Suppress "blue turns purple problem" in color data

mihas

Active member
R.W.G. HUNT writes that the "blue turns purple problem" is embedded in the trichromatic principle itself (and not only is a cost of the CIE Lab), and its degree depends on the nature of the spectral sensitivity curves of sensors and/or spectral reflection (transmission) curves of dyes.

"When a color is reduced in chroma to fit within a destination gamut, following a line of constant metric hue angle (e.g., CIELAB h), the perceived hue of that color will change if the reference color space is non-linear with respect to hue. This
has ben shown for the CIELAB color space (Hung and Berns (1995), Ebner and Fairchild (1998))". (Gustav J. Braun, Mark D. Fairchild, Fritz Ebner: Color Gamut Mapping in a Hue-Linearized CIELAB Color Space).

Present here suppress "blue turns purple problem" in color data.
 

Attachments

  • berns_hung.png
    berns_hung.png
    43.4 KB · Views: 113
  • spcl_btp.gif
    spcl_btp.gif
    482.9 KB · Views: 106
  • suppress_BTP.png
    suppress_BTP.png
    141.2 KB · Views: 114

Puch

Well-known member
How to use this tool for practical purposes? Can I calculate a superior FOGRA XX profile from the original dataset with iccGPU?
 

mihas

Active member
Can I calculate a superior FOGRA XX profile from the original dataset with iccGPU?
Yes. You can calculate profile from the original FOGRA-ECI dataset. Examples of such profiles based on standard FOGRA colorimetric data are presented here (profiles with iccGPU in the name suffix).
 

What About Profitability?

Canon
What about Profitability?
Offset yields new advantages

Read All About It

   
Top