ImagerDoc.Tioga
Michael Plass, July 19, 1983 1:22 pm
Someday this document will contain glorious documentation for the Imager. For now, it serves as a repository for the special little bits of information that are needed to fully utilize the capabilities of the Imager, but cannot be figured out by looking at the interface.
Device types
These are the atoms to use when creating contexts to specify the device:
$LFDisplay The default one-bit-per-pixel black-and-white display.
$ColorDisplay The default color display, in whatever mode it is in right now.
$PDHornet For a PD file for a 384 dots-per-inch, vertically scanned printer.
$PDPuffin For a PD file for a 384 dots-per-inch, horizontally scanned 3-color printer.
Special colors
These atoms may be used as colors to obtain special effects:
$XOR Masks invert pixels on the display. Can be undone by masking again.
REF CARDINAL On bitmap displays, uses the 16 bits of the cardinal as a 4 by 4 stipple pattern;
 other devices convert this into an intensity of (number of zero bits)/16.