Hi, I am hoping to garner some opinions about an issue that I am having with testing a Canon imageClass machine with the pixma backend.
I have an imageClass MF4770N machine that has always been a little problematic on the ADF and I have never really understood why. With Rolf we managed to get the machine fairly well supported but sometimes the machine would fail with a service code and abort requiring a power-cycle. I recently managed to track down the specific behaviour that caused this issue but I am not sure how to deal with it. When scanning on the ADF, if the user selects a scan area that is aligned to both the hard left and hard right of the scan area, then the machine scans OK. However, if the selection is away from the left area, the selection can not extend within 32 pixels of the right hand side. Within that restriction, I can scan whatever I want. In order to scan a selection that aligns with the right hand side, the select must align with the left hand side also. This, I think is a bug in the machine's firmware. I just checked and it is fully up-to-date so it looks like there are no fixes coming. On Windows, when using the ADF, one can only select a fixed media type that is centred in the scan area. One cannot arbitrarily select a scan area. So it is not possible to see what the Windows driver would do because the scenario is impossible. My problem is how to deal with the issue in the Pixma backend. The common scan scenario in ADF is to scan Letter media which is a full width scan. I cannot just make the maximum width 32 pixels less to avoid the problem. In 75dpi, 32 pixels is a significant chunk to miss from the right hand side. Any ideas? Cheers, Ralph
