https://bugzilla.wikimedia.org/show_bug.cgi?id=41374

--- Comment #2 from Andre Klapper <aklap...@wikimedia.org> 2012-10-25 23:55:30 
UTC ---
libpng version info welcome.

Pardon my stupid question, but where does the user interface on
https://commons.wikimedia.org/wiki/File:1khz_dither.png provide a 180px
version?

Clicking on "Download" and under "Download image file:", clicking on any of the
options "16px | 32px | 64px | 128px | 256px | Full resolution" always provides
the same size and file URL in Firefox 16.0.1.

Using https://upload.wikimedia.org/wikipedia/commons/e/e0/1khz_dither.png
itself (probably not very useful), I get:

$:andre\> pngcheck -vv 1khz_dither.png 
File: 1khz_dither.png (8834 bytes)
  chunk IHDR at offset 0x0000c, length 13
    502 x 429 image, 24-bit RGB, interlaced
  chunk pHYs at offset 0x00025, length 9: 3779x3779 pixels/meter (96 dpi)
  chunk IDAT at offset 0x0003a, length 7696
    zlib: deflated, 32K window, default compression
    rows per pass: 54, 54, 54, 108, 107, 215, 214
    row filters (0 none, 1 sub, 2 up, 3 avg, 4 paeth):
      4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4
      4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4
      4 4 4 4 | 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4
      4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4
      4 4 4 4 4 4 4 4 4 | 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4
      4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4
      4 4 4 4 4 4 4 4 4 4 4 4 4 4 | 4 4 4 4 4 4 4 4 4 4
      4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4
      4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4
      4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4
      4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 | 4
      4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4
      4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4
      4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4
      4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4
      4 4 4 4 4 4 | 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4
      4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4
      4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4
      4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4
      4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4
      4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4
      4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4
      4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4
      4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 | 4 4
      4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4
      4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4
      4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4
      4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4
      4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4
      4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4
      4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4
      4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4
      4 4 4 4 4 4 4 4 4 4 4 4 (806 out of 806)
  chunk IDAT at offset 0x01e56, length 1048
    row filters (0 none, 1 sub, 2 up, 3 avg, 4 paeth):
     physical_value = p0 + p1 * original_sample / (x1-x0) (806 out of 806)
  chunk IEND at offset 0x0227a, length 0
No errors detected in 1khz_dither.png (5 chunks, 98.6% compression).

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