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Extend support for raster images #88

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larsbrinkhoff opened this issue Sep 13, 2021 · 2 comments
Open

Extend support for raster images #88

larsbrinkhoff opened this issue Sep 13, 2021 · 2 comments

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@larsbrinkhoff
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larsbrinkhoff commented Sep 13, 2021 •
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The tvpic tool converts from a 576-pixel wide PNG to a raw TV picture. Extend this to also:

  • Convert from raw TV to PNG.
  • Identify files as TV pictures (best effort), for help in locating pictures in archives.
@larsbrinkhoff
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I had the idea that TVEDIT/TVDRAW (PDP-10/its#431) used a format with a header before the picture data, but apparently not. I vaguely recall there was some format like that, but if so that was another program.

@larsbrinkhoff
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larsbrinkhoff commented Nov 11, 2021 •
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TVREAD/TVWRIT/FTV/PW use the "Stanford TV format".

; WORD 0: -1
; WORD 1: BITS PER PIXEL
; WORD 2: WORDS PER LINE
; WORD 3: NUMBER OF FIRST DATA ROW
; WORD 4: ... LAST ROW
; WORD 5: ... FIRST COLUMN
; WORD 6: ... LAST COLUMN
; WORD 7: <-WORD COUNT OF DATA PORTION (NOT HEADER)>,,200
; DATA PORTION STARTS IN WORD 200.

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@larsbrinkhoff