Kodak CIS-221 manual Procedure

CURRENT INFORMATION SUMMARY

September 2001 • CIS-221

Calibrating KODAK PROFESSIONAL

PORTRA Black & White Paper in the

Durst Dice America Epsilon 30 LED

Printer

This procedure will show you how to use the controls within the Epsilon 30 Printer to adjust exposure of each CMY color separately to give a final excellent black-and-white image.

This procedure will show you how to control cyan with the Density filter, magenta with the M filter, and yellow with the

Yfilter.

The initial M, Y, and Density filter settings in the

procedure below were determined for the Epsilon 30 with LED cooling kit, Software Version 2.5 Revision 02 only. Settings for other models may differ slightly.

Use a color print of the Epsilon 30 calibration target for color comparison. Note the location of the cyan, magenta and yellow separation step tablets and locate the D-max step in each tablet (extreme right)—they are not obvious in the monochrome print.

The procedure below requires that an X-Rite densitometer (or equivalent color densitometer) is available to hand read the RGB densities from the C, M, and Y separation D-max steps.

PROCEDURE

1.Start by selecting “Paper,” “List Paper Types,” then “New Paper” in the Durst calibration system

2.Select “New Reflection Paper” and set up “Description,” “Width,” and “Length.” Leave everything else at their default values.

3.“Open” the file and then “Paper,” “Paper Calibration,” and “Show Current Paper Data.”

4.Set the following “Basic Calibration Filter” values to:

D	0.700
Cyan	0.000
Magenta	0.000
Yellow	0.000

Do not adjust the cyan value at any time; this is always zero (0.000).

5. Expose and process the calibration target image. Read just the C, M, and Y separation D-max steps with a handheld X-Rite densitometer. You may need the color reference target mentioned above to locate the C, M, and Y D-max steps. The aim densities are as follows:

Cyan D-max	R 1.50 ±	0.05
Magenta D-max	G 1.22 ±	0.04
Yellow D-max	B 0.58 −	0.03
	(no upper tolerance)

If any of the measured densities are outside the ranges specified, or if any of the next lower steps to the D-max step appear to have hit a plateau for several steps, proceed to step 6; otherwise, go to step 7.

6. If the red density of the cyan D-max step is too dark (greater than 1.55) or too light (less than 1.45), adjust the Density filter (only), and repeat the exposure/ process cycle with each new Density setting until the red density is on aim. (Example, if your first exposure is too dark, you need to add Density in the “current paper calibration” menu to reduce exposure.)

Note: Do not calculate a new LUT (Look Up Table) between iterations.

Proceed to Step 7 when the red density is in range.

7. If the green or blue D-max densities are too high, keep

the Density filter at the same value as in Step 6 and repeat the exposure/process cycle with new M and Y filter settings. Add M filtration if the green D-max is too high; subtract M or Y filtration if the green or blue D-max is too low. Do so until the green and blue densities of the D-max steps are on aim and the adjacent steps can be discerned (no plateau).

Note: Up to now you should not have read the strip using the Epsilon X-rite DTP36, nor should you have ever run an Epsilon “calculate” step. Your last calibration exposure should be on aim for C, M, and Y D-max. The text in the calibration target image should look clean and should have very little fringing. (See the text above step 21 in the neutral tablet; that text is very small but should look clean.)

©Eastman Kodak Company, 2001