There are 12 points to a pica, one pica is approximately 0.166in. Picking - the effect of ink being too tacky and lifting fibres out of the paper. Shows up as small white dots on areas of solid colour. Pipelining - the ability of a program to flow automatically text from the end of one column or page to the beginning of the next. An extra level of sophistication can be created by allowing the flow to be re-directed to any page and not just the next available.
Point size is the measured from the top of the ascender to the bottom of the descender.
Portrait - an upright image or page where the height is greater than the width. Positive - a true photographic image of the original made on paper or film. PostScript - a page description language developed by Adobe Systems. Widely supported by both hardware and software vendors it represents the current 'standard' in the market. John Warnock and Chuck Geschke of Adobe both worked for Xerox at the Palo Alto Research Centre where PDLs were invented and set up their company to commercially exploit the concepts they had helped develop.