Roland COLORCHOICE user manual Density Adjustment Hi-Fi JET/CAMM JET, Working with density curves

Density Adjustment (Hi-Fi JET/CAMM JET)

Adjusting the density is an excellent way to control for variables related to your hardware, such as worn ink jets. Adjusting for density is also a good way to insure linearization. For example, if you have a gradient from black to white, you want the transition to be smooth, and not weighted in any particular area. Click Setup>Density Adjustment to display the Density Calibration dialog box.

Import

You can import density files using this button. A standard dialog box lets you locate files.

Export

Use this button to export density files. By default, density files are stored in the Density folder (Roland COLORCHOICE 4/Density/Printer Model) New Use this button to create new density curves. See the section below to learn how to edit a density curve. Once you have the curve that you want, you can save it and it will become available for application to any file.

Delete

Deletes the selected density file.

Edit

Displays the Density Adjustment dialog box, where you can edit the density curve directly.

Working with density curves

1.Click Setup>Density Adjustment.

The Density Calibration dialog box appears.

2.Highlight a density file and then click Edit, or click New to create a new density file. The Density Adjustment dialog box appears.

3.Select a channel to edit from the Channel list.

4.Edit the curve as described below.

Adjusting the Density curve

The density curve translates input dot values read from the file into output dot values that appear on the printed media. The Density Adjustment dialog lets you make precise adjustments to the density curve by adjusting color channels individually, or by simultaneously adjusting all channels. You can save settings you create as .den files. In this way, you can build a library of density files for future use.

The horizontal axis (left to right) and vertical axis (bottom to top) represent density expressed as a percentage of coverage. If you do not adjust the density curve, or if you click the Reset button, the density curve is not a curve at all, but a straight line. This means that no adjustments have been made- a 50% density magenta value read from the file will print at 50% coverage.

To edit each color channel individually

Click on the Channel list to select a color, and then edit the curve by clicking and dragging points on the curve to a new value. To delete a point, drag the point off of the top or bottom of the chart.

To simultaneously edit all channels

You can adjust all channels at the same time by modifying the curve in the same way, and then clicking Apply to All. Keep in mind that any modifications made to all channels will override changes you may have made to the individual channels. Click Reset to return the density curve to its default setting.

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