github.com/ccccaoqing/test@v0.0.0-20220510085219-3985d23445c0/src/image/png/testdata/pngsuite/README.original (about)

     1  
     2  pngsuite
     3  --------
     4  (c) Willem van Schaik, 1999
     5  
     6  Permission to use, copy, and distribute these images for any purpose and
     7  without fee is hereby granted.
     8  
     9  These 15 images are part of the much larger PngSuite test-set of 
    10  images, available for developers of PNG supporting software. The 
    11  complete set, available at http:/www.schaik.com/pngsuite/, contains 
    12  a variety of images to test interlacing, gamma settings, ancillary
    13  chunks, etc.
    14  
    15  The images in this directory represent the basic PNG color-types:
    16  grayscale (1-16 bit deep), full color (8 or 16 bit), paletted
    17  (1-8 bit) and grayscale or color images with alpha channel. You
    18  can use them to test the proper functioning of PNG software.
    19  
    20      filename      depth type
    21      ------------ ------ --------------
    22      basn0g01.png  1-bit grayscale
    23      basn0g02.png  2-bit grayscale
    24      basn0g04.png  4-bit grayscale
    25      basn0g08.png  8-bit grayscale
    26      basn0g16.png 16-bit grayscale
    27      basn2c08.png  8-bit truecolor
    28      basn2c16.png 16-bit truecolor
    29      basn3p01.png  1-bit paletted
    30      basn3p02.png  2-bit paletted
    31      basn3p04.png  4-bit paletted
    32      basn3p08.png  8-bit paletted
    33      basn4a08.png  8-bit gray with alpha
    34      basn4a16.png 16-bit gray with alpha
    35      basn6a08.png  8-bit RGBA
    36      basn6a16.png 16-bit RGBA
    37  
    38  Here is the correct result of typing "pngtest -m *.png" in
    39  this directory:
    40  
    41  Testing basn0g01.png: PASS (524 zero samples)
    42   Filter 0 was used 32 times
    43  Testing basn0g02.png: PASS (448 zero samples)
    44   Filter 0 was used 32 times
    45  Testing basn0g04.png: PASS (520 zero samples)
    46   Filter 0 was used 32 times
    47  Testing basn0g08.png: PASS (3 zero samples)
    48   Filter 1 was used 9 times
    49   Filter 4 was used 23 times
    50  Testing basn0g16.png: PASS (1 zero samples)
    51   Filter 1 was used 1 times
    52   Filter 2 was used 31 times
    53  Testing basn2c08.png: PASS (6 zero samples)
    54   Filter 1 was used 5 times
    55   Filter 4 was used 27 times
    56  Testing basn2c16.png: PASS (592 zero samples)
    57   Filter 1 was used 1 times
    58   Filter 4 was used 31 times
    59  Testing basn3p01.png: PASS (512 zero samples)
    60   Filter 0 was used 32 times
    61  Testing basn3p02.png: PASS (448 zero samples)
    62   Filter 0 was used 32 times
    63  Testing basn3p04.png: PASS (544 zero samples)
    64   Filter 0 was used 32 times
    65  Testing basn3p08.png: PASS (4 zero samples)
    66   Filter 0 was used 32 times
    67  Testing basn4a08.png: PASS (32 zero samples)
    68   Filter 1 was used 1 times
    69   Filter 4 was used 31 times
    70  Testing basn4a16.png: PASS (64 zero samples)
    71   Filter 0 was used 1 times
    72   Filter 1 was used 2 times
    73   Filter 2 was used 1 times
    74   Filter 4 was used 28 times
    75  Testing basn6a08.png: PASS (160 zero samples)
    76   Filter 1 was used 1 times
    77   Filter 4 was used 31 times
    78  Testing basn6a16.png: PASS (1072 zero samples)
    79   Filter 1 was used 4 times
    80   Filter 4 was used 28 times
    81  libpng passes test
    82  
    83  Willem van Schaik
    84  <willem@schaik.com>
    85  October 1999