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Storing and PROCESSING Digital IMAGE DATA for COLOR Screen Display and for PRODUCING COLOR SEPARATIONS for PRINTERS

IP.com Disclosure Number: IPCOM000039080D
Original Publication Date: 1987-Apr-01
Included in the Prior Art Database: 2005-Feb-01

Publishing Venue

IBM

Related People

Authors:
Barthel, J Hehl, W [+details]

Abstract

After analog image data y, q, i have been converted into digital image data Y, Q, I, the latter are compressed such that all luminance values Y are stored for adjacent pels, whereas shade value Q and saturation value I are stored only for every nth pel. Missing values may be obtained by reference to preceding values or by interpolation. Negative- to-positive analog values are digitized in an 8-bit byte such that they appear without signs, utilizing the 28 = 256 digital possibilities of representation within a byte. (Image Omitted) The image data for each pel are processed without time-consuming matrix calculations and multiplication, utilizing a table with only 2 parameters Q and I.