Benchmark results on 1797 different images

1797 images, 1250 megapixels, run on one amd64 machine with every codec single-threaded and one pass per image. libpng writes at its default compression level with adaptive filtering; stb_image_write and stb_image are used at their defaults. All three see the same four channels, and every BNG file was decoded back and compared to the source pixels.

Total

	decode ms	encode ms	decode MP/s	encode MP/s	size KiB	bpp
libpng	9.6	135.4	72.2	5.1	620	7.30
stb_image	8.9	77.2	78.2	9.0	885	10.43
bng	7.3	8.1	94.7	86.1	538	6.33

1797 images, 1250.2 megapixels.

screenshot_game

	decode ms	encode ms	decode MP/s	encode MP/s	size KiB	bpp
libpng	8.8	114.2	76.0	5.9	483	5.92
stb_image	7.6	68.7	87.5	9.7	685	8.40
bng	6.8	7.9	97.9	84.5	462	5.66

568 images, 379.6 megapixels.

pngimg

	decode ms	encode ms	decode MP/s	encode MP/s	size KiB	bpp
libpng	24.7	266.7	75.8	7.0	1271	5.56
stb_image	21.3	182.4	88.1	10.3	1857	8.12
bng	17.5	19.0	106.9	98.5	1090	4.77

171 images, 320.5 megapixels.

photo_tecnick

	decode ms	encode ms	decode MP/s	encode MP/s	size KiB	bpp
libpng	26.8	573.7	53.8	2.5	2414	13.74
stb_image	30.1	256.0	47.8	5.6	3529	20.08
bng	20.4	22.6	70.7	63.7	1931	10.98

100 images, 144.0 megapixels.

screenshot_web

	decode ms	encode ms	decode MP/s	encode MP/s	size KiB	bpp
libpng	85.8	457.5	94.8	17.8	2403	2.42
stb_image	57.4	530.3	141.6	15.3	3080	3.11
bng	58.8	63.9	138.1	127.2	1976	1.99

14 images, 113.8 megapixels.

textures_pk02

	decode ms	encode ms	decode MP/s	encode MP/s	size KiB	bpp
libpng	4.4	92.6	69.3	3.3	428	11.54
stb_image	4.7	40.6	64.8	7.5	625	16.84
bng	4.0	4.2	76.4	73.0	410	11.07

235 images, 71.4 megapixels.

textures_plants

	decode ms	encode ms	decode MP/s	encode MP/s	size KiB	bpp
libpng	13.3	160.3	79.4	6.6	862	6.68
stb_image	11.0	101.7	96.4	10.4	1197	9.28
bng	10.2	11.2	103.9	94.4	710	5.51

59 images, 62.3 megapixels.

icon_512

	decode ms	encode ms	decode MP/s	encode MP/s	size KiB	bpp
libpng	2.7	15.0	96.2	17.5	51	1.60
stb_image	1.9	14.8	136.4	17.8	69	2.17
bng	2.3	2.2	116.2	120.0	61	1.91

213 images, 55.8 megapixels.

photo_wikipedia

	decode ms	encode ms	decode MP/s	encode MP/s	size KiB	bpp
libpng	20.6	426.5	52.6	2.5	2046	15.46
stb_image	23.8	197.4	45.6	5.5	2895	21.87
bng	16.4	17.1	66.3	63.5	1672	12.63

49 images, 53.1 megapixels.

textures_photo

	decode ms	encode ms	decode MP/s	encode MP/s	size KiB	bpp
libpng	17.3	304.6	60.8	3.4	1978	15.45
stb_image	18.1	149.1	58.1	7.0	2554	19.95
bng	13.6	14.1	77.2	74.5	1283	10.02

20 images, 21.0 megapixels.

textures_pk01

	decode ms	encode ms	decode MP/s	encode MP/s	size KiB	bpp
libpng	1.8	29.5	71.0	4.4	164	10.32
stb_image	1.8	15.5	71.5	8.4	232	14.66
bng	1.5	1.6	85.2	81.8	144	9.10

113 images, 14.7 megapixels.

photo_kodak

	decode ms	encode ms	decode MP/s	encode MP/s	size KiB	bpp
libpng	7.7	138.3	50.9	2.8	718	14.95
stb_image	8.4	67.3	46.6	5.8	981	20.45
bng	5.8	6.4	68.2	61.4	551	11.48

24 images, 9.4 megapixels.

textures_pk

	decode ms	encode ms	decode MP/s	encode MP/s	size KiB	bpp
libpng	3.5	51.2	58.7	4.0	490	19.70
stb_image	4.4	36.4	46.2	5.6	693	27.84
bng	3.4	2.9	60.8	70.9	435	17.48

18 images, 3.7 megapixels.

icon_64

	decode ms	encode ms	decode MP/s	encode MP/s	size KiB	bpp
libpng	0.1	0.4	57.0	9.7	4	7.56
stb_image	0.1	0.4	73.8	10.4	4	8.90
bng	0.1	0.1	76.1	66.7	4	7.18

213 images, 0.9 megapixels.

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