Flexible Line Interpretation

Flexible Line Interpretation (FLI) refers to a family of nonstandard graphics modes, and associated file formats, used on the Commodore 64 and other computers that use the VIC graphics chip. Hacks are used to transcend some of the limitations of the standard graphics modes, particularly the restrictions on how many different colors can be displayed in a character-sized cell.

An image to be displayed using FLI may use a standalone image file format, or it may be bundled with a viewer in an executable file. Some such executable files use an .SRF (Self-Running FLI) file extension.

Specific formats
Examples of formats that (presumably) use FLI:
 * AFLI-Editor
 * BFLI
 * FFLI
 * FLI Graph
 * FLI Profi
 * Hires FLI Designer

Software

 * RECOIL
 * http://www.zimmers.net/anonftp/pub/cbm/c64/graphics/viewers/

Sample files

 * http://www.zimmers.net/anonftp/pub/cbm/c64/graphics/pictures/FLI/
 * examples.zip includes some FLI files
 * http://cbmfiles.com/genie/HiResGraphicsListing.php

Links

 * C64 Graphics Modes
 * Codebase 64 wiki: C64 Graphics File Format Specs