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- Gimp Image Pipe Format
-
- The gih format is use to store a series of brushes, and some extra info
- for how to use them.
-
- Basically, the format is real simple. It is a text header, followed
- by a series of gbr files, all concatenated together.
-
- An image pipe can be thought of as an n-dimensional array of brushes.
- Each dimension is indexed when the pipe is used in painting by some
- parameter, eg an incremental counter, a random value, pointing device
- pen pressure,tilt or velocity , etc.
-
- An idea for how to implement editing of image pipes (with the GIMP) is
- that each layer of the edited image representing the pipe is divided
- conceptually (and visualized by guides) into equal-sized elements,
- each element containing one pixmap brush. The typical cases are only
- one layer, with an array of brushes, or many layers, with just one
- brush per layer. (For instance something produced by some animator.)
-
- The header format
- ================
-
- First line is the name of the pipe.
- Second line is the number of brushes in file, followed by the contents of
- the gimp-image-pipe-parameters parasite (a text string)
-
- ie
- ===========================
- Fire
- 6 ncells:6 step:20 dim:1 cols:3 rows:2 rank0:6 selection:incremental
- ===========================
-
- The rest is just gbr files catted in.
-
- Making a gih file:
-
- 1. Create a series of gbr files. Note these do not
- need to be the same size.
-
- 2. Create a text header like above.
-
- 3. Combine them all together:
-
- cat header brush1.gbr brush2.gbr brush3.gbr > foo.gih
-
-
- Or use the GIH plug-in to save a brush pipe from an image.
-
-
- Thats about it for now.
-