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10STRUCTURE OF PNG FILE: 1343_empty.png
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20STRUCTURE OF PNG FILE: 1343_comment.png
21 address | chunk |  length | data                           | checksum
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23      33 | sRGB  |       1 |                                | 0xaece1ce9
24      46 | gAMA  |       4 | ....                           | 0x0bfc6105
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26      83 | IDAT  |     257 | x^..1..0......t.....h......z.. | 0x64465429
27     352 | tEXt  |      24 | Comment.Can you read me?       | 0x83cad5fa
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30STRUCTURE OF PNG FILE: 1343_comment.png
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38     403 | tEXt  |      24 | Comment.Can you read me?       | 0x83cad5fa
39     439 | IEND  |       0 |                                | 0xae426082
40changed comment
41STRUCTURE OF PNG FILE: 1343_exif.png
42 address | chunk |  length | data                           | checksum
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44      33 | sRGB  |       1 |                                | 0xaece1ce9
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51Exif.Image.ImageDescription                  Ascii      17  Can you read me?
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55Exif.Image.YCbCrPositioning                  Short       1  Centered
56STRUCTURE OF PNG FILE: 1343_exif.png
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60      84 | zTXt  |     145 | Raw profile type exif..x.U.... | 0x2f6d89e8
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64     291 | IDAT  |     257 | x^..1..0......t.....h......z.. | 0x64465429
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66changed comment
67Exif.Image.ImageDescription                  Ascii      17  Can you read me?
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69Exif.Image.YResolution                       Rational    1  72
70Exif.Image.ResolutionUnit                    Short       1  inch
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72