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- SPrinter
- ========
-
- Porpoise
- ========
-
- The idea is a printer driver which when printed to produces a sprite. This
- is an easy way of getting anything which can be printed into the form of a
- bit map. The process is similar to faxing, and you may notice the parallels
- with e.g. ArcFax. Unlike ArcFax the results can be of any resolution and in
- colour.
-
-
- Installation
- ============
-
- Firstly the Dumper Module 'PDumperSP' should be installed inside !Printers
- in the PDumpers directory. If you have a new machine with !Printers in ROM.
- The correct location will be something like;
-
- ADFS::HardDisc4.$.!Boot.Choices.Printers.PDumpers
-
- If this directory does not exist, you should create it.
-
- Secondly the Printer Definition File (PDF) 'SPrinter' should be installed in
- !Printers in the usual way (drag to the printer control window). Or, little
- known fact, by double clicking.
-
- After that you should click with menu on 'SPrinter' in the Printer control
- window and use the connections entry. Select printing to 'File' and enter a
- path of 'SPrinter:Printout'.
-
- Use 'Configure' on the printer control window menu, and set the sort of
- output you want from the printer driver. This can be colour or grey scale
- and various resolutions. 90dpi is the usual screen resolution. Beware - A4
- size printed at 720dpi will produce massive files.
-
- Finally, the !SPrinter application should be run. Sprites can only
- be saved whilst this is on the icon bar.
-
-
- Use
- ===
-
- Select the 'Sprite' printer driver on the icon bar by clicking with 'Select',
- print in the usual way. When printing has finished, a save box will appear,
- and you can drag this to the desired destination for the sprite.
-
-
- Hints and Tips
- ==============
-
- Sprinter is a printer driver, and although it is producing sprites it has to
- inherit some attributes of a physical printer. So it has a paper size, and
- if you attempt to print beyond this output will be clipped. When you install
- the PDF you can choose a suitably large paper size. A good choice is "A4
- paper size" which will give a printing area of the full size of A4.
-
- By the same token, options on the printer configuration window for half
- toning etc. appear but have no effect.
-
- If you want antialiased output, for example if you want to convert a Draw
- file into a sprite for use on a web page, then the trick is to use SPrinter
- at 180 dpi (for example) and then use a program like ImageMaster to scale
- the results down to 90dpi.
-
- Programs like ImageMaster will allow you to get output in other desirable
- formats like small colour depths, or to save as JPEG's etc.
-
- If you print more than one page at a time, each page will appear
- as an image in the resulting sprite file.
-
- By default the quality options provided by Printers are
-
- Grey, halftoned (fine)
- Colour, halftoned (fine)
- Colour, halftoned
-
- If you set the system variable Printers$DPLJfullQ like this;
-
- Set Printers$DPLJfullQ Full
-
- Perhaps in a boot file or !Printers !Run file, then the options can be extended to;
-
- Mono, small halftone
- Grey, small halftone
- 256 colours, small halftone
- 256 colours, large halftone
- 16 million, small halftone
- 16 million, large halftone
-
- This allows you to produce 256 colour sprites direct, and half toned black
- and white sprites. Unlike the other options, half toning does work for Mono.
-
- This feature only works with Printers 1.52 and 1.53.
-
-
-
- Technical Details
- =================
-
- I have used Acorns Sprite dumper number (i.e. 0) for PDumperSP. Although
- Acorns dumper exists, it has never been finished or released, as far
- as I know.
-
- You can create new graphics modes using PrintEdit on the PDF, typically
- these will have different resolutions.
-
- Note that all sprites produced will have a resolution of 90 dpi. But
- printing at 180 dpi will produce a 90 dpi sprite with twice the number of X
- and Y pixels that printing at 90 dpi will. You can easily tell your image
- processing software the correct resolution of the final bitmap.
-
- If !Printers complains about not being able to find the SPrinter path on
- running, a simple fix is to select another printer as the current one,
- and then click on save choices on !Printers.
- A more complex fix is to set up SPrinter$Path as part of the boot sequence
- or to enter an absolute path when installing the PDF.
-
-
- Credits
- =======
-
- My thanks to John Ferguson for designing the sprites, suggesting the
- name 'SPrinter', and discussions about extended quality options.
-
-
-
-
-
- Release 1.01 17th. November 1998
-
- Fixed problems with free space pointer in sprite files being 4 bytes too small
-
- Release 1.02 5th. February 1999
-
-
-
-
-
- (c) Copyright David Pilling November 1998.
-
-
- --
- email: david@pilling.demon.co.uk
- web: http://www.netlink.co.uk/users/pilling
- web: http://www.pilling.demon.co.uk
- post: David Pilling, P.O. Box 22, Thornton Cleveleys, Blackpool. FY5 1LR. UK.
-