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A720 IS and its overexposure-behaviour

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Offline LjL

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Re: A720 IS and its overexposure-behaviour
« Reply #20 on: 04 / July / 2008, 14:28:32 »
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Yes, basically. Given it does contain the JPEG curves feature, I'd definitely suggest you try it out first. It worked fine on my A720, although I didn't use it for very long (since I'm testing DataGhost's build right now).

Re: A720 IS and its overexposure-behaviour
« Reply #21 on: 04 / July / 2008, 14:53:01 »

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Offline LjL

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Re: A720 IS and its overexposure-behaviour
« Reply #22 on: 04 / July / 2008, 15:37:56 »
I think it's the same thing described in the Custom processing for JPEG thread...

Re: A720 IS and its overexposure-behaviour
« Reply #23 on: 04 / July / 2008, 15:59:48 »


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Offline LjL

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Re: A720 IS and its overexposure-behaviour
« Reply #24 on: 04 / July / 2008, 19:17:44 »
I'm new myself (camera has about one week now...) and experimenting. The funny thing is I'm not really so interested in photography, but rather in the tricks you can do with software... :)

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Offline Jucifer

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Re: A720 IS and its overexposure-behaviour
« Reply #25 on: 05 / July / 2008, 06:12:28 »
viewpix: the collaborative CHDK build has everything the trunk ("allbest build") has, and a lot of tweaks & additions.

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Offline LjL

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Re: A720 IS and its overexposure-behaviour
« Reply #26 on: 08 / July / 2008, 18:12:38 »
Anyway, the feature is likely possible to implement.

The zebra code already looks for 100% white pixels; it'd be a matter of telling it to step down if it sees (m)any.

I've tried shooting_set_user_tv96(shooting_get_user_tv96()+32) and shooting_set_tv96_direct(shooting_get_tv96()+32, SET_NOW) (guess-copied from the bracketing code in shooting.c), but got awkward results - most importantly, the viewport's brightness doesn't change in real time.

But it's more than likely that some more clever functions can be employed instead, and/or a viewport update with the requested exposure forced.

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Offline PhyrePhoX

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Re: A720 IS and its overexposure-behaviour
« Reply #27 on: 08 / July / 2008, 18:33:34 »
here is a whole thread about the EV correction: S3IS: Add shortcut for EV adjustments (Allbest build) maybe there is some useful information in there for you. basically manual ev correction is implemented in the jucifer build, you can set ev by a shortcut. the problem that the screen isnt updated persists though, thats why this feature isnt in main trunk yet. on my cam (s3is and possibly s5is as well) the screen updates when you enable the on screen CANON histogram. i think we need to tap into that code somewhere.


Re: A720 IS and its overexposure-behaviour
« Reply #28 on: 19 / July / 2008, 08:06:08 »
« Last Edit: 19 / July / 2008, 08:39:42 by viewpix »

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Offline Hacki

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Re: A720 IS and its overexposure-behaviour
« Reply #29 on: 19 / July / 2008, 08:19:53 »
I honestly see nothing wrong with this pic. Human eyes cover a much bigger dynamic range than a crappy little P&S-sensor. Even though it looks ok to you, there is a huge difference between a roof which is directly illuminated by the sun, or a wall which is in the shadow..


 

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