G7 calibration preparation work (3)

The best G7 control strip

In order to best meet the requirements of G7, at least one SC (dark contrast color patch) (75C, 66M, 66Y) color patch and one HC (high light contrast) (25C, 19M, 19Y) color patch should be added. Should be less than the number of HR patches. For example, after placing SID CMYK and HR color patches on each ink key, use the remaining positions to add R, G, B, 50C, 50M, 50Y, SC, and HC patches in sequence.

The best G7 control strip-the arrangement is changed-(requires SC and HC color patches to be less than HR repeated arrangement)

Control strip without G7 gray block

Most signal bars now contain gray-balanced color patches, but the color values ​​are different. such as
The gray balance of the Brunner color bar has a color value of 50C, 41M, and 41Y. If the CIELAB standard value (or CMY standard density value) of these control bars can produce the same gray balance after adjustment, just like the gray balance effect in GRACOL 7. We can obtain the new target value by using the G7 color patch, and then measure the non-G7 gray color patch, and record the actual CIE lab value or density value.

Create RIP Curve

Publish as a normal RIP curve, but clear any values ​​in the calibration table, or use a new blank table. It is best to use uncalibrated printing plates for the first printing, and use uncalibrated values ​​for RIP.

Important Note: Do not use straight line linearity in the publishing machine, so that the measured value of the printing plate dot exactly matches the dot value of the file. But unlike the general case, this will reduce the accuracy of subsequent work.

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