Archived posting to the Leica Users Group, 1999/08/13
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Hello Erwin, Could this be a typo? I thought that each pixel was represented by 24 or 48 bits. How can 4 pixels represent 1 pixel? > interpolation. Remember that 4 pixels are needed to record > one image > pixel. On your second article, you say : > As the typical inkjet printer has 6 colors only a limited range of > colors and colorshades can be produced. All other colors and shades > demand the use of a halftone or raster technique. If the printer > would use a 2x2 matrix 5 additional shades can be produced. If we > need the full range of shades a 16x16 matrix will b used. Could you elaborate about the "5 additional shades can be produced"? As far as I remember, on 6 colors printers, there are 4 (black included) basic inks plus 3 see-through ones. So one dot may have 20 "colors/shades" (no ink, ink 1, 2, 3,..6, black, 1+4, 1+5, 1+6, 2+4, ...., 6+6). So a matrix of 4 dots will present 20 power 4 combinations. I do agree that some combinations are equivalent if we consider only the global aspect of the matrix. For example, the square A B A B will have the same color than the squares B A B A or A A B B but it will not give the same effect when the firmware uses anti-aliasing algorithms that is the case, if my memory serves well, with PCL 5 or PhotoEnhance. Moreover, the 750 and 1200 Epson printers are said to be able to control the amount of projected ink. That may lead to a greater number of possibilities, no? All the best. --- Jean-Claude Berger (jcberger@jcberger.com) Systems and RDBMS consultant (MCSE), Lyon, France http://www.jcberger.com