I have used HTP frequently over the years, and always have this setting mapped to one of my Quick Menus on my cameras.
There is nothing really magical or mysterious about it though, and I think it is only "hidden" if you weren't around when it was introduced (I believe in the EOS-1D Mark III, if memory serves).
When HTP is active, the camera underexposes the image by one stop and applies a compensating tone curve to boost the shadows and midtones back to nominal levels. This results in highlights having a more gradual rolloff and retaining more detail in high contrast scenes.
It is particularly useful if you shoot in-camera JPEGs in harsh lighting conditions, or if you want to ensure good detail in a wedding dress, for example.
However, I use it even with RAWs, particularly with certain camera bodies that tend to struggle with blown highlights, like the 5D Mark IV.
While this can introduce slightly more noise in the shadows, this is far less of a problem in cameras with newer HDR sensors than it was in the past. Basically, you can use this without worrying too much with most bodies released in the last 10 years (other than maybe the 6D Mark II and RP).
I can't speak for other third-party conversion tools, but I can say that Adobe Lightroom and ACR both handle this setting transparently, applying the needed tone curves to the files such that they look normally exposed, just like Canon's treatment.
Obviously, a setting like this only makes sense in harsh, contrasty lighting. You would want to disable it in low light, indoors, or on overcast days.
Apr 14, 2026 at 03:00 PM
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