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I have Vista Business on my laptop. I download JPG pictures from my Nikkon camera. I open them with mspaint and resize them. Then save them back as jpg (using the jpg option). When I try to open the saved file, I get "Paint cannot read this file. This is not a valid bitmap file". When I preview it with windows photo gallery, I can see the picture. Any ideas?

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No idea on your issues but you really shouldn't resize images with Paint. Nearest neighbor resampling is ugly, to say the least. You can easily manage pictures and change their size with Windows Live Photo Gallery, though. – Joey Oct 18 '09 at 16:05
Use Paint.NET. It's free. – user3463 Oct 18 '09 at 16:13
up vote 5 down vote accepted

How are you saving them as .jpg ? Did you select JPEG in the file format options? (I believe paint defaults to .bmp, so you may have a .bmp save with a .jpg extension).

However, as people have already said in the comments, Paint is not a great program for any serious image editing tasks. A good free alternative is Paint.NET, it has most of Paint's ease of use, with a much larger feature set.

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I selected jpeg option – Samil Oct 18 '09 at 18:39
As it happens, even if you give a bmp a jpg extension it still opens fine in Paint. – MartW Oct 18 '09 at 21:50

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