Writing software for cameras

[jcolby]

I'm a developer and want to write a tool for my A70. I noticed that even after the gifs are transferred to the hard disk the file viewer that comes with the A70 displays all of the shot info. I assume it is stored in the JPG.

Does anyone know where to find a spec that would explain where this kind of thing is stored in the jpg file?

Does anyone know where to find a spec for talking to te camera via the usb? how to open communications, command structure etc.?

TIA

[CyberDyneSystems]

I wish I knew more,. about all I have to offer is that the info stored in the jpeg is often referred to as "Metadata" perhaps this will help in your search for info.

Many applications support metadata,. some do not. For instance,. a graphics app that does not support meta data will cause you too loose all the info stroed there if you edit and resave a file with metadata attached.

[jcolby]

Thanks, that was enough to get some c# programming hits on google. Now if I could just find info on the command structure and talking to the camera. I can break the project down into processing the jpg which I can do from files on the disk, then when / if I manage to talk to the camera I can move on.

Thanks again.

[Masabo]

Might be very helpful if you had access to Canon's SDK kit. Try this link:
http://www.powershot.com/powershot2/customer/develop1.html

[Jud Dagnall]

Sounds like you're talking about the EXIF metadata that is stored in the jpeg images. See www.exif.org for more details about the file format. There are also a number of existing open source packages in various languages for processing the EXIF data.