I bought a Canon PIXMA MG6150 and i am new at ubuntu. With the drivers from Canon i got it running a as a printer, but i have problems using it as scanner. With the Canon drivers it runs under GIMP with Scangear MP. But i want to use XSANE or gscan2pdf and in these programs it doesn't work. They tell me that no devices are available. Can anyone help me?
Canon has chosen not to provide official support for Ubuntu, and this limits what you can do. You can't use it with gscan2pdf, for example.
To make a PDF of a scanned document:
Experiment with both the image scan quality, as well as the PDF export quality, to get a reasonably small PDF. I usually scan at 300dpi, then adjust the PDF export quality to get the best results.