system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do they make such complex ASCII art?
gpt
Usually with computer programs. There are many different approaches to generating an ASCII image, depending on how you want your final image to look. For example one simple method would be to transform a picture into a low-resolution grid, where each cell in the grid is assigned a letter depending on the brightness of the picture inside of that cell. It's also possible to mimic certain patterns in each cell, for example a "`L`" can be used to represent a right angle, a `#` can be used for heavy shading and a `+` for light shading, etc.