A wife needed to remove the yellow background from scanned PDF song booklets to reprint them larger on 8.5-by-11-inch paper without wasting color printer ink. The author initially suggested removing the background in Photoshop, but the procedure was "too fiddly" and "too annoying and time consuming." He then suggested she use ChatGPT, as she has a "ChatGPT Plus account." Tests using prompts like "Give me back a PDF I can download where the yellow background has been removed and replaced with white" worked, but ChatGPT "subtly altered the resulting PDFs." The wife was concerned that ChatGPT might change "the notes the words or some other aspect of the original music." The article explains that ChatGPT and other AIs are "non-deterministic," meaning "you could feed in the exact same input three or four times, and get three or four different results back," unlike algorithmic programming which is "deeply deterministic."