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The linearization of CTP differs per CMYK colors

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Hello,

Where could be a problem if a linearized CTP (with the one curve for all colors) makes slightly different halftone on the Magenta plate around 70% and 80% ?

Dot shape is round, 175 lpi
Angles:
Cyan 105.000° (Cyan)
Magenta 45.000° (Magenta)
Yellow 90.000° (Yellow)
Black 75.000° (Black)


70% and 80% on C, Y, K plates are as it is expected, except of the Magenta plate, where measurements show +2-3 % more.

See attached screenshots of rendered images and photos of measurements.

Thank you in advance.

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