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FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
Thread started 24 Sep 2008 (Wednesday) 04:05
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auto lighting optimiser - what does it do?

 
mrklaw
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Sep 24, 2008 04:05 |  #1

and highlight tone priority for that matter.

got my 50D and have no idea what these do. The manual is next to useless on this.


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TheShotLessTaken
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Sep 24, 2008 04:05 |  #2

Where do you live?


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apersson850
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Sep 24, 2008 04:37 as a reply to  @ TheShotLessTaken's post |  #3

Highlight tone priority exposes the highlights a little less, to avoid blowing them into the overflow range. The cost for this is slightly more noise in the shadows.
It has a noticeable effect.

Auto lighting optimizer is a more general thing, intended to correct exposure deficits all over the image, thus not only saving highlights but also lifting shadows, to preserve more detail in them. Like expanding the dynamic range of the sensor without really doing that, but just aqueezing in the available light into what the sensor can capture. I don't have any camera where this can be turned on or off as you like, since on the 40D, it's always on in pre-programmed modes and always off in the creative zone. But most tests I've read, where they tested a camera which does allow you to turn it on or off as you like, have found it to have no effect whatsoever.


Anders

  
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mrklaw
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Sep 26, 2008 03:21 as a reply to  @ apersson850's post |  #4

thanks. So is it kind of like using shadows/highlights in Photoshop elements? I'm not sure I'd be happy for my camera to decide what needs lightening or not.


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chauncey
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Sep 26, 2008 04:52 as a reply to  @ mrklaw's post |  #5

Don't know your body, but with my Ds3, using that feature decreases buffer size.


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leadweight
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Sep 26, 2008 07:33 |  #6

On my XSi ALO is on by default, but may be turned off in custom settings. I have not tried that yet. I have tried HTP both on and off and could not tell the diference. HTP does eliminate the ISP 100 setting. HTP also had a strange side effect of preventing the toning options in DPP from working on monochrome images.




  
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apersson850
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Sep 26, 2008 13:18 as a reply to  @ leadweight's post |  #7

I can easily tell the difference if I use highlight tone priority on the 40D. But as always/most of the time, it's mainly a good feature if you use jpeg.

The newer cameras have three different settings for auto light optimizing, standard, more or less, apart from turning it off all together. Perhaps that's more useful?

I guess you could try green box vs. P mode, with P mode set up to be equivalent to the green box, to see what difference it may do on a 40D.


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auto lighting optimiser - what does it do?
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