The sky with lines

Discussion in 'UK Photography' started by D.M. Procida, Mar 7, 2010.

  1. D.M. Procida

    D.M. Procida Guest

    I'm trying to print out an image.

    The lighter parts of the sky have an irritating series of darker lines
    across them; the lines match the path of the print head across the
    paper.

    <http://emberapp.com/evildmp/images/scan-1/sizes/o>

    The lines are almost exactly 1mm apart in the actual print. In this
    cropped section of a photograh, they are horizontal and disappear
    towards the top of the image.

    I don't think that the problem is a blocked head, because a test print
    shows no problems of that kind. Also the problem is dark lines, not
    missing lines, so I think it's an alignment problem, where the printer
    is overprinting in stripes.

    At the moment I'm just wasting paper and ink trying to troubleshoot
    this.

    The printer is a Canon MP970.

    Any suggestions?

    Thanks,

    Daniele
     
    D.M. Procida, Mar 7, 2010
    #1
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  2. D.M. Procida

    Rob Morley Guest

    On Sun, 7 Mar 2010 16:53:19 +0000
    If the print driver is doing "fit to page" resizing then try turning it
    off and resizing/resampling the image in your editing software instead.
     
    Rob Morley, Mar 7, 2010
    #2
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  3. D.M. Procida

    D.M. Procida Guest

    It isn't doing any such resizing that I can tell.

    Daniele
     
    D.M. Procida, Mar 7, 2010
    #3
  4. D.M. Procida

    Geoff Berrow Guest

    On Sun, 7 Mar 2010 16:53:19 +0000,

    The only time I've seen something like this is when printing at higher
    speed/lower quality.

    At higher quality the print head 'feathers' the printing to reduce the
    banding effect.

    I'm sure you have experimented with different settings so the only
    thing I can suggest is that it isn't working properly on your printer.
     
    Geoff Berrow, Mar 8, 2010
    #4
  5. I'm not at all sure what's going on but there is a similar looking effect
    known, I think, as "swathing" related to wet stuff applied in bands which
    has problems on the boundaries between the passes. I've come across it it
    in the manufacture of high-end projection screens but I think the spray
    painting guys (eg. the robots which paint cars etc) suffer too.

    As an experiment try setting the paper type to "other glossy" or
    "transparency" or somesuch which should give a much slower print as the ink
    is allowed to dry between passes.
     
    Calvin Sambrook, Mar 8, 2010
    #5
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