CHDK Forum

Using CHDK => Script Writing => Topic started by: oKtosiTe on 31 / March / 2011, 16:27:21

Title: G12: Timelapse/intervalometer with overexposure detection.
Post by: oKtosiTe on 31 / March / 2011, 16:27:21

Title: Re: G12: Timelapse/intervalometer with overexposure detection.
Post by: fudgey on 31 / March / 2011, 17:01:38

Quote from: oKtosiTe on 31 / March / 2011, 16:27:21

Adjust the exposure slowly over the span of several pictures, or

See http://chdk.setepontos.com/index.php?topic=3079.msg31644#msg31644 (http://chdk.setepontos.com/index.php?topic=3079.msg31644#msg31644) (don't let the name confuse you, it's good for generic day time intervalometer use). That script uses the raw buffer shot histogram scripting functionality of CHDK, which is probably the most accurate way of knowing whether your shot was overexposed.

And then there's bv (brightness value of the APEX system as perceived by the camera's autoexposure algorithms) of course, available via get_prop.

Title: Re: G12: Timelapse/intervalometer with overexposure detection.
Post by: oKtosiTe on 01 / April / 2011, 07:00:09

Quote from: fudgey on 31 / March / 2011, 17:01:38

See http://chdk.setepontos.com/index.php?topic=3079.msg31644#msg31644 (http://chdk.setepontos.com/index.php?topic=3079.msg31644#msg31644) (don't let the name confuse you, it's good for generic day time intervalometer use). That script uses the raw buffer shot histogram scripting functionality of CHDK, which is probably the most accurate way of knowing whether your shot was overexposed.

And then there's bv (brightness value of the APEX system as perceived by the camera's autoexposure algorithms) of course, available via get_prop.

Thanks. Lua scripting seems to go a little over my head for now, but I'll see if there's anything in there I can adapt for my purposes.