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JPEG PoCs

  • small.jpg smallest valid JPG (no Application chunk)
  • small-invalid.jpg same file w/o End of Image (invalid structure).
  • 20scans.jpg: a JPEG made of 20 scans with JPEGTran to keep all scans under 64Kb (size = 847kb, 1944x2508px, q=100%) (original PNG for reference).
  • scan definitions:
0: 0-0, 0, 0;
0: 1-1, 0, 0;
0: 2-6, 0, 0;
0: 7-10, 0, 0;
0: 11-13, 0, 0;
0: 14-20, 0, 0;
0: 21-26, 0, 0;
0: 27-32, 0, 0;
0: 33-40, 0, 0;
0: 41-48, 0, 0;
0: 49-54, 0, 0;
0: 55-63, 0, 0;
# blue
1: 0-0, 0, 0;
1: 1-16, 0, 0;
1: 17-32, 0, 0;
1: 33-63, 0, 0;
# red
2: 0-0, 0, 0;
2: 1-16, 0, 0;
2: 17-32, 0, 0;
2: 33-63, 0, 0;

  • lossless.jpg: a JPEG abused to store data losslessly (grayscale, 100%, with data padded and replicated 8 times).

  • lossless.pdf: a PDF making use of that JPEG (non-browser compatible), referencing the image as (losslessly-stored) page content and as image.

  • restart.jpg a 1x16 (2 blocks next to each other) with restart marker (corrupt the ECS before the FF D0 marker to see the result)

  • rgb24x8.jpg Red Gray Blue 8x8 blocks, as 3 independant scans for each component:

    0: 0-63, 0, 0;
1: 0-63, 0, 0;
2: 0-63, 0, 0;

  • rgb.jpg as explained in the original Corkami poster.

  • progressive.jpg a progressive grayscale JPEG where scans are defined as

    0: 0-0, 0, 0;
0: 1-1, 0, 0;
0: 2-2, 0, 0;
0: 3-63, 0, 0;

    to show what progressive loading means. progressive_scan*.jpg shows the result steps of progressive loading

JPEG 2000 PoCs

  • small.jp2 a small valid JP2
  • rgb.jp2 3x1 R, G, B image