quadtone:
QSIF:
Short for Quartersize Image Format; an image format in which the image is reduced to 176 by 112 pixels.
Quadtone digital and Platinum prints, with excellent technical info and links to helpful resources.
Ken Rockwell - La Jolla, California, USA based site showcases California and the world.
For black-and-white output, many photographers consider monochrome inksets, often referred to as quadtone inksets, even though many use a combination of more than four neutral or near neutral inks.
If you master duotones, Photoshop also supports Tritones (three colors) and Quadtones (four colors). Simply select how many colors you want to work with from the Duotone Options drop-down list.
Photoshop's own Duotone dialog ...
If you're going to print digitally, don't try to copy the look of a fiber base print. Do something else, like a piezographic quadtone.
And since I've been toying with getting a second Epson printer strictly for Quadtone work, this may become my main emulsion for this purpose (with all the caveats about dye versus silver in terms of longevity, of course).
 See also: Color, Time, Gray, Image, Digital
  
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