DLI Implementation and Reference Guide - Datalogics

Image Display 11.13
from the image's dictionary. (This can be accomplished through the cosImage
member of the DLPDFIMAGE structure.) If the imagemask is to be placed over an
image, it need not be the same size or resolution as any of the images it masks; in fact,
the use of an imagemask of significantly higher resolution than the image to be
masked is a useful way to simulate gradations of transparency.
Transparent Graphics via Imagemasks Sample
In an accompanying /codesamples folder you should find a sample file entitled
creating transparent graphics using imagemasks.txt. This
demonstrates how to create a mask from a suitable graphic which is approximately 11
times as wide and high as the image to be masked.
NOTE: The files in the /Codesamples folder are not intended to be buildable
source as-is, only to be demonstrations of correct command syntax for different
purposes.
dlpdfcontentgstate
This method enables a user to set a graphics state in a PDF file, for graphics
operations which normally have no such state associated with them.
For example, when creating an imagemask to create a green mask, an appropriate
color and colorspace must be specified. Thus dlpdfcontentgstate is called to set
the graphics state of the specified DLPDFCONTENT to that of the PDEGraphicState.
This may be done at any point during content placement operations.