![[PNG Suite icon]](img_png/pngsuite2.png){kind=small}
PNG Suite from Willem van Schaik
PNG Suite from Willem van Schaik
This is (an older copy of) Willem van Schaik's suite of PNG icons for testing PNG decoder engines, PNG viewers, and PNG browsers. Most of the icons are 32x32, and they run the gamut from 1-bit to 64-bit depth; grayscale, colormapped and truecolor; interlaced or not; and with or without simple transparency, full transparency (alpha channel), background chunks, histograms, gamma or chromaticity data, comments, time stamps, and physical pixel dimensions. There are even three invalid PNG images included, one 0x0 in size and the other two corrupted by non-binary transfers.
Archives containing the full 2011 suite can be found on Willem's own, multi-page PngSuite site, which also includes GIF images for comparison.
Note that all images here are referenced with the standard HTML IMG tag, not OBJECT or Netscape's EMBED; that means this page will not display properly with any PNG plug-in due to bugs (er, that is, limitations) in Netscape's plug-in architecture. (This comment was relevant a decade ago...nowadays, never mind.)version of this page with GIF images for comparison. (Note that the gamma-correction PNG images will necessarily look somewhat different from the corresponding GIF images unless your display characteristics are similar to those of a NeXT.) Willem previously also had an older, separate set of pages (using EMBED) for testing Netscape and/or Internet Explorer PNG plug-ins. -->
The two rows should look identical in browsers that handle transparency correctly. In a normal image viewer (one with no preferred background, i.e., not a web browser), the top four icons should have backgrounds of yellow, white, gray and black, respectively; this will be visible on the left sides of all four images and around the periphery of the first and third icons (the two "X" images). The icons in the bottom row will generally default to a black background in non-browser image viewers.
All six columns will look essentially identical (not counting the printed numbers) if your browser does gamma correction. Within each icon, the two rightmost bars (one solid color and one with alternating black and max-intensity horizontal lines) will appear to be approximately the same color, assuming your browser's gamma correction is correct for your monitor. If your browser just dumps the raw pixel data on screen, the icons to the left will have darker bars than those to the right.
3.1 Basic format test files (non-interlaced)
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basn0g01 - black & white
basn0g02 - 2 bit (4 level) grayscale
basn0g04 - 4 bit (16 level) grayscale
basn0g08 - 8 bit (256 level) grayscale
basn0g16 - 16 bit (64k level) grayscale
basn2c08 - 3x8 bits rgb color
basn2c16 - 3x16 bits rgb color
basn3p01 - 1 bit (2 color) paletted
basn3p02 - 2 bit (4 color) paletted
basn3p04 - 4 bit (16 color) paletted
basn3p08 - 8 bit (256 color) paletted
basn4a08 - 8 bit grayscale + 8 bit alpha-channel
basn4a16 - 16 bit grayscale + 16 bit alpha-channel
basn6a08 - 3x8 bits rgb color + 8 bit alpha-channel
basn6a16 - 3x16 bits rgb color + 16 bit alpha-channel
3.2 Basic format test files (Adam-7 interlaced)
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basi0g01 - black & white
basi0g02 - 2 bit (4 level) grayscale
basi0g04 - 4 bit (16 level) grayscale
basi0g08 - 8 bit (256 level) grayscale
basi0g16 - 16 bit (64k level) grayscale
basi2c08 - 3x8 bits rgb color
basi2c16 - 3x16 bits rgb color
basi3p01 - 1 bit (2 color) paletted
basi3p02 - 2 bit (4 color) paletted
basi3p04 - 4 bit (16 color) paletted
basi3p08 - 8 bit (256 color) paletted
basi4a08 - 8 bit grayscale + 8 bit alpha-channel
basi4a16 - 16 bit grayscale + 16 bit alpha-channel
basi6a08 - 3x8 bits rgb color + 8 bit alpha-channel
basi6a16 - 3x16 bits rgb color + 16 bit alpha-channel
3.3 Size test files
-----------------------
s01n3p01 - 1x1 paletted file, no interlacing
s02n3p01 - 2x2 paletted file, no interlacing
s03n3p01 - 3x3 paletted file, no interlacing
s04n3p01 - 4x4 paletted file, no interlacing
s05n3p02 - 5x5 paletted file, no interlacing
s06n3p02 - 6x6 paletted file, no interlacing
s07n3p02 - 7x7 paletted file, no interlacing
s08n3p02 - 8x8 paletted file, no interlacing
s09n3p02 - 9x9 paletted file, no interlacing
s32n3p04 - 32x32 paletted file, no interlacing
s33n3p04 - 33x33 paletted file, no interlacing
s34n3p04 - 34x34 paletted file, no interlacing
s35n3p04 - 35x35 paletted file, no interlacing
s36n3p04 - 36x36 paletted file, no interlacing
s37n3p04 - 37x37 paletted file, no interlacing
s38n3p04 - 38x38 paletted file, no interlacing
s39n3p04 - 39x39 paletted file, no interlacing
s40n3p04 - 40x40 paletted file, no interlacing
s01i3p01 - 1x1 paletted file, interlaced
s02i3p01 - 2x2 paletted file, interlaced
s03i3p01 - 3x3 paletted file, interlaced
s04i3p01 - 4x4 paletted file, interlaced
s05i3p02 - 5x5 paletted file, interlaced
s06i3p02 - 6x6 paletted file, interlaced
s07i3p02 - 7x7 paletted file, interlaced
s08i3p02 - 8x8 paletted file, interlaced
s09i3p02 - 9x9 paletted file, interlaced
s32i3p04 - 32x32 paletted file, interlaced
s33i3p04 - 33x33 paletted file, interlaced
s34i3p04 - 34x34 paletted file, interlaced
s35i3p04 - 35x35 paletted file, interlaced
s36i3p04 - 36x36 paletted file, interlaced
s37i3p04 - 37x37 paletted file, interlaced
s38i3p04 - 38x38 paletted file, interlaced
s39i3p04 - 39x39 paletted file, interlaced
s40i3p04 - 40x40 paletted file, interlaced
3.4 Alpha-channel (and background) test files
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bgbn4a08 - 8 bit grayscale, alpha, black background chunk
bggn4a16 - 16 bit grayscale, alpha, gray background chunk
bgwn6a08 - 3x8 bits rgb color, alpha, white background chunk
bgyn6a16 - 3x16 bits rgb color, alpha, yellow background chunk
bgai4a08 - 8 bit grayscale, alpha, no background chunk
bgai4a16 - 16 bit grayscale, alpha, no background chunk
bgan6a08 - 3x8 bits rgb color, alpha, no background chunk
bgan6a16 - 3x16 bits rgb color, alpha, no background chunk
3.5 Transparency (and background) test files
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tp0n1g08 - not transparent for reference (logo on gray)
tbbn1g04 - transparent, black background chunk
tbwn1g16 - transparent, white background chunk
tp0n2c08 - not transparent for reference (logo on gray)
tbrn2c08 - transparent, red background chunk
tbgn2c16 - transparent, green background chunk
tbbn2c16 - transparent, blue background chunk
tp0n3p08 - not transparent for reference (logo on gray)
tp1n3p08 - transparent, but no background chunk
tbbn3p08 - transparent, black background chunk
tbgn3p08 - transparent, light-gray background chunk
tbwn3p08 - transparent, white background chunk
tbyn3p08 - transparent, yellow background chunk
3.6 Gamma test files
------------------------
g03n0g16 - grayscale, file-gamma = 0.35
g04n0g16 - grayscale, file-gamma = 0.45
g05n0g16 - grayscale, file-gamma = 0.55
g07n0g16 - grayscale, file-gamma = 0.70
g10n0g16 - grayscale, file-gamma = 1.00
g25n0g16 - grayscale, file-gamma = 2.50
g03n2c08 - color, file-gamma = 0.35
g04n2c08 - color, file-gamma = 0.45
g05n2c08 - color, file-gamma = 0.55
g07n2c08 - color, file-gamma = 0.70
g10n2c08 - color, file-gamma = 1.00
g25n2c08 - color, file-gamma = 2.50
g03n3p04 - paletted, file-gamma = 0.35
g04n3p04 - paletted, file-gamma = 0.45
g05n3p04 - paletted, file-gamma = 0.55
g07n3p04 - paletted, file-gamma = 0.70
g10n3p04 - paletted, file-gamma = 1.00
g25n3p04 - paletted, file-gamma = 2.50
3.7 Filtering test files
----------------------------
f00n0g08 - grayscale, no interlacing, filter-type 0
f01n0g08 - grayscale, no interlacing, filter-type 1
f02n0g08 - grayscale, no interlacing, filter-type 2
f03n0g08 - grayscale, no interlacing, filter-type 3
f04n0g08 - grayscale, no interlacing, filter-type 4
f00n2c08 - color, no interlacing, filter-type 0
f01n2c08 - color, no interlacing, filter-type 1
f02n2c08 - color, no interlacing, filter-type 2
f03n2c08 - color, no interlacing, filter-type 3
f04n2c08 - color, no interlacing, filter-type 4
3.8 Additional palette chunk test files
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pp0n2c16 - six-cube palette-chunk in true-color image
pp0n6a08 - six-cube palette-chunk in true-color+alpha image
ps1n0g08 - six-cube suggested palette (1 byte) in grayscale image
ps1n2c16 - six-cube suggested palette (1 byte) in true-color image
ps2n0g08 - six-cube suggested palette (2 bytes) in grayscale image
ps2n2c16 - six-cube suggested palette (2 bytes) in true-color image
3.9 Ancillary chunks test files
-----------------------------------
cs5n2c08 - color, 5 significant bits
cs8n2c08 - color, 8 significant bits (reference)
cs3n2c16 - color, 13 significant bits
cs3n3p08 - paletted, 3 significant bits
cs5n3p08 - paletted, 5 significant bits
cs8n3p08 - paletted, 8 significant bits (reference)
cdfn2c08 - physical pixel dimensions, 8x32 flat pixels
cdhn2c08 - physical pixel dimensions, 32x8 high pixels
cdsn2c08 - physical pixel dimensions, 8x8 square pixels
cdun2c08 - physical pixel dimensions, 1000 pixels per 1 meter
ccwn2c08 - chroma chunk w:0.3127,0.3290 r:0.64,0.33 g:0.30,0.60 b:0.15,0.06
ccwn3p08 - chroma chunk w:0.3127,0.3290 r:0.64,0.33 g:0.30,0.60 b:0.15,0.06
ch1n3p04 - histogram 15 colors
ch2n3p08 - histogram 256 colors
cm7n0g04 - modification time, 01-jan-1970 00:00:00
cm9n0g04 - modification time, 31-dec-1999 23:59:59
cm0n0g04 - modification time, 01-jan-2000 12:34:56
ct0n0g04 - no textual data
ct1n0g04 - with textual data
ctzn0g04 - with compressed textual data
3.10 Chunk ordering
----------------------
oi1n0g16 - grayscale mother image with 1 idat-chunk
oi2n0g16 - grayscale image with 2 idat-chunks
oi4n0g16 - grayscale image with 4 unequal sized idat-chunks
oi9n0g16 - grayscale image with all idat-chunks length one
oi1n2c16 - color mother image with 1 idat-chunk
oi2n2c16 - color image with 2 idat-chunks
oi4n2c16 - color image with 4 unequal sized idat-chunks
oi9n2c16 - color image with all idat-chunks length one
3.11 Compression level
-------------------------
z00n2c08 - color, no interlacing, compression level 0 (none)
z03n2c08 - color, no interlacing, compression level 3
z06n2c08 - color, no interlacing, compression level 6 (default)
z09n2c08 - color, no interlacing, compression level 9 (maximum)
3.12 Corrupted files
-----------------------
x00n0g01 - empty 0x0 grayscale file
xcrn0g04 - added cr bytes
xlfn0g04 - converted cr bytes to lf and removed all NULs
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*Or, as Vince Sabio
would say, "straight-laced."
HTML copyright © 1996-2011 Greg Roelofs.
PNG Suite images and documentation copyright © 1995-1998 (and 2011 for
the newest set) Willem van Schaik.