Now detects cover open and paper jam.
Also formalised the query packet which occurs during initialization.
Hopefully, we will be able to decode this for useful information.
Some devices can compress colour (JPEG) and also provide raw data
in uncompressed form. The two devices that I have supply raw data
not in RBG but in YCbCr form.
Now applications have the option to choose compressed or uncompressed
colour scans if supported by the device.
Cancel from the device by pressing STOP is now handled properly.
Ralph Little