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Thread: Best angle in Ctp plates

  1. #16
    Junior Member Pavlo is on a distinguished road
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    Cyan=15 Magenta=45 Yellow=0 Black=75
    175 Lpi 2400 Dpi/






    zuz already post same thing
    don't flood thread Super Silja
    Last edited by super silja; 08-29-2011 at 01:30 PM.

  2. #17
    Donor dejanzl is on a distinguished road
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    rousette

    C 15° 15° 105°
    M 75° 45° 75°
    Y 0° 0° 90°
    K 45° 75° 15°

    great text
    @super silja
    http://www.heidelberg.com/corp/www/binaries/bin/files/dotcom/en/prinect/expert_guide_screening_tech.pdf

    i use heidelberg color angle model
    Y 0
    K 45
    C 105 (90+15)
    M 165 (90+75)
    You can use any combination, taking into account that the angle between color must be 30 degrees.
    This is a good color scheme with yellow moiré builds with every color but because of poor visibility yellow color that can be ignored, and finally use spectrophotometer and you will receive same result for color whatever the combination of angle you are use.

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  4. #18
    PRC Member indra1 is on a distinguished road
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    Quote Originally Posted by dejanzl View Post
    i use heidelberg color angle model
    Y 0
    K 45
    C 105 (90+15)
    M 165 (90+75)
    You can use any combination, taking into account that the angle between color must be 30 degrees.
    This is a good color scheme with yellow moiré builds with every color but because of poor visibility yellow color that can be ignored, and finally use spectrophotometer and you will receive same result for color whatever the combination of angle you are use.
    I believe this is the safest angle combination to use. For non-symmetrical screening such as elliptical, a 60 degrees difference between dominant color (C, M, K) is required to achieve smooth rosette formation.

  5. #19
    Junior Member shiv is on a distinguished road
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    c-15
    M-45
    y-0
    k- 75 is our preference

    Min there should be 30deg diff between each colours to avoid moire but since there are 4colours we need to compromise some where so we choose yellow to be at zero as this is the least visible colour and then we put cyan at 15 deg. At 45 degrees the zagged formations at the edges are not visible so its best to use 45angle for single colour jobs.

    Most jobs containing photos have more magenta than black so 45deg is prefered to magenta than for black in 4 colour jobs

  6. #20
    Member haralampie64 will become famous soon enough haralampie64 will become famous soon enough
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    Prinergy Evo

    Y 0
    K 45
    C 165
    M 105
    ........150 lpi (175 lpi)

  7. #21
    Donor Shap will become famous soon enough
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    Swapping screen angles is helpful sometimes

    For highest quality reproduction it was common practice years before digital screening, not to adhere to a fixed angle per color, but to examine each picture and decide on the best screen angles according to the specific image content.
    As a general rule, the two most dominant colors were placed 60 degrees apart, regardless of the color, especially for Duotones and Tritones.
    Since objectionable patterning caused by Yellow moire was a real problem in some images, in images that had a lot of Yellow and very little information in the Black separation, angles of the Y and K were were swapped. In these cases a little Black Moire in the darker shadows was hardly noticeable, while the annoying pattern caused by the Yellow was avoided.
    Another workaround was using a coarser screen ruling or a "non directional" screen for the Yellow separation for all images.
    Flat tints of colors (vector based) "benefit" noticeably from such manipulations.

  8. #22
    Junior Member xmynhon is on a distinguished road
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    I think the angles in ctp plates are depend on printing proccess in the pressroom and practice yellow color is latest. Please try choose simple agle combination that the printer can easy check.
    I agree more simple is:
    C = 15
    M = 75 (or 45)
    Y = 0 (or 90)
    K= 45 ( or 75 if M = 45)
    (120 - 195 lpi i 2540 dpi)

  9. #23
    Junior Member velikimeda is on a distinguished road
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    C - 15
    M - 75
    Y - 0
    K - 45
    SPOT - 15

    and HPS is ON

  10. #24
    Junior Member yeehaa is on a distinguished road
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    you know yourself bruv

  11. #25
    Junior Member bladerunner is on a distinguished road
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    C15 M75 Y0 K45, switching M/K sometimes helps prevent moire in skins.

  12. Your ad here

  13. #26
    TG3
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    I use
    C15
    M75
    Y90
    K45

  14. #27
    Junior Member Jazz2 is on a distinguished road
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    HTML Code:
    Only the registered members can see the download links/content. please Register to gain full access.

  15. #28
    Junior Member mantoxu is on a distinguished road
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    Quote Originally Posted by xmynhon View Post
    I think the angles in ctp plates are depend on printing proccess in the pressroom and practice yellow color is latest. Please try choose simple agle combination that the printer can easy check.
    I agree more simple is:
    C = 15
    M = 75 (or 45)
    Y = 0 (or 90)
    K= 45 ( or 75 if M = 45)
    (120 - 195 lpi i 2540 dpi)
    I met one problem recently. The artwork back side is gray scale. I guess the angle of K is 75, the customer returned all the order because back side some lines wavy, they should be straight. Then I exchanged the M and K angle(K 45), and everything is nice.
    I do not know why, generally every angle should be fine. It is just one gray scale, no combination color.

    I use 175dpi to make CTP the first time, and 195dpi second time.

  16. #29
    Junior Member mantoxu is on a distinguished road
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    Quote Originally Posted by mantoxu View Post
    I met one problem recently. The artwork back side is gray scale. I guess the angle of K is 75, the customer returned all the order because back side some lines wavy, they should be straight. Then I exchanged the M and K angle(K 45), and everything is nice.
    I do not know why, generally every angle should be fine. It is just one gray scale, no combination color.
    I use 175dpi to output the CTP the fist time, and 195dpi the next time.

  17. #30
    andrisssh
    Guest

    Angles

    -7.5 degrees is also a option for screen angles.

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