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This is a set of scripts to allow creation of a PNG or GIF image from a viewdata or teletext frame, on-the-fly.
A viewdata frame is typically 23-25 lines of 40 characters. Most save formats are straight sequences of bytes, one per screen position. Depending on the source, there may also be a header or trailer containing binary data.
As well as standard characters, loosely based on the ASCII character set, special control codes affect subsequent characters on the line in particular ways. This includes changing colours, introducing graphics, and other special features.
Needless to say, this format is not therefore intelligible to any standard web browser. The usual approach for displaying the data is therefore to convert it to a modern image format before uploading it to web server. This can be a time consuming process, and results are typically very variable and, to date, invariably lose some detail, such as flashing characters.
These scripts ca
