pngsuite -------- (c) Willem van Schaik, 1999, 2011 Permission to use, copy, modify, and distribute these images for any purpose and without fee is hereby granted. The 15 "bas*.png" images are part of the much larger PngSuite test-set of images, available for developers of PNG supporting software. The complete set, available at http:/www.schaik.com/pngsuite/, contains a variety of images to test interlacing, gamma settings, ancillary chunks, etc. The "ft*.png" images are "free/libre" replacements for the transparent corresponding t*.png images in the PngSuite. The images in this directory represent the basic PNG color-types: grayscale (1-16 bit deep), full color (8 or 16 bit), paletted (1-8 bit) and grayscale or color images with alpha channel. You can use them to test the proper functioning of PNG software. filename depth type ------------ ------ -------------- basn0g01.png 1-bit grayscale basn0g02.png 2-bit grayscale basn0g04.png 4-bit grayscale basn0g08.png 8-bit grayscale basn0g16.png 16-bit grayscale basn2c08.png 8-bit truecolor basn2c16.png 16-bit truecolor basn3p01.png 1-bit paletted basn3p02.png 2-bit paletted basn3p04.png 4-bit paletted basn3p08.png 8-bit paletted basn4a08.png 8-bit gray with alpha basn4a16.png 16-bit gray with alpha basn6a08.png 8-bit RGBA basn6a16.png 16-bit RGBA ftbbn0g04.png 4-bit grayscale, black bKGD ftbbn2c16.png 16-bit truecolor, black bKGD ftbbn3p08.png 8-bit paletted, black bKGD ftbgn2c16.png 16-bit truecolor, gray bKGD ftbgn3p08.png 8-bit paletted, gray bKGD ftbrn2c08.png 8-bit truecolor, red bKGD ftbwn0g16.png 16-bit gray, white bKGD ftbwn3p08.png 8-bit paletted, white bKGD ftbyn3p08.png 8-bit paletted, yellow bKGD ftp0n0g08.png 8-bit grayscale, opaque ftp0n2c08.png 8-bit truecolor, opaque ftp0n3p08.png 8-bit paletted, opaque ftp1n3p08.png 8-bit paletted, no bKGD Here is the correct result of typing "pngtest -m bas*.png" in this directory: Testing basn0g01.png: PASS (524 zero samples) Filter 0 was used 32 times Testing basn0g02.png: PASS (448 zero samples) Filter 0 was used 32 times Testing basn0g04.png: PASS (520 zero samples) Filter 0 was used 32 times Testing basn0g08.png: PASS (3 zero samples) Filter 1 was used 9 times Filter 4 was used 23 times Testing basn0g16.png: PASS (1 zero samples) Filter 1 was used 1 times Filter 2 was used 31 times Testing basn2c08.png: PASS (6 zero samples) Filter 1 was used 5 times Filter 4 was used 27 times Testing basn2c16.png: PASS (592 zero samples) Filter 1 was used 1 times Filter 4 was used 31 times Testing basn3p01.png: PASS (512 zero samples) Filter 0 was used 32 times Testing basn3p02.png: PASS (448 zero samples) Filter 0 was used 32 times Testing basn3p04.png: PASS (544 zero samples) Filter 0 was used 32 times Testing basn3p08.png: PASS (4 zero samples) Filter 0 was used 32 times Testing basn4a08.png: PASS (32 zero samples) Filter 1 was used 1 times Filter 4 was used 31 times Testing basn4a16.png: PASS (64 zero samples) Filter 0 was used 1 times Filter 1 was used 2 times Filter 2 was used 1 times Filter 4 was used 28 times Testing basn6a08.png: PASS (160 zero samples) Filter 1 was used 1 times Filter 4 was used 31 times Testing basn6a16.png: PASS (1072 zero samples) Filter 1 was used 4 times Filter 4 was used 28 times libpng passes test Willem van Schaik October 1999