grfcodec - Man Page

A tool to convert a GRF file into graphics files and meta data, and vice versa.

Synopsis

grfcodec

[-s v] [-d | -e] [options] GRF‐file [Directory]

<GRF‐File> denotes the .GRF file you want to work on, e.g. TRG1.GRF

<Directory> is where the individual sprites should be saved. If omitted, they will default to a subdirectory called sprites/.

-?: Display the help message.
-e: Encode a GRF file. The GRF‐file to pass is the file where to encode to. The source of the GRF‐file, i.e. the .nfo, will be looked for in sprites/GRF‐file.nfo. All graphics files will be searched for relative from the location of the GRF‐file.
-d: Decode a GRF file. The GRF‐file to pass is the file to decode. The result will be in sprites/GRF‐file.nfo and sprites/GRF‐file.png.
-s: Silences the progress output in interactive mode
-v: Display the version.

Options for decoding:

-w num

Write spritesheets files with the given width (default 800, minimum 16)

-h num

Split spritesheets when they reach this height (default no limit, minimum 16)

-b num

Organize sprites in boxes of this size (default 16)

-o ssf

Sets the format of generated spritesheets. See -o ? for a list.

-p pal

Use this palette instead of the default. See -p ? for a list.

Disable decoding of plain text characters as strings.

Disable production of unquoted escape sequences.

Disable production of both quoted and unquoted escape sequences.

This has the side effect of producing a version 6 .nfo, instead of a version 7 .nfo.

List sprite numbers in the image file in hex.

Options for encoding:

-c: Crop extraneous transparent blue from real sprites
-u: Save uncompressed data (probably not a good idea)
-q: Suppress warning messages
-g num: Create a GRF file with the given container version. Valid versions are 1 and 2, where the latter allows bigger sprites, larger sounds, and multiple zoom levels and bit depths for the sprites.
-n: Try both compression algorithms and use the most efficient. This might cause trouble when loading the NewGRF in TTDPatch.

Options for both encoding and decoding:

-m num

Apply colour translation to all sprites except character‐glyphs.

-M num

Apply colour translation to all sprites.

If both of these are specified, only the last is obeyed. -m ? or -M ? for a list of colour translations.