griddle

griddle is a program for practicing drawing using the Grid Technique. It takes an input image and uses ImageMagick to automatically draw a grid (of specified dimensions) over it.

Installation

griddle is a shell script; you can copy it to somewhere in your $PATH or just clone the repository and execute it.

Usage

The CLI interface for griddle is griddle <inputfile> <number_of_columns> <number_of_rows> <outputfile>. This is the number of columns and rows, not the number of separators. For example, specifying "2" columns will result in one line splitting the image vertically. Border lines around the edge of the image are always generated.

griddle also generates an image named "blank_grid.png", which is an exact copy of the grid generated on top of the input image, but with a blank white background. This can then be printed out and used to draw on, instead of manually trying to recreate the grid on paper, if you both have a printer and are using a kind of paper that can be used in said printer. (I don't have a printer, but I figured someone might find this feature useful.)

It supports any input and output file formats that ImageMagick supports. The input and output files don't need to be the same format; you can input a PNG and output a JPEG, for example.

Planned Features

• Improve the CLI interface with --options to remove the arbitrary ordering of <number_of_columns> and <number_of_rows>.
• Make border lines optional.
• Allow the user to adjust the color and transparency of grid lines.
• Add a default output filename (something like <inputfilename>_grid.<inputextension>) if no output filename is explicitly given.