HARFA: SCREENSHOTS AND TUTORIALS: GREY SCALE   Separations Grey Scale Pictures are usually stored using the additive RGB colour model. By processing of a picture with 24 bits of information for each pixel (bits per pixel), it is possible to mask more than 16,7 millions colour shades. However, to interpret the results much smaller number is frequently sufficient. This can be accomplished for example by transformation of the colour images into the grey scale. In view of the sensitivity of the human eye (the most sensitive to green), the conversion is usually carried out uses the equation I = 0,299 R + 0,587 G + 0,114 B. The colour-depth is now reduced from 24 to 8 bits (each of the three colour channels contains the same colour shade). The number of masked colours is now 256 (2^8). Previous Next