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Så här står det i Bob:s test:
[• Update 09/28/07]
Well, I've now had a chance to look a little more closely at the Highlight Tone Priority mode, and my guess about RAW files (see above) turns out to be wrong. It appears that Highlight Tone Priority affects both the RAW file and the JPEG file. I'm not quite sure what Canon are doing, but it appears to be more than just different processing of the RAW file into a JPEG. It may be some hardware related feature but until Canon tell us, it's hard to say just what's going on. Looking closely at images shot with Highlight Tone Priority turned on and off, there is an increase in the shadow noise if you look closely enough. However in situations which need highlight tone preservation, the increased detail in the highlights far more than makes up for any slight noise increase in the shadows.
[• end of 09/28/07 update]
[• Update 09/28/07]
Well, I've now had a chance to look a little more closely at the Highlight Tone Priority mode, and my guess about RAW files (see above) turns out to be wrong. It appears that Highlight Tone Priority affects both the RAW file and the JPEG file. I'm not quite sure what Canon are doing, but it appears to be more than just different processing of the RAW file into a JPEG. It may be some hardware related feature but until Canon tell us, it's hard to say just what's going on. Looking closely at images shot with Highlight Tone Priority turned on and off, there is an increase in the shadow noise if you look closely enough. However in situations which need highlight tone preservation, the increased detail in the highlights far more than makes up for any slight noise increase in the shadows.
[• end of 09/28/07 update]