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Samsung APP segments

Started by banana123, December 19, 2024, 01:24:02 PM

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banana123

So I look on some Samsung images from various Galaxy devices, and I encountered in different usage of APP segments.. for example, Galaxy A55 has APP4 & sometimes APP11, Galaxy A15 has APP4, APP5, APP6, APP7 & APP8..
Does any one know what are those segments for?
or why it not even consistent per device?

Phil Harvey

If you can upload some samples I can try to answer this.

- Phil
...where DIR is the name of a directory/folder containing the images.  On Mac/Linux/PowerShell, use single quotes (') instead of double quotes (") around arguments containing a dollar sign ($).

banana123

Quote from: Phil Harvey on December 19, 2024, 01:30:26 PMIf you can upload some samples I can try to answer this.

- Phil

look at this image for example.. straight out of the camera, and includes APP5 & APP6 & APP7 & APP8..
https://jumbomail.me/j/Y3ECzJM6mEm9IuJ

Phil Harvey

I took a quick look.  There is definitely a lot of empty space in these segments.  Lots of zeros and one segment is all ones.  But there is at least a bit of potentially useful metadata (a timestamp in APP6).  There are also lots of tables of 4-byte integers -- I don't know what these are for, but likely a lookup table, perhaps for something like an hdr image maybe.  There is also something that looks more like image data.  Perhaps a depth image?

These are only guesses for now.  Perhaps in time this information will be understood.

- Phil
...where DIR is the name of a directory/folder containing the images.  On Mac/Linux/PowerShell, use single quotes (') instead of double quotes (") around arguments containing a dollar sign ($).

banana123

Quote from: Phil Harvey on January 02, 2025, 09:21:14 PMI took a quick look.  There is definitely a lot of empty space in these segments.  Lots of zeros and one segment is all ones.  But there is at least a bit of potentially useful metadata (a timestamp in APP6).  There are also lots of tables of 4-byte integers -- I don't know what these are for, but likely a lookup table, perhaps for something like an hdr image maybe.  There is also something that looks more like image data.  Perhaps a depth image?

These are only guesses for now.  Perhaps in time this information will be understood.

- Phil

Yehh.. hope so..
I found Samsung mobile devices images are so messy and inconsistencies...