Try it out!
node-cocoscii includes a commandline tool
bin/saciimage.js for translating .asciimage files into png. It accepts .asciimage data via stdin, and outputs to its stdout a PNG image representation of the image.
npm install -g node-cocoscii cat ./examples/cross.asciimage | asciimage.js | open -f -a /Applications/Preview.app
You'll see something like as follows:
There are also a number of other implementations of ASCIImage available at ASCIImage.org.