In our production, due to many reasons, it will lead to non-standard materials, especially paper. So, how to set the G7 process for different whiteness paper?
When printing on non-standard color paper, GRACoL strongly recommends that when the C value of the three-color combination gray is greater than or equal to 30%, the equipment should be corrected to the specified gray balance of a and b.
2. C ï¼œ 30%
When C is less than 30%, the new chroma standard
a * Three-color combination = a * paper (30-C) / (30 + a * standard value * C / 30)
b * Three-color combination = b paper (30-C) / (30 + b * standard value * C / 30)
C Three-color combination = 25%
a * paper = 2.5
b * paper = -5
Standard a * = 2.5 Ã— (30-25) /30+0Ã—25/30=2.5Ã—0.17=0.425
Standard b * =-5 Ã— (30-25) /30-2Ã—25/30=-5Ã—0.17-2Ã—0.83=-2.51
Take the integer gray balance a * = 0.5 (Â± 0.5), b * =-2.5 (Â± 1.0)
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