Generally, this isn’t a huge difference for _high key_, since they’re both kinda bright, but there is generally a different emotional effect:
* High-key image: ethereal, delicate, dream-like
* High-key lighting: cheery, upbeat, energetic
but if we go to _low key_, there’s a huge difference: low key *lighting* usually means that there’s a lot of contrast from a hard non-key light. This is often dramatic and dynamic, whereas a low key image in the classical sense has an overall sense of darkness, often without contrasting highlights:
* Low-key image: somber, restrained, depressing
* Low-key lighting: dramatic, mysterious, taut
In some ways this is a tangent to the tutorial, but it’s something I see a lot of people get mixed up, and it’s confusing when people are using a similar-sounding term to mean very different things.

Started out doing photography at the age of 6 using an uncle's old 1940 kodak brownie box camera. At 15 years of age, I decided to buy my very own 1975 Praktica SLR camera. I now shoot with a Nikon D850. I do unpaid TFP and commercial paid work.