EXIF ExposureBiasValue

[wkitty42]

is the EXIF ExposureBiasValue what is used to determine the Exposure Correction (EXPCORR)??

i've noticed that when EBV is 10, that the CORR is 0... now i have some pictures where i know that i changed the EBV... i'm looking at an EBV of -1310710 and suspect that it should corrospond to a CORR of -3.0 or so... i can't recall if this is one that i manually set of if it is one that the camera possibly chose... this is the first of some 120 pictures i got of the "bluemoon" on the 30th of july... many of the others are taken in various modes and settings and i want to try to learn from this by looking at the numbers and the results...

[wkitty42]

i've gone and done some research on EXIF data... almost i wish i hadn't, now ;)

anyway, after reading thru the specs and not finding anything conclusive, i continued on down thru the stuff that google found for me... one of those was Jake Olefsky's site and his EXIFer (exifixer?) php library... so i grabbed a copy of that real quick and run the photo in question thru it... his library tells me that that EBV is -2 which could very well be consider that picture... but i still have to work it all out to know for sure... the Fstop on that picture is 2.8 and there is a MaxApertureValue of 1966090 which JakeO's library tells me is a MAV of F 2.8...

FWIW: this camera is using the EXIF version 2.1 format... hummm... that almost looks byteswapped from what EE's messages tell me...


msg 32641 | exif: EXIF of 'UPLOAD/P7300009.JPG':

* ImageDescription =>OLYMPUS DIGITAL CAMERA
* Make =>OLYMPUS OPTICAL CO.,LTD
* Model =>C3000Z
* Orientation =>0
* XResolution =>72/1
* YResolution =>72/1
* ResolutionUnit =>0
* Software =>v353u-75
* DateTime =>2004:07:30 20:33:06
* ExposureTime =>10/600
* FNumber =>2.8
* ExposureProgram =>2
* ISOSpeedRatings =>100
* ExifVersion =>0120
* DateTimeOriginal =>2004:07:30 20:33:06
* DateTimeDigitized =>2004:07:30 20:33:06
* CompressedBitsPerPixel =>1/1
* ExposureBiasValue =>-1310710
* MaxApertureValue =>1966090
* MeteringMode =>5
* Flash =>1
* FocalLength =>120/10
* MakerNote data area =>928
* UserComment =>678
* ExifImageWidth =>2048
* ExifImageLength =>1536