Red and Black mix

Discussion in 'Photoshop' started by Bill Newton, Aug 1, 2005.

  1. Bill Newton

    Bill Newton Guest

    I recently took some digital photographs at a wedding, and on producing the
    first printout from Photoshop 7 on my Epson 1270, I see the dark suits worn
    by the men are littered with scattered red pixels.

    I would be very grateful if one of you enthusiasts out there could offer me
    some advice as to what the cause of the problem is, and maybe how it could
    be rectified.

    Thanks in anticipation of a helpful response.

    Regards.

    Bill.
     
    Bill Newton, Aug 1, 2005
    #1
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  2. Bill Newton

    Owamanga Guest

    Any chance of a crop of a scan of the printout, so we can *see* what's
    going on.

    And, I'm guessing the red spots are *not* on the original image?
     
    Owamanga, Aug 1, 2005
    #2
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  3. Bill Newton

    Harry Limey Guest

    May be nothing to do with it!! but, when my black ink cartridge is on its
    way out, the first signs are dark red where it should be black!!
    Harry
     
    Harry Limey, Aug 1, 2005
    #3
  4. Bill Newton

    Bill Newton Guest

    Thanks for responding:) Unfortunately I'm the ultimate non- technical bod
    and I have no idea how to respond to what you ask.

    I can tell you that the red pixels are not obvious when viewing the photo on
    screen ........ they just appear in the printout. They're not huge spots, in
    fact they can be difficult to see, depending on the size of the photo
    printout, but they are there ............ and they do spoil the picture.

    Sorry to be so unknowledgable in trying to explain my problem, but I do
    appreciate you trying to help.

    Regards.

    Bill Newton.

    P.S I just went back to review my photo prior to posting this e-mail, and I
    magnified as far as possible one of the affected areas which was totally
    black, ( I thought) however at that magnification it became clear that a
    number of redish pixels were in fact dotted throughout all of the 'black'
    parts.

    I'm still confused though, the suits certainly had no red in them so I dont
    know where it's come from!

    Hope that helps you ........ to help me :)

    Bill.
     
    Bill Newton, Aug 1, 2005
    #4
  5. Bill Newton

    Owamanga Guest

    I think Harry's hit the nail on the head. Swap the black cartridge and
    see if that helps. After that do a nozzle check (an option in the
    printer setup dialog) to make sure the blacks are all firing.

    The reason it's laying down read is that nothing in your photo will be
    pure black, it'll be a very very dark shade of something. When the
    printer fails to drop black ink everywhere it intended, you get to see
    some of the underlying tints.
     
    Owamanga, Aug 1, 2005
    #5
  6. Bill Newton

    Bill Newton Guest

    I'll buy a new cartridge and try the swap to morrow.

    Many thanks to you and Harry for taking time out to respond.


    Fingers Crossed :))

    Regards.
    Bill.
     
    Bill Newton, Aug 1, 2005
    #6
  7. Bill Newton

    Bill Newton Guest


    Groan!!! I tried it out with a brand new original Epson cartridge, but the
    red pixel problem remains:-((

    Could the problem relate to my 'colour settings' I had a look at them but I
    didn't understand what I was supposed to insert in the appropriate boxes.

    I just this minute posted the same question on another photoshop group and I
    await any helpful suggestions.

    Thanks again for taking time to respond.

    Regards.

    Bill Newton
     
    Bill Newton, Aug 2, 2005
    #7
  8. Bill Newton

    Owamanga Guest

    Did you do a nozzle-check, how did that look?
     
    Owamanga, Aug 2, 2005
    #8
  9. Bill Newton

    Bill Newton Guest

    Yes, I did that and it looked perfect!

    Bill
     
    Bill Newton, Aug 2, 2005
    #9
  10. Bill Newton

    Owamanga Guest

    Damn. That's stumped me then.

    I wonder if it is just noise that just doesn't show up too much on the
    screen? Make a test image by cutting a strips from the jacket part of
    the image, and repeatedly paste it side by side into a new image. In
    Photohshop, try a couple of strips with a de-noise filter at different
    settings, one with a levels adjustment that pushes shadows towards
    deep black, and a control strip with nothing done to it. Print it and
    see if anything there helps the problem.

    I've all but given up on home-printing now. I send most of my digital
    stuff to www.mpix.com who do digital wet prints onto real professional
    grade photographic paper. Good if you live in the US. $0.29 for a 6x4,
    $1.99 for an 8x10. Hard to beat if you factor in the costs of paper,
    ink, printer, guillotine, mistakes, dried nozzles etc that
    home-printing brings.

    Disadvantage with mpix is that you need to batch up the print jobs,
    otherwise the post & packaging kills you. This means you might only
    order prints once every two months, so a fast turnaround isn't
    feasible. The quality however, is superb and the prints will last
    better than standard ink-jet stuff.
     
    Owamanga, Aug 2, 2005
    #10
  11. Bill Newton

    Bill Newton Guest

    Thanks for all your advice, it's greatly appreciated. I shall endeavour to
    do
    as you suggest below, although at first reading I barely understood any of
    it. That's my ignorance and I need to learn!!

    Many thanks for your time.

    Regards.

    Bill
     
    Bill Newton, Aug 2, 2005
    #11
  12. Bill Newton

    Owamanga Guest

    I can explain it in more detail - it's difficult to determine
    somebody's level of knowledge in Photoshop.

    The result I'm talking about would be similar to this traditional
    darkroom method of getting an exposure right:

    http://www.davidrichert.com/Moon and Shooting Stars 1.jpg

    ...except I'd probably cut & paste a strip from the original and repeat
    it, so that each strip starts off being identical. Then, one by one
    select the strip with a rubber-band box and apply different filters /
    adjustments to each strip so you can tell what works and what doesn't
    on the final print.

    Try these:

    Strip1: Filter/Noise/Despecle
    Strip2: Filter/Noise/Dust & Scratches: Rad 1, Thresh 120
    Strip3: Image/Adjustment/Levels Move the left hand black slider in
    towards the center of the graph. So the first number on the input
    levels box reads 30-40.
    Strip4: Leave it alone for comparison

    There are some good commercial de-noise plugins that will do a better
    job (Noise Ninja etc) but I expect you don't have these.

    On a separate tact, you might also want to try this:

    Zoom in on the suit part of the image, to 100% (View/Actual Pixels).

    Now choose Window/Channels from the menu so you can see the channels
    dialog. One by one, select the Red, Green and Blue channels and look
    to see if the red-dot pattern can be seen in the main window (it
    should appear as a black & white image). If this view lets you see the
    dots, you can now see when you've been successful in removing it
    without having to waste more paper doing test prints. You can also
    apply filters to just the one channel (probably the Red) that has the
    problem by having just that one channel selected before applying the
    filter.
     
    Owamanga, Aug 2, 2005
    #12
  13. Bill Newton

    KatWoman Guest


    yeah it is hard to help you out without knowing if this is a printing error
    or the dots are actually in the image itself.
     
    KatWoman, Aug 3, 2005
    #13
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