image_generator

This project is a small Node.js CLI script that generates patterned PNG images.

It uses:

• commander to read CLI options
• jimp to create and write image files

What it does

index.js creates an image pattern and writes the result to:

output/<shape>_1px_<width>x<height>.png

When a mask is applied, the output file is named:

output/<shape>_1px_<width>x<height>_<mask>_<mask-color>.png

Usage

Run the script with width and height values (and optional shape/mask options):

node index.js -w 256 -h 256 -s checkers

Both -w (width) and -h (height) are required and must be positive integers. The script will exit with a non-zero status and print an error message if they are missing or invalid.

Available shapes:

• checkers (default)
• stripes
• diamonds
• circle

If an unrecognized shape is provided, the script will print a warning and default to checkers.

Example output file:

output/checkers_1px_256x256.png

Masks

A mask can be applied over the generated image using --mask. Pixels outside the mask area are replaced with the configured mask color.

node index.js -w 256 -h 256 -s checkers --mask circle --mask-color black

Available masks:

• circle — circular mask centered in the image, sized to fit the shortest dimension
• diamond — diamond mask centered in the image, sized to fit the shortest dimension

Available mask colors (area outside the mask):

• black (default)
• white
• transparent

Example output file:

output/checkers_1px_256x256_circle_black.png