Key |
Type |
Value |
---|---|---|
Type |
name |
(Optional) The type of PDF object that this dictionary describes; if present, shall be Halftone for a halftone dictionary. |
HalftoneType |
integer |
(Required) A code identifying the halftone type that this dictionary describes; shall be 16 for this type of halftone. |
HalftoneName |
byte string |
(Optional) The name of the halftone dictionary. |
Width |
integer |
(Required) The width of the first (or only) rectangle in the threshold array, in device pixels. |
Height |
integer |
(Required) The height of the first (or only) rectangle in the threshold array, in device pixels. |
Width2 |
integer |
(Optional) The width of the optional second rectangle in the threshold array, in device pixels. If this entry is present, the Height2 entry shall be present as well. If this entry is absent, the Height2 entry shall also be absent, and the threshold array has only one rectangle. |
Height2 |
integer |
(Optional) The height of the optional second rectangle in the threshold array, in device pixels. |
TransferFunction |
function or name |
(Optional) A transfer function, which shall override the current transfer function in the graphics state for the same component. This entry shall be present if the dictionary is a component of a type 5 halftone (see 10.5.5.6, "Type 5 Halftones" ) and represents either a nonprimary or nonstandard primary colour component (see 10.4, "Transfer Functions" ). The name Identity may be used to specify the identity function. |