Download Practical PostScript. A Guide to Digital Typesetting by David Byram-Wigfield PDF

By David Byram-Wigfield

The subsequent pages clarify the elemental recommendations of Direct
PostScript typesetting. This digital model comprises a few
new fabric and extra references to the Adobe moveable
Document structure. No prior wisdom of computing device
languages is needed by means of the reader.

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Extra resources for Practical PostScript. A Guide to Digital Typesetting

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This instruction parcels the hexadecimal stream of bits into convenient width−sized portions so that the interpreter can digest it a row at a time. The image definition for a larger graphic can now be written and the instruction 8 string, like 24 dict or 68 array, is one that reserves a portion of printer memory for a particular task. The hexadecimals in this instance are enclosed in a figure definition:– gsave /figure {} def 100 100 translate 8 15 scale /data 8 string def8 15 1 [8 0 0 —15 0 15] figure image grestore showpage % FIGURE 2a % NEXT So far we have been using the image command and reading each 1 bit BACK as white and each 0 as a black pixel, producing the black on white figure 2a in the illustration with a white background superimposed on a previously drawn line.

Always type 'nocols' before starting a newpage, as the correct rm width of the line must be restored beforehand. 2 set grestore } def % horizontal rule: specify rule width: eg. 2 pts thick % /1st { gsave 5 IN rm 2 div in sub RM 10 LG 8 rom lm tm moveto VS } def /2nd { grestore gsave lm in 2 mul add rm add 0 translate 10 LG 8 rom vs TM lm tm moveto } def /nocols { LR VS grestore 0 LM 460 TM 300 RM tm vs sub tm exch sub TM lm tm moveto H } def NEXT BACK Practical PostScript FIRST 46 Cappella Archive Font Matrices Normally, to get a PostScript printer to turn up a particular typeface, the following command is issued, with the appropriate point size being used at #: /FontName findfont # scalefont setfont However, every typeface is also made up of a matrix which can be manipulated to create different effects.

The 150 lines by 16 pixels gives 2400 dots per inch, which is the basic imagesetter definition. A 1200 dpi printer will have 8x8 pixels available per cell, giving sixty−four shades of gray; a 600 dpi laser will have 4x4 pixels giving 16 shades; and finally a 300 dpi laser will struggle to have 2x2 pixels per cell, producing only four shades of gray at 150 lines per inch. However, the shades of gray available do increase as the required lines of cells per inch get less. The white numbers in the mid−gray diagram below show how many shades of gray are available to a 300 dpi laser printer as cell pixel numbers reduce or increase when the lines per inch and their angles change.

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