Re: CALL for DISCUSSION: eXIf 20170115 -- length

did you do this by hand, or did you use some tool?

if you wrote your own software, is it published somewhere?

thanks, Willem


On 2017-01-17 05:43, Max Stepin wrote:
>> Images from my Nikon B700 contain a small thumbnail in the Exif data, and they also contain a larger preview with about 1Mpix -- it happens to be the same image that's shown on the viewfinder and onboard display screen.  I haven't figured out exactly where it resides in the file; ImageMagick does not preserve it when copying the image.
>
> The second smaller JPEG begins after SOI of the first one (sometimes
> with padding in between, sometimes without). Most software would
> (rightfully) ignore it. Here I parsed two of my files:
>
>
> P8260540.JPG
> ------------
> [0x      0] FFD8 [SOI]
> [0x      2] FFE1 [len=19525]  [EXIF] th=[160x120]
> [0x   4C49] FFDB [len=197]    [DQT]
> [0x   4D10] FFC4 [len=418]    [DHT]
> [0x   4EB4] FFC0 [len=17]     [SOF0] (Baseline) [3648x2736] [422]
> [0x   4EC7] FFDA [SOS]
> [0x 1E27E1] FFD9 [EOI]
> [0x 1E27E3] FFD8 [SOI]
> [0x 1E27E5] FFC4 [len=418]    [DHT]
> [0x 1E2989] FFDB [len=132]    [DQT]
> [0x 1E2A0F] FFC0 [len=17]     [SOF0] (Baseline) [640x480] [422]
> [0x 1E2A22] FFDA [SOS]
> [0x 1F4649] FFD9 [EOI]
>
>
> P1000176.JPG
> ------------
> [0x      0] FFD8 [SOI]
> [0x      2] FFE1 [len=33180]  [EXIF] th=[160x120]
> [0x   81A0] FFE2 [len=96]     [MPF]
> [0x   8202] FFDB [len=132]    [DQT]
> [0x   8288] FFC0 [len=17]     [SOF0] (Baseline) [2560x1920] [422]
> [0x   829B] FFC4 [len=418]    [DHT]
> [0x   843F] FFDD [len=4]      [DRI]
> [0x   8445] FFDA [SOS]
> [0x 12DF86] FFD9 [EOI]
> [0x 12E000] FFD8 [SOI]
> [0x 12E002] FFE1 [len=158]    [EXIF]
> [0x 12E0A2] FFDB [len=132]    [DQT]
> [0x 12E128] FFC0 [len=17]     [SOF0] (Baseline) [1440x1080] [422]
> [0x 12E13B] FFC4 [len=418]    [DHT]
> [0x 12E2DF] FFDD [len=4]      [DRI]
> [0x 12E2E5] FFDA [SOS]
> [0x 1969AC] FFD9 [EOI]
>
>
>
>
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-- 
Willem van Schaik
[email protected]

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