| # Test images | |
| ## Still images | |
| ### File [circle-trns-after-plte.png](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](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](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. | |
| ### File [white_1x1.avif](white_1x1.avif) | |
|  | |
| License: [same as libavif](https://github.com/AOMediaCodec/libavif/blob/main/LICENSE) | |
| Source: single white pixel encoded with libavif at default quality. | |
| ### Files `kodim*` | |
| #### File [kodim03_yuv420_8bpc.avif](io/kodim03_yuv420_8bpc.avif) | |
|  | |
| License: released by the Eastman Kodak Company for unrestricted usage | |
| #### File [kodim03_grayscale_gamma1.6.png](kodim03_grayscale_gamma1.6.png) | |
|  | |
| License: released by the Eastman Kodak Company for unrestricted usage | |
| It is [kodim03_yuv420_8bpc.avif](io/kodim03_yuv420_8bpc.avif) converted to | |
| grayscale and tagged as Gamma 1.6 gAMA PNG chunk. | |
| #### File [kodim03_grayscale_gamma1.6-reference.png](kodim03_grayscale_gamma1.6-reference.png) | |
|  | |
| License: released by the Eastman Kodak Company for unrestricted usage | |
| It is [kodim03_grayscale_gamma1.6.png](kodim03_grayscale_gamma1.6.png) | |
| converted into sRGB colorspace by Chrome using "Capture Node Screenshot" | |
| in DevTools. | |
| #### File [kodim23_yuv420_8bpc.avif](io/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](io/cosmos1650_yuv444_10bpc_p3pq.avif) | |
|  | |
| License: [Creative Commons Attribution license (reuse allowed)](https://creativecommons.org/licenses/by/3.0/legalcode) | |
| Source: ["Cosmos Laundromat" movie](https://www.youtube.com/watch?v=Y-rmzh0PI3c) (frame at around 1 minute past the | |
| beginning) | |
| ### Files with high bit depth per channel | |
| #### File [weld_16bit.png](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](dog_exif_extended_xmp_icc.jpg) | |
|  | |
| License: [same as libavif](https://github.com/AOMediaCodec/libavif/blob/main/LICENSE) | |
| 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](paris_exif_xmp_icc.jpg) | |
|  | |
| License: [same as libavif](https://github.com/AOMediaCodec/libavif/blob/main/LICENSE) | |
| 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](paris_extended_xmp.jpg) | |
|  | |
| License: [same as libavif](https://github.com/AOMediaCodec/libavif/blob/main/LICENSE) | |
| 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](https://en.wikipedia.org/wiki/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](paris_xmp_trailing_null.jpg) | |
|  | |
| License: [same as libavif](https://github.com/AOMediaCodec/libavif/blob/main/LICENSE) | |
| 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](paris_icc_exif_xmp.png) | |
|  | |
| License: [same as libavif](https://github.com/AOMediaCodec/libavif/blob/main/LICENSE) | |
| 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](paris_icc_exif_xmp_at_end.png) | |
|  | |
| License: [same as libavif](https://github.com/AOMediaCodec/libavif/blob/main/LICENSE) | |
| 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](paris_exif_orientation_5.jpg) | |
|  | |
| License: [same as libavif](https://github.com/AOMediaCodec/libavif/blob/main/LICENSE) | |
| 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](paris_icc_exif_xmp.avif) | |
|  | |
| License: [same as libavif](https://github.com/AOMediaCodec/libavif/blob/main/LICENSE) | |
| Source: Encoded from `paris_icc_exif_xmp.png` using `avifenc -s 10` at commit ed52c1b. | |
| ### File [ffffcc-gamma1.6.png](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](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](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](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](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](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](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](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](ArcTriomphe-cHRM-red-green-swap.png) | |
| converted into sRGB colorspace by Chrome using "Capture Node Screenshot" | |
| in DevTools. | |
| ## Grid | |
| ### File [sofa_grid1x5_420.avif](sofa_grid1x5_420.avif) | |
|  | |
| License: [same as libavif](https://github.com/AOMediaCodec/libavif/blob/main/LICENSE) | |
| Source: Personal photo converted with `avifenc --grid 1x5 --yuv 420` at | |
| commit [632d131](https://github.com/AOMediaCodec/libavif/commit/632d13188f9b7faa40f20d870e792174b8b5b8e6). | |
| ### File [color_grid_alpha_nogrid.avif](color_grid_alpha_nogrid.avif) | |
|  | |
| License: [same as libavif](https://github.com/AOMediaCodec/libavif/blob/main/LICENSE) | |
| 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] | |
| ``` | |
| ### File [alpha_noispe.avif](alpha_noispe.avif) | |
| License: [same as libavif](https://github.com/AOMediaCodec/libavif/blob/main/LICENSE) | |
| Source: Same pixels as `color_grid_alpha_nogrid.avif` encoded with | |
| [`cavif-rs`](https://github.com/kornelski/cavif-rs) with the | |
| [alpha `ispe` fix](https://github.com/kornelski/avif-serialize/pull/4) removed. | |
| ## Gain Maps | |
| ### File [paris_exif_xmp_gainmap_littleendian.jpg](paris_exif_xmp_gainmap_littleendian.jpg) | |
|  | |
| License: [same as libavif](https://github.com/AOMediaCodec/libavif/blob/main/LICENSE) | |
| Source: Based on paris_exif_xmp_icc.jpg with ICC stripped out and a gain map added. | |
| Contains a MPF (Multi-Picture Format) segment with metadata pointing to a second image | |
| at offset 33487. The MPF metadata is in little endian order, as signaled by the four bytes | |
| 'II*\0'. | |
| | address | marker | length | data | | |
| |--------:|-------------|-------:|----------------------------------------------| | |
| | 0 | 0xffd8 SOI | | | | |
| | 2 | 0xffe0 APP0 | 16 | `JFIF.....,.,.` | | |
| | 20 | 0xffe1 APP1 | 838 | `Exif..II*......................` | | |
| | 1156 | 0xffe1 APP1 | 2808 | `http://ns.adobe.com/xap/1.0/.<?x` | | |
| | 3670 | 0xffe1 APP1 | 392 | `http://ns.adobe.com/xmp/extension/` | | |
| | 4064 | 0xffe2 APP2 | 88 | `MPF..II*..... ` | | |
| | | | | ... | | |
| | 33487 | 0xffd8 SOI | | | | |
| | 33489 | 0xffe0 APP0 | 16 | `JFIF.....,.,.` | | |
| | 33507 | 0xffe1 APP1 | 571 | `http://ns.adobe.com/xap/1.0/.<?x` | | |
| | | | | ... | | |
| ### File [paris_exif_xmp_gainmap_bigendian.jpg](paris_exif_xmp_gainmap_bigendian.jpg) | |
|  | |
| License: [same as libavif](https://github.com/AOMediaCodec/libavif/blob/main/LICENSE) | |
| Source: Same as paris_exif_xmp_gainmap_littleendian.jpg but manually edited with | |
| a hex editor to make the MPF metadata big endian, as signaled by the four bytes | |
| 'MM\0*'. | |
| | address | marker | length | data | | |
| |--------:|-------------|-------:|----------------------------------------------| | |
| | 0 | 0xffd8 SOI | | | | |
| | 2 | 0xffe0 APP0 | 16 | `JFIF.....,.,.` | | |
| | 20 | 0xffe1 APP1 | 838 | `Exif..II*......................` | | |
| | 1156 | 0xffe1 APP1 | 2808 | `http://ns.adobe.com/xap/1.0/.<?x` | | |
| | 3670 | 0xffe1 APP1 | 392 | `http://ns.adobe.com/xmp/extension/` | | |
| | 4064 | 0xffe2 APP2 | 88 | `MPF..MM.*.... ` | | |
| | | | | ... | | |
| | 33487 | 0xffd8 SOI | | | | |
| | 33489 | 0xffe0 APP0 | 16 | `JFIF.....,.,.` | | |
| | 33507 | 0xffe1 APP1 | 571 | `http://ns.adobe.com/xap/1.0/.<?x` | | |
| | | | | ... | | |
| ### File [paris_exif_xmp_icc_gainmap_bigendian.jpg](paris_exif_xmp_icc_gainmap_bigendian.jpg) | |
|  | |
| License: [same as libavif](https://github.com/AOMediaCodec/libavif/blob/main/LICENSE) | |
| Source: same as paris_exif_xmp_gainmap_bigendian.jpg but with a DCI-P3 ICC profile added | |
| using exiftool: | |
| ``` | |
| cp paris_exif_xmp_gainmap_bigendian.jpg paris_exif_xmp_icc_gainmap_bigendian.jpg | |
| exiftool -icc_profile -b path/to/some_image_with_a_p3_profile.jpg > p3.icc | |
| exiftool "-icc_profile<=p3.icc" paris_exif_xmp_icc_gainmap_bigendian.jpg | |
| ``` | |
| ### File [color_grid_gainmap_different_grid.avif](color_grid_gainmap_different_grid.avif) | |
|  | |
| License: [same as libavif](https://github.com/AOMediaCodec/libavif/blob/main/LICENSE) | |
| Source: generated with a modified libavif at https://github.com/maryla-uc/libavif/tree/weirdgainmaps | |
| Contains a 4x3 color grid, a 4x3 alpha grid, and a 2x2 gain map grid. | |
| ### File [color_nogrid_alpha_nogrid_gainmap_grid.avif](color_nogrid_alpha_nogrid_gainmap_grid.avif) | |
|  | |
| License: [same as libavif](https://github.com/AOMediaCodec/libavif/blob/main/LICENSE) | |
| Source: generated with a modified libavif at https://github.com/maryla-uc/libavif/tree/weirdgainmaps | |
| Contains a single color image, single alpha image, and a 2x2 gain map grid. | |
| ### File [color_grid_alpha_grid_gainmap_nogrid.avif](color_grid_alpha_grid_gainmap_nogrid.avif) | |
|  | |
| License: [same as libavif](https://github.com/AOMediaCodec/libavif/blob/main/LICENSE) | |
| Source: generated with a modified libavif at https://github.com/maryla-uc/libavif/tree/weirdgainmaps | |
| Contains a 4x3 color grid, a 4x3 alpha grid, and a single gain map image. | |
| ### File [seine_hdr_srgb.avif](seine_hdr_srgb.avif) | |
|  | |
| License: [same as libavif](https://github.com/AOMediaCodec/libavif/blob/main/LICENSE) | |
| Source : created from a personal photo, converted to HDR using Photoshop, see | |
| https://helpx.adobe.com/camera-raw/using/hdr-output.html and | |
| https://gregbenzphotography.com/hdr-images/jpg-hdr-gain-maps-in-adobe-camera-raw/ | |
| See also sources/seine.psd | |
| HDR image using the PQ transfer curve. Contains a gain map in | |
| [Adobe's format](https://helpx.adobe.com/camera-raw/using/gain-map.html) that is not recognized by | |
| libavif and ignored by the tests. | |
| ### File [seine_sdr_gainmap_srgb.jpg](seine_sdr_gainmap_srgb.avif) | |
|  | |
| License: [same as libavif](https://github.com/AOMediaCodec/libavif/blob/main/LICENSE) | |
| Source : created from a personal photo, converted to HDR using Photoshop, then saved as JPEG+gainmap, | |
| see https://helpx.adobe.com/camera-raw/using/hdr-output.html and | |
| https://gregbenzphotography.com/hdr-images/jpg-hdr-gain-maps-in-adobe-camera-raw/ | |
| ### File [seine_hdr_rec2020.avif](seine_hdr_rec2020.avif) | |
|  | |
| License: [same as libavif](https://github.com/AOMediaCodec/libavif/blob/main/LICENSE) | |
| Source : same as seine_hdr_srgb but saved with the Rec. 2020 color space in Photoshop (Camera Raw 16.0.1.1683). | |
| ### File [seine_sdr_gainmap_srgb.avif](seine_sdr_gainmap_srgb.avif) | |
|  | |
| License: [same as libavif](https://github.com/AOMediaCodec/libavif/blob/main/LICENSE) | |
| Source : created from `seine_sdr_gainmap_srgb.jpg` converted to avif with avifenc built | |
| with AVIF_ENABLE_EXPERIMENTAL_GAIN_MAP and AVIF_ENABLE_LIBXML2 then: | |
| ``` | |
| # from libavif/mybuilddir/ | |
| ./avifenc ../tests/data/seine_sdr_gainmap_srgb.jpg ../tests/data/seine_sdr_gainmap_srgb.avif --qcolor 90 --qgain-map 90 --ignore-icc | |
| ``` | |
| SDR image with a gain map to allow tone mapping to HDR. | |
| ### File [seine_sdr_gainmap_big_srgb.avif](seine_sdr_gainmap_big_srgb.avif) | |
|  | |
| Source : modified version of `seine_sdr_gainmap_srgb.avif` with an upscaled gain map, generated using libavif's API. | |
| See `CreateTestImages` in `avifgainmaptest.cc` (set kUpdateTestImages to update images). | |
| SDR image with a gain map to allow tone mapping to HDR. The gain map's width and height are doubled compared to the base image. | |
| This is an atypical image just for testing. Typically, the gain map would be either the same size or smaller as the base image. | |
| ### File [seine_hdr_gainmap_srgb.avif](seine_hdr_gainmap_srgb.avif) | |
|  | |
| License: [same as libavif](https://github.com/AOMediaCodec/libavif/blob/main/LICENSE) | |
| Source : created from `seine_hdr_srgb.avif` (for the base image) and `seine_sdr_gainmap_srgb.avif` (for the gain map) with libavif's API. | |
| See `CreateTestImages` in `avifgainmaptest.cc` (set kUpdateTestImages to update images). | |
| HDR image with a gain map to allow tone mapping to SDR. | |
| ### File [seine_hdr_gainmap_small_srgb.avif](seine_hdr_gainmap_small_srgb.avif) | |
|  | |
| License: [same as libavif](https://github.com/AOMediaCodec/libavif/blob/main/LICENSE) | |
| Source : modified version of `seine_hdr_gainmap_srgb.avif` with a downscaled gain map, generated using libavif's API. | |
| See `CreateTestImages` in `avifgainmaptest.cc` (set kUpdateTestImages to update images). | |
| SDR image with a gain map to allow tone mapping to HDR. The gain map's width and height are halved compared to the base image. | |
| ## Files colors*_hdr_*.avif and colors*_sdr_srgb.avif | |
|  | |
| SDR and HDR (PQ) AVIF images in various colorspaces. | |
| The files with 'wcg' (wide color gamut) in their name have colors outside of the sRGB color space. | |
| The files without 'wcg' in their name have sRGB colors, but expressed in various color spaces. | |
| The files with 'text' in their name have text on them. They are not currently used in tests but can be used for manual | |
| testing of gain maps (e.g. with `avifgainmaputil combine ...`), as they make it easy to see which version | |
| the browser is displaying. | |
| HDR/wide color gamut images should be viewed on an HDR display, such as on a M1+ Mac Book Pro. | |
| Source : created with Photoshop 25.1.0 (Camera Raw 16.0.1.1683), see sources/colors.psd and | |
| https://helpx.adobe.com/camera-raw/using/hdr-output.html, | |
| https://gregbenzphotography.com/hdr-images/jpg-hdr-gain-maps-in-adobe-camera-raw/ | |
| Basic process: create a 32bit image, export it as png for the SDR version. | |
| Then open the Camera Raw filter (Filter > Camera Raw Filter...), click HDR at the top right, and drag | |
| the histogram towards the right to create brighter pixels. | |
| Click the save icon on the top right. Select AVIF as output format and check "HDR output" then save. | |
| To create an image with a wider color gamut, choose Edit > Assign Profile... and set the color space | |
| to e.g. BT 2020. | |
| To export more images from sources/colors.psd: | |
| - For SDR, show/hide the layers as desired then export to PNG then convert to avif with avifenc | |
| - For HDR, show/hide the layers as desired then flatten the image, (Layers > Flatten Image), open | |
| the Camera Raw dialog, and click the save icon on the top right. | |
| - For the wide color gamut version, choose Edit > Assign Profile... and set the color space to | |
| Rec.ITU-R BT.2020-1 | |
| ## Animated Images | |
| ### File [colors-animated-8bpc.avif](colors-animated-8bpc.avif) | |
|  | |
| License: [same as libavif](https://github.com/AOMediaCodec/libavif/blob/main/LICENSE) | |
| Source: Random colors generated with ffmpeg. | |
| An animated AVIF image file with the following attributes: | |
| * Width: 150 | |
| * Height: 150 | |
| * Alpha present: No | |
| * YUV Format: 420 | |
| * Repetition Count: 0 | |
| * Frame count: 5 | |
| ### File [colors-animated-8bpc-alpha-exif-xmp.avif](colors-animated-8bpc-alpha-exif-xmp.avif) | |
|  | |
| License: [same as libavif](https://github.com/AOMediaCodec/libavif/blob/main/LICENSE) | |
| Source: `colors-animated-8bpc.avif` but translucent and with the Exif/XMP chunks of | |
| `paris_exif_xmp_icc.jpg`. The repetition is infinite. | |
| # Other Test Files | |
| ### File [sRGB2014.icc](sRGB2014.icc) | |
| License: [Copyright International Color Consortium, 2015](https://www.color.org/profiles2.xalter#license) | |
| Source: https://www.color.org/srgbprofiles.xalter#v2 |