Re: libpng warning: eXIf: duplicate - what does it mean?

On Fri, 11 Dec 2020 at 15:03, Ben Bullock <[email protected]>
wrote:

>
> What could be causing this error?
>

Examining the output png file with hexdump, it actually appears to have two
eXIf chunks:

00000000  89 50 4e 47 0d 0a 1a 0a  00 00 00 0d 49 48 44 52
 |.PNG........IHDR|
00000010  00 00 00 64 00 00 00 64  08 02 00 00 00 ff 80 02
 |...d...d........|
00000020  03 00 00 00 11 65 58 49  66 4d 4d 20 72 61 6e 64  |.....eXIfMM
rand|
00000030  6f 6d 20 67 61 72 62 61  67 65 31 57 20 29 00 00  |om garbage1W
)..|
00000040  02 1f 49 44 41 54 78 9c  ed 9a d1 8a c2 40 10 04  |..IDATx......@
..|
....
00000250  07 02 39 78 20 90 83 07  02 39 78 20 90 83 07 82  |..9x ....9x
....|
00000260  5f 45 33 e3 f1 a2 49 87  0a 00 00 00 11 65 58 49
 |_E3...I......eXI|
00000270  66 4d 4d 20 72 61 6e 64  6f 6d 20 67 61 72 62 61  |fMM random
garba|
00000280  67 65 31 57 20 29 00 00  00 00 49 45 4e 44 ae 42  |ge1W
)....IEND.B|
00000290  60 82                                             |`.|
00000292

So while the duplicate error seems to be valid, I'm not sure how it got two
chunks.

What error might I have made which caused this to happen?

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