# How to configure xsane I/P device? (xsane v4l interface)

From: Lawrence Glaister (lg@jfm.bc.ca)
Date: Wed Sep 20 2000 - 11:55:03 PDT

- Next message: Henning Meier-Geinitz: "Re: backtracking problem"
  - Previous message: bob van der Poel: "xsane DOES NOT WORK"
  - In reply to: bob van der Poel: "xsane DOES NOT WORK"
  - Next in thread: Oliver Rauch: "Re: How to configure xsane I/P device? (xsane v4l interface)"
  - Reply: Oliver Rauch: "Re: How to configure xsane I/P device? (xsane v4l interface)"
  - Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

  I am using xsane 0.61 with 1.01/1.02/1.03 versions of sane.
  I have a web cam (Creative Labs webcam 3 USB) on one usb port and usb
  scanner (Agfa 1212u) on the other port.
  xscanimage correctly sees both devices and allows me to chose the input
  device.
  How do I get xsane to use the scanner instead of the webcam?

  - A second problem with xsane and the webcam is that yellow areas of the
  picture show up as blue. I suspect that xsane is expecting an rgb image, but
  most webcams return a bgr or is it gbr? It may be useful to add a v4l
  interface config that allows swapping the rgb components.

  - A third problem with the xsane v4l interface, is that it appears to be
  using the wrong buffer for pulling its data.... ie, the first preview gives
  a blank image (black) and the second attempt gives a correct image... this
  continues... the preview data is always 1 picture behind the last picture
  taken from the camera. I know the ov511 camera driver has 2 image buffers
  and toggles between them. This can probably be fixed with a v4l sync call.

  Is anyone else seeing similar problems?
  =======================================================
  Lawrence Glaister VE7IT email: lg@jfm.bc.ca
  1462 Madrona Drive http://jfm.bc.ca
  Nanoose Bay BC Canada
  V9P 9C9
  =======================================================

      --
      Source code, list archive, and docs: http://www.mostang.com/sane/
      To unsubscribe: echo unsubscribe sane-devel | mail majordomo@mostang.com

  - Next message: Henning Meier-Geinitz: "Re: backtracking problem"
  - Previous message: bob van der Poel: "xsane DOES NOT WORK"
  - In reply to: bob van der Poel: "xsane DOES NOT WORK"
  - Next in thread: Oliver Rauch: "Re: How to configure xsane I/P device? (xsane v4l interface)"
  - Reply: Oliver Rauch: "Re: How to configure xsane I/P device? (xsane v4l interface)"
  - Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

  This archive was generated by hypermail 2b29 : Wed Sep 20 2000 - 11:50:50 PDT