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  1. mihas

    Delta E'00 l:c:h weighting factors

    To match the dimensions of dE1976 and dE2000, I use factors of 0.67 kL, kC, kh. Statistic of large test charts with 1500 color fields per offset shows such a dimension ratio.
  2. mihas

    New opportunities in offset color separation: iccGPU

    I want to show how two-dimensional gamut mapping based on CIECAM02 works in the profile perceptual table from iccGPU. For comparison, I took a perceptual table of a well-known profile from ECI - ISO Coated v2, for clarity. I tried to show it on photographs, but there is not so clear a comparison...
  3. mihas

    i1pro - i1isi2 and IVORY paper

    I would cautiously advise using relative rather than absolute colorimetry. Tint with blue pigment on the substrate to achieve neutrality will greatly reduce lightness. You may also need to use a white point compensation (WPC) algorithm for the incoming data so as not to lose detail in high...
  4. mihas

    New opportunities in offset color separation: iccGPU

    I am afraid to work with FOGRA 51 and 52 because of the M1 filter and I am waiting for this filter to be deleted from the standard. The programs apply Lab D50 math head-on to the Lab M1 data and balance violations occur because of this, the programs simply do not know that the blue Lab M1 is not...
  5. mihas

    New opportunities in offset color separation: iccGPU

    ISO Coated v2 MaxK MaxWidth iccGPU - profile with Max Width and skeletal black MaxK. Colored paints in the balance are mixed into black to achieve maximum contrast only below a lightness of 25; up to this threshold, a single black ink draws neutral. Thus, all four inks are not found anywhere in...
  6. mihas

    New opportunities in offset color separation: iccGPU

    Thanks for the kind comments! Indeed, iccGPU separations are more like Argyll separations than any others. Apparently Graeme and I came to similar conclusions about the need for an inverted calculation from the inks we need to the color. And special tables Perceptual and Saturation based on...
  7. mihas

    New opportunities in offset color separation: iccGPU

    Spectralcalc iccGPU™ introduces new possibilities for offset color separation. Published for commercial use at: https://cielab.xyz/spectralcalc_en.php The first year of use is usually free. iccGPU uses a graphics accelerator whenever possible for the first time in the history of computer color...
  8. mihas

    Profile Anatomy – why A2Bn & B2An ?

    There is a A2B0, A2B1, A2B2 and B2A0... in the profiles, but not all of these tables are mirrored. Colorimetric tables are mirrored within gamut, perceptual tables are not mirrored. The inverse function is not applicable to profile tables, for the reason that B2A direction tables contain all...
  9. mihas

    i1profiler to create G7 Epson ICC profile

    That's right, density has nothing to do with color at all.
  10. mihas

    Small dot in 0%

    Not all developers recognize v4, and for a small color gamut of printing inks, the difference between v2 and v4 does not matter at all, v4 is not needed. Although a solution is possible and not in the version of profile.
  11. mihas

    SCTV formula in excel

    No, the SCTV formula is not tied in any way to either the Fogra52 or Fogra39. Yes, depending on a different substrate and a different color of inks, the SCTV curves will be different. The picture shows coated paper.
  12. mihas

    SCTV and other Perceptual Uniformity TV online calculator (free)

    In free access online-calculations of Spot Colour Tone Value (SCTV) by ISO 20654:2017 can be done at: Perceptual Uniformity Tone Value calc • SCTV & CIE ΔE Just copy the table with the Lab data by patterned and click "Calc". Input data format: Tone Value, Lab_L, Lab_a, Lab_b (split by tabs or...
  13. mihas

    SCTV formula in excel

    Ideal SCTV Linear Result in TVI coordinates
  14. mihas

    SCTV formula in excel

    SCTV calculations in Excel were published here: SCTV_calc_from_cielab.xyz.xls In this example are CGATS data samples with 4 midtones. Change XYZ samples and tone values to any.
  15. mihas

    Decompiling an ICC profile to see the lookups?

    Spectralcalc decompil the profiles without "targ" signature.
  16. mihas

    Dot gain table...

    If you need tone response curves from any Fogra-ECI profoles - paste icc-profile here https://cielab.xyz/spectralcalc_en.php and click TVI-button: there will be both a graph and a table from profile.
  17. mihas

    Dot gain table...

    Hi! Here https://cielab.xyz/TVI.php any discreteness and standard 2004 or 2013 curves. The space between curves is also described.
  18. mihas

    Software for evaluating spot colors

    Here freeware shareable report, spectral reference and sample is possible, all languages from Google. Report example...
  19. mihas

    Which model is right when considering Color Gamut ?

    Here you can see CIE Lab Gamut (HVS, Human Visual Space) in 2D or 3D, and printing gamut inside HVS: http://rudtp.pp.ru/spectralcalc_en.php Green border - so it looks like a horse shoe (xy locus) in the CIE Lab:
  20. mihas

    color balance in the pressroom

    I chose a lamps to my prepress and to my printing house by CRI and CQS (Color Rendering Index, Ra, Ra14, Ra15; Color Quality Scale (NIST), Qa, Qf, Qp, Qd-GAI). Ideal reference for daylight is all indexes CRI=100% and all indexes CQS=100%. If all indexes CRI>95 and CQS>95 - lamps suitable for...

De-Inking

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