Yes, that's exactly what I would like to do. I need to do modification on pixel values directly. Like making the photo to grayscale or colorize it.
I found a Jpeg software decode/encode library. But it can only output 16-bit "Bitmap" object. I need something like a 24-bit Bitmap object so I can manipulate image pixel values directly.
Well, GIMP (www.gimp.org) is a free and very powerful image editing software capable of doing this and IrfanView (http://www.irfanview.com/) is a bit simpler tool that might also be valuable to you.
There are also commercial softwares like Paint Shop Pro and Photoshop.
You seem to be using Windows so you might also try the Paint that is shipped with most Windowses. It is a very simple image editign program that might help you. Also remember that jpeg is a lossy compression method and whenever you open a jpeg image, edit it and save again as a jpeg image you will lose some quality. In order to prevent this use lossless compression like PNG.
Paapaa
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