Understanding Embedded Image

[DS256]

I have a special project where I an extracting the embedded JPG from a FILE image to the format filename_EXT.jpg. I'm trying to understand if selecting "Preview Image" is an industry standard.

I shoot Nikon and Olympus. When I test a couple of images this what I see in available embedded images. To be honest, I didn't know there was more than one:

C:\Users\xxx\Pictures\_temp>exiftool -preview:all .
======== ./20141006_113415.NEF
Jpg From Raw                    : (Binary data 2353332 bytes, use -b option to extract)
Preview Image                   : (Binary data 101280 bytes, use -b option to extract)
Thumbnail TIFF                  : (Binary data 57816 bytes, use -b option to extract)
======== ./20180209_112550.ORF
Thumbnail Image                 : (Binary data 7702 bytes, use -b option to extract)
Preview Image                   : (Binary data 1271246 bytes, use -b option to extract)
    1 directories scanned
    2 image files read

If I set up a batch routine to always select "Preview Image", will one always be available for any RAW file?

[Phil Harvey]

PreviewImage won't necessarily be available.

[DS256]

Thanks for the classification Phil. I should be ok until I change the model of cameras I use.

[StarGeek]

If you check the example.config file, there's a tag there called BigImage which will select the largest preview image in the file.

[DS256]

Thanks Stargeek. I can use that to make a SmallImage.