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PALcolour is a program which performs high quality colour decoding of PAL composite video images, using a (non-adaptive) 2D "comb filter".

See some history and background to this program at: http://techmind.org/vd/paldec.html

The original version of this software is a Windows executable, built using the long-obsolete Borland C++ Builder v6.0. It's not been "published" even as an exe for many years, and has since had various experimental features added, modified and removed. As an largely unpublished "internal" plaything, various settings and parameters which ought to be parameterised and/or "user" features still require tinkering in the code. I hope to tidy that up in the coming weeks, before uploading the whole project ... but if you're in a hurry and want to fork the code for a different toolchain on a different platform... then go ahead.

I'm also aware of plenty of ways the code could be made more efficient (faster), but in recent years I've been preferring ease of modification and understanding over sheer speed.

For the definitive reference for the PAL standard itself, see ITU Rec. BT 470 aka "Rec.470", here: https://www.itu.int/rec/R-REC-BT.470/en and follow the link to the obsolete 470-6 (1998) version.