# (v13) Bump-up curve arrays

*This page applies to Harlequin v13.1r0 and later; and to Harlequin Core but not Harlequin MultiRIP.*

The array contains a number of (X,Y) pairs each representing a point on the `/BumpUpCurve`

. The following conditions must be met (which are slightly different to those for a normal calibration curve represented by the `/Curve`

entry in a colorant subdictionary):

- the array must contain at least 2 number pairs
- the X values must exactly cover the range
`0.0`

to`1.0`

(that is, the first number in the array must be`0.0`

and the second last must be`1.0`

). - both X and Y values must be at least weakly monotonic (that is, a duplicate X or Y value is allowed to represent a vertical or horizontal curve section), but an X value may not be lower than an X value earlier in the array and a Y value may not be lower than a Y value earlier in the array.
- The RIP connects the points using straight lines. The purpose of this parameter is to allow adjustment of the highlight values in flexographic printing. One
`/BumpUpCurve`

is used for all color channels.

For more information see the *Extensions Manual*.