PDA

View Full Version : RAW file reference manual?


Tordan58
14th January 2013, 09:03 PM
Hi,

Does anyone have a pointer to a document with a reference section to how EXIF tags and values are stored in a RAW file?

The topic is posted for E5, but is likely valid for most E- cameras.

/Tord

Jim Ford
14th January 2013, 11:31 PM
If nobody comes up with an answer in the meanwhile, I'll look at a raw file with OD (octal dump) on a linux machine, and search for the string 'E5'.

Jim

Tordan58
15th January 2013, 09:30 AM
Thanks Jim,

I did have a look at ORF files using a binary file editor.

The issue is that tags identifiers have binary type and most have binary (non-ASCII) values and unless the values are readable to human it is hard to read/decode the file contents and find out where to look for the tags.

So my question is if there exists a reference documentation describing how ORF files are structured with respect to tags and how to interpret tag values. Such a documentation exists, the question is if there exists copies public available. (Does not need to be supported by Olympus, I am not planning any commercial application).

/Tord

DerekW
15th January 2013, 10:00 AM
The EXIF data in a RAW file is actually held in the JPEG image that is included in the RAW file.

I did a Google of the phrase "exif tags in RAW file" and apart from the Wiki response this response seemed to give quite useful info

http://www.talkgraphics.com/showthread.php?46294-EXIF-and-RAW-images

On the Mac in Finder I did a Get Info on a RAW file and was able to see the Exif data as well as the JPEG.

birdboy
16th January 2013, 05:44 PM
Hi Tord
Did you find any links? The best guide seems to be ExifTool by Phil Harvey.
http://www.sno.phy.queensu.ca/~phil/exiftool/
Click on the Olympus/Epson links for oly specific tags.

You have to be pretty keen to want to extract this level of detail from files, good luck.

John