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FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
Thread started 22 Nov 2008 (Saturday) 11:32
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40D - Highlight tone priority - any opinion out there

 
David ­ Ransley
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Nov 22, 2008 11:32 |  #1

I am researching whether this is usefull or not see: http://www.bobatkins.c​om …non_eos_40D_rev​iew_6.html (external link)

See the highlight tone priority bit. For one you need to be at ISO 200 or higher.


DRH

  
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Panopeeper
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Nov 22, 2008 13:39 |  #2

The effect of HTP is

1. reducing the effective ISO by one stop (that's the reason it can not be selected @ lower than ISO 200).

This is in effect an underexposure by one stop.

Note, that the displayed ISO number contains "o" the lower case letter) instead of "0", the digit.

2. When creating JPEG in camera: the intensity gets adjusted by +1 EV, but not uniformly: the highlights are kept back.

3. In case of raw: recording this fact as a flag in the raw file.

When processing the raw by Canon software, the intensity gets adjusted by +1 EV, but not uniformly: the highlights are kept back.

When processing with LR/ACR, the intensity gets adjusted by +1 EV, just like an "exposure" adjustment, nothing else. To achieve the same effect as with DPP, one hase to use for example the "recovery" adjustment.

The embedded JPEG is treated than in #2.

That's all to it; nothing magic.


Gabor

  
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David ­ Ransley
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Nov 23, 2008 12:24 |  #3

Panopeeper wrote in post #6739140 (external link)
The effect of HTP is

1. reducing the effective ISO by one stop (that's the reason it can not be selected @ lower than ISO 200).

This is in effect an underexposure by one stop.

Note, that the displayed ISO number contains "o" the lower case letter) instead of "0", the digit.

2. When creating JPEG in camera: the intensity gets adjusted by +1 EV, but not uniformly: the highlights are kept back.

3. In case of raw: recording this fact as a flag in the raw file.

When processing the raw by Canon software, the intensity gets adjusted by +1 EV, but not uniformly: the highlights are kept back.

When processing with LR/ACR, the intensity gets adjusted by +1 EV, just like an "exposure" adjustment, nothing else. To achieve the same effect as with DPP, one hase to use for example the "recovery" adjustment.

The embedded JPEG is treated than in #2.

That's all to it; nothing magic.

Many thanks, did some test shots and I can see the differences. Will look into the technicals you mentioned. This helps.


DRH

  
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40D - Highlight tone priority - any opinion out there
FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
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