singe/thirdparty/SDL2_image/external/libavif/tests/data

Test images

Still images

File circle-trns-after-plte.png

An opaque blue circle on a transparent green background.

It is of color type 2 (PNG_COLOR_TYPE_RGB) and has a tRNS chunk after a PLTE chunk.

File circle-trns-before-plte.png

An opaque blue circle on a transparent green background.

It is of color type 2 (PNG_COLOR_TYPE_RGB) and has a tRNS chunk before a PLTE chunk. Since the PNG specification version 1.2 says "the tRNS chunk [...] must follow the PLTE chunk, if any", libpng considers the tRNS chunk as invalid and ignores it.

File draw_points.png

Source: Generated with ImageMagick's convert command:

  convert -size 3x1 xc:red -alpha on -fill '#00F8' \
          -draw 'point 1,0' \
          -draw 'color 2,0 point' -scale 33x33 draw_points.png

It is of color type 3 (PNG_COLOR_TYPE_PALETTE) and has a tRNS chunk.

Files kodim*

File kodim03_yuv420_8bpc.avif

License: released by the Eastman Kodak Company for unrestricted usage

File kodim03_grayscale_gamma1.6.png

License: released by the Eastman Kodak Company for unrestricted usage

It is kodim03_yuv420_8bpc.avif converted to grayscale and tagged as Gamma 1.6 gAMA PNG chunk.

File kodim03_grayscale_gamma1.6-reference.png

License: released by the Eastman Kodak Company for unrestricted usage

It is kodim03_grayscale_gamma1.6.png converted into sRGB colorspace by Chrome using "Capture Node Screenshot" in DevTools.

File kodim23_yuv420_8bpc.avif

License: released by the Eastman Kodak Company for unrestricted usage

Source: http://r0k.us/graphics/kodak/

Files cosmos*

File cosmos1650_yuv444_10bpc_p3pq.avif

License: Creative Commons Attribution license (reuse allowed)

Source: "Cosmos Laundromat" movie (frame at around 1 minute past the beginning)

Files with high bit depth per channel

File weld_16bit.png

License: "Irrevocable, nonexclusive, worldwide copyright license to download, copy, modify, distribute, perform, and use raw files from Signature Edits for free, including for commercial purposes, without permission from or attributing the photographer or Signature Edits."

Source: Picture from https://www.signatureedits.com/free-raw-photos/, rescaled, modified color balance and converted with GIMP+Darktable to 16b PNG, metadata removed with exiftool -All=.

Metadata

The structure can be displayed using exiv2 -pS <file>.

File dog_exif_extended_xmp_icc.jpg

License: same as libavif

Source: Personal photo.

address	marker	length	data
0	0xffd8 SOI
2	0xffe1 APP1	884	Exif..II*......................
888	0xffe1 APP1	353	http://ns.adobe.com/xap/1.0/.<x:
1243	0xffe1 APP1	32417	http://ns.adobe.com/xmp/extensio
33662	0xffe0 APP0	16	JFIF.........
			...
33818	0xffe2 APP2	612	ICC_PROFILE......T........mntrRG chunk 1/1
			...

File paris_exif_xmp_icc.jpg

License: same as libavif

Source: Personal photo edited with Gimp 2.10.

address	marker	length	data
0	0xffd8 SOI
2	0xffe0 APP0	16	JFIF.....,.,.
20	0xffe1 APP1	1134	Exif..II*......................
1156	0xffe1 APP1	3929	http://ns.adobe.com/xap/1.0/.<?x
5087	0xffe2 APP2	612	ICC_PROFILE......T........mntrRG chunk 1/1
			...

File paris_extended_xmp.jpg

License: same as libavif

Source: Metadata was extracted from paris_exif_xmp_icc.jpg with exiftool -tagsfromfile paris_exif_xmp_icc.jpg paris_exif_xmp_icc.xmp. The text of the first book of De finibus bonorum et malorum was manually inserted in that file under the tag xmp:Label and the second book under the tag xmp:Nickname (any < or > removed to avoid conflicts with XMP). The file was reconstructed with exiftool -tagsfromfile paris_exif_xmp_icc.xmp -Exif= -icc_profile= paris_exif_xmp_icc.jpg -o paris_extended_xmp.jpg. The goal is to have a large XMP blob so that it can only be stored as multiple extended XMP chunks.

address	marker	length	data
0	0xffd8 SOI
2	0xffe0 APP0	16	JFIF.....,.,.
20	0xffe1 APP1	5531	http://ns.adobe.com/xap/1.0/.<?x
5553	0xffe1 APP1	65535	http://ns.adobe.com/xmp/extensio
71090	0xffe1 APP1	65535	http://ns.adobe.com/xmp/extensio
136627	0xffe1 APP1	4791	http://ns.adobe.com/xmp/extensio
			...

File paris_xmp_trailing_null.jpg

License: same as libavif

Source: paris_exif_xmp_icc.jpg loaded with avifReadImage(), stripped of ICC and Exif, a zero byte appended to XMP, then written with avifJPEGWrite() with quality 0 (without calling avifImageFixXMP()).

address	marker	length	data
0	0xffd8 SOI
2	0xffe0 APP0	16	JFIF.........
20	0xffe1 APP1	3930	http://ns.adobe.com/xap/1.0/.<?x
			...

File paris_icc_exif_xmp.png

License: same as libavif

Source: paris_exif_xmp_icc.jpg loaded with avifReadImage() then written with avifPNGWrite() (modified to output metadata this way).

address	marker	length	data
8	IHDR	13
33	iCCP	386	libavif..(.u..+DQ..?3...E.....
431	zTXt	631	Raw profile type exif..H...[..
1074	zTXt	1076	Raw profile type xmp..X..YQ..8
2162	IDAT		...
160456	IEND	0

File paris_icc_exif_xmp_at_end.png

License: same as libavif

Source: paris_exif_xmp_icc.jpg loaded with avifReadImage() then written with avifPNGWrite() (modified to output metadata this way).

address	marker	length	data
8	IHDR	13
33	iCCP	386	libavif..(.u..+DQ..?3...E.....
2162	IDAT		...
151474	eXIf	1126	II*..........................
152612	tEXt	7832	Raw profile type xmp..XMP.0000
160456	IEND	0

File paris_exif_orientation_5.jpg

License: same as libavif

Source: paris_exif_xmp_icc.jpg stripped of all metadata with exiftool -all= and Exif orientation added with exiv2 -k -M "set Exif.Image.Orientation 5"

address	marker	length	data
0	0xffd8 SOI
2	0xffe1 APP1	34	Exif..II*......................
			...

File paris_icc_exif_xmp.avif

License: same as libavif

Source: Encoded from paris_icc_exif_xmp.png using avifenc -s 10 at commit ed52c1b.

File ffffcc-gamma1.6.png

License: Creative Commons Attribution-NonCommercial 2.5 License

Source: Picture from the libpng test page http://www.libpng.org/pub/png/colorcube/colorcube-pngs-gamma16.html.

It's a color image tagged as gamma 1.6.

File ffffcc-gamma1.6.png

License: Creative Commons Attribution-NonCommercial 2.5 License

Source: Picture from the libpng test page http://www.libpng.org/pub/png/colorcube/colorcube-pngs-gamma22.html.

It's a color image tagged as gamma 2.2.

File ffffff-gamma1.6.png

License: Creative Commons Attribution-NonCommercial 2.5 License

Source: Picture from the libpng test page http://www.libpng.org/pub/png/colorcube/colorcube-pngs-gamma16.html.

It's a grayscale image tagged as gamma 1.6.

File ffffff-gamma2.2.png

License: Creative Commons Attribution-NonCommercial 2.5 License

Source: Picture from the libpng test page http://www.libpng.org/pub/png/colorcube/colorcube-pngs-gamma22.html.

It's a grayscale image tagged as gamma 2.2.

File ffffcc-srgb.png

License: Creative Commons Attribution-NonCommercial 2.5 License

Source: Picture from the libpng test page http://www.libpng.org/pub/png/colorcube/colorcube-pngs-sRGB.html.

It's a color image tagged as sRGB.

File ArcTriomphe-cHRM-orig.png

License: Creative Commons Attribution-NonCommercial 2.5 License

Source: Picture from the libpng test page http://www.libpng.org/pub/png/png-colortest.html.

It's a image tagged as gamma 2.2 and BT709 primaries.

File ArcTriomphe-cHRM-red-green-swap.png

License: Creative Commons Attribution-NonCommercial 2.5 License

Source: Picture from the libpng test page http://www.libpng.org/pub/png/png-colortest.html.

It's a image tagged as gamma 2.2 and BT709 primaries but red and green swapped.

File ArcTriomphe-cHRM-red-green-swap-reference.png

License: Creative Commons Attribution-NonCommercial 2.5 License

Source: Picture from the libpng test page http://www.libpng.org/pub/png/png-colortest.html.

It's ArcTriomphe-cHRM-red-green-swap.png converted into sRGB colorspace by Chrome using "Capture Node Screenshot" in DevTools.

Grid

File sofa_grid1x5_420.avif

License: same as libavif

Source: Personal photo converted with avifenc --grid 1x5 --yuv 420 at commit 632d131.

File color_grid_alpha_nogrid.avif

License: same as libavif

Source: https://github.com/AOMediaCodec/libavif/issues/1203

The color planes are arranged as a 1x2 grid item. The alpha plane items are tagged as dimg for each color plane item (without a grid item on its own). This is allowed per the specification. libavif should decode such files correctly (i.e.) it should report them as files with alpha channel.

Box structure of the items in this file:

[primary item grid]
   ^       ^
   |dimg   |dimg
   |       |
[color] [color]
   ^       ^
   |auxl   |auxl
   |       |
[alpha] [alpha]

Other Test Files

File sRGB2014.icc

License: Copyright International Color Consortium, 2015

Source: https://www.color.org/srgbprofiles.xalter#v2