 MB (2400 X 1800). What am I missing? – user13997 Jul 26 '10 at 16:44
    
I do not think I should go with 5000 X 4459 since it will be extremely huge. When I set 2400 X 1800 in IrfanView the size comes as 2.4MB. – user13997 Jul 26 '10 at 16:47
    
Also, what I am doing with IrfanView will be considered Upsizing the photo and the website (shutterstock) clearly says not to upsize more than 5 percent or account will be suspended. – user13997 Jul 26 '10 at 16:50

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