Just Solve the File Format Problem - User contributions [en]

BPG

2020-05-30T17:27:39Z

SilverbackNet:

{{FormatInfo
|formattype=electronic
|subcat=Graphics
|extensions={{ext|bpg}}
|pronom={{PRONOM|fmt/687}}
|released=2014
}}
'''BPG''' (Better Portable Graphics) is a compressed raster graphic format, using [[HEVC]] to encode pictures. Animation, deep color, and metadata are supported. The format is experimental and not natively supported by browsers; a Javascript loader is available that converts BPG to [[PNG]] for display. The bitstream format is very similar to raw HEVC.

<code>image/bpg</code> has been suggested for the MIME type, but none is formally registered.

== Identification ==
BPG files start with the following 4-byte magic pattern: <code>42 50 47 fb</code>.

== Specs ==
* [http://bellard.org/bpg/bpg_spec.txt BPG Specification]

== See Also ==
* [[HEIF]]
* [[AVIF]]

== Software ==
* [[Tom's Editor]]
* [https://bellard.org/bpg/ libbpg]
* [[ImageMagick]]

== Sample files ==
* [http://bellard.org/bpg/lena.html Comparison with JPEG] (actual BPG files: [http://bellard.org/bpg/lena_q36.bpg lena_q36.bpg], [http://bellard.org/bpg/lena_q32.bpg lena_q32.bpg], [http://bellard.org/bpg/lena_q28.bpg lena_q28.bpg], [http://bellard.org/bpg/lena_q23.bpg lena_q23.bpg])
* [http://bellard.org/bpg/gallery1.html Wikipedia pictures] (actual BPG files: [http://bellard.org/bpg/003.bpg 003.bpg],[http://bellard.org/bpg/005.bpg 005.bpg])
* [http://bellard.org/bpg/gallery2.html Images with alpha channel] (actual BPG files: [http://bellard.org/bpg/2.bpg 2.bpg],[http://bellard.org/bpg/2small.bpg 2small.bpg], [http://bellard.org/bpg/3.bpg 3.bpg], [http://bellard.org/bpg/5.bpg 5.bpg])
* https://telparia.com/fileFormatSamples/image/test.bpg

== Links ==
* [https://bellard.org/bpg/bpg_spec.txt Official format specification]
* [http://bellard.org/bpg/ Official site]
* [[Wikipedia:Better Portable Graphics|Wikipedia article]]
* [http://lwn.net/Articles/625535/ BPG, a still-image format from video compression]
* [https://news.ycombinator.com/item?id=8704629 Some discussion]
* [https://issues.apache.org/jira/browse/TIKA-1491 Identification of BPG format]
* [http://xooyoozoo.github.io/yolo-octo-bugfixes/ Online demonstrator]- shows quality differences between similarly-sized images in [[JPEG]], [[JP2]], [[WebP]] and [[BPG]] formats
* [https://github.com/mirrorer/libbpg Unofficial Github mirror]

HEIF

2020-05-30T14:38:53Z

SilverbackNet: remove completely spurious and false "Not valid ISO-BMFF" claim

{{FormatInfo
|formattype=electronic
|subcat=Graphics
|extensions={{ext|heic}}, {{ext|heif}}
|pronom={{PRONOM|fmt/1101}}
|wikidata={{wikidata|Q24907733}}
|released=2017
}}
'''HEIF''' (High Efficiency Image File Format) is the lossy image and animation format defined by [[MPEG-H]] Part 12 (ISO/IEC 23008-12). It is based on [[ISO Base Media File Format|ISO-BMFF]], and supports arbitrary colorspaces, codecs, and compositing of images, with [[HEVC]], [[H.264|AVC]], and [[JPEG]] being defined in the initial spec.

== Format details ==
The standard defines:
* A still image ("image collection") container format, with brand <code>mif1</code>.
* An animated image ("image sequence") container format, with brand <code>msf1</code>.
* An image compression scheme, with brand <code>heic</code>, based on [[HEVC]].
* Various other compression schemes, including [[H.264|AVC]] and [[JPEG]].
* Compositing and layering of multiple images, including transparency.

The file extension '''.heic''' typically denotes single still images using [[HEVC]] in 8- or 10-bit. '''.heif''' may include any of the wider features.

== Identifiers ==
Based on source code and sample files, it usually uses the [[Boxes/atoms format#Brands|brands]] <code>mif1</code> and <code>heic</code>. Some files may use other brands, such as <code>msf1</code> and <code>heix</code>.

== See also ==
* [[AVIF]]
* [[HEVC]]
* [[MIAF]]
* [[BPG]]

== Software ==
* [https://github.com/nokiatech/heif Nokia Technologies HEIF Reader/Writer Engine]
* [https://github.com/strukturag/libheif libheif]
* [http://snisurset.net/code/abydos/ abydos]

== Sample files ==
* Some of the links in [https://newsgroup.xnview.com/viewtopic.php?f=60&t=32568#p129428 this forum post] might still work
* [https://github.com/thorsted/digicam_corpus/tree/master/Apple/iPhone%20XR iPhone XR sample images]
* https://telparia.com/fileFormatSamples/image/abydos/abydos.heic

== Links ==
* [[Wikipedia: High Efficiency Image File Format]]
* [http://mpeg.chiariglione.org/standards/mpeg-h/image-file-format HEIF information from the MPEG website]
* [https://nokiatech.github.io/heif/ HEIF information from Nokia Technologies]
* [https://www.iso.org/standard/66067.html ISO/IEC 23008-12] (not free to download)
* [https://www.cnet.com/news/apple-ios-boosts-heif-photos-over-jpeg-wwdc/ How Apple is squeezing more photos into your iPhone]

See also [[MPEG-H#Links]].

[[Category:MPEG]]
[[Category:Nokia]]
[[Category:Box file format]]

AVIF

2020-05-30T14:19:28Z

SilverbackNet: details

{{FormatInfo
|formattype=electronic
|subcat=Graphics
|extensions={{ext|avif}}, {{ext|avifs}}
|mimetypes={{mimetype|image/avif}}, {{mimetype|image/avif-sequence}}
|wikidata={{wikidata|Q59913607}}
|released=2018 (draft), 2019 (v1.0.0)
}}
[[AVIF]] (AV1 Image File Format) is an image and animation file format, an extension of [[HEIF]] allowing images encoded with [[AV1]]. Most files will only have AV1-encoded images, but a mixture of different encodings is allowed. Early draft versions were named ''AV1 Still Image File Format''.

== Identification ==
The [[Boxes/atoms format#Brands|brands]] "<code>avif</code>" and either "<code>MA1B</code>" or "<code>MA1A</code>" are present.

== Specifications ==
* [https://aomediacodec.github.io/av1-avif/ AV1 Image File Format (AVIF)]
** [https://github.com/AOMediaCodec Related GitHub projects]

== Software ==
* [https://github.com/AOMediaCodec/libavif libavif]

== Links ==
* [[Wikipedia: AV1#AV1 Image File Format (AVIF)]]

[[Category:Box file format]]