Originally Posted by PerpulaX
I've read somewhere that the resulting image is a normal JPG file that is way too large, so it seems that there is additional data after the end of the actual JPG image. This would also explain why the capability to adjust depth of field is lost once the file is opened and saved by any application. I'll have a look at such a file when I have some spare time; maybe I'll find out more.
I confirm that: I did few shots on a single subject (always using tripod);
- the pictures in normal mode and with wide aperture with the BW camera covered results in 2.5 MB weight (max resolution; the photo's Title/Subject/Description is marked as "edh"
- the same subject in wide aperture mode (with the BW camera fully working) results in 5.5 MB weight (more than double); the photo's Title/Subject/Description is marked as "edf"; if this photo is opened with some image editing software, no alpha layers or other visual information appears anywhere; if the photo is saved back, the size will became comparable to the same photo without wide aperture effect
As depth information are not appearing in any editing software, I suppose they are hidden inside the jpeg file with some kind of steganography technique. I tried to examine the file with some ready-to-use tool (like stegdetect, that should be capable to detect if a jpeg file is standard or has something hidden) but I get only some mismatching header error, nothing that can let me understand where and how the depth information are stored and, primarily, if the black and white picture is also stored inside.