TWiki to JPEG Converter

TWiki wrote the book on enterprise wikis in the 2000s — the ---+ heading syntax, %VARIABLES% macros and TML tables spread through corporate intranets and spawned the Foswiki fork. A generation of internal documentation lives in this markup, often on servers nobody dares upgrade.

Migrating those intranets is where TWiki conversion earns its keep: Pandoc reads TML headings, lists, tables and wiki links, and re-emits them as Markdown for Confluence-era platforms or as Word/HTML for frozen archives.

JPG (short for JPEG, the Joint Photographic Experts Group committee that standardized it in 1992) has been the default photo format for over three decades. It compresses photographs using the discrete cosine transform: the image is split into 8×8 blocks, and details the human eye is bad at noticing are discarded. The result is files many times smaller than uncompressed data, at a quality level you control when saving.

In practice JPG is unbeatable for photographs and smooth gradients — camera memory cards, messaging apps and the web all assume it. It is a poor fit for screenshots, logos or anything with sharp edges and flat color, where compression leaves visible ringing around text. There is no transparency support, color depth is capped at 8 bits per channel, and every re-save with compression compounds tiny generational losses.