restructure

technology/files/media/image/AVIF.md

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+---
+obj: codec
+website: https://aomediacodec.github.io/av1-avif
+---
+# AVIF
+AV1 Image File Format (AVIF) is an open, royalty-free image file format specification for storing images or image sequences compressed with AV1 in the HEIF container format. It competes with HEIC, which uses the same container format built upon ISOBMFF, but HEVC for compression. Version 1.0.0 of the AVIF specification was finalized in February 2019.
+
+| Name                | Value        |
+| ------------------- | ------------ |
+| Filename extension  | .avif        |
+| Internet media type | `image/avif` |
+
+## Features
+The AV1 Image File Format supports:
+- Multiple color spaces, including:
+    - HDR (with PQ or HLG transfer functions and BT.2020 color primaries, as part of BT.2100)
+    - SDR (with sRGB/ BT.709 / BT.601 or with wide color gamut
+    - Color space signaling via CICP (ITU-T H.273 and ISO/IEC 23091-2) or ICC profiles
+- Lossless compression and lossy compression
+- 8-, 10-, and 12-bit color depths
+- Monochrome (alpha/depth) or multi-components
+- 4:2:0, 4:2:2, 4:4:4 chroma subsampling and RGB
+- Film grain synthesis
+- Image sequences/animation
+
+## Usage
+
+**Convert from AVIF:**
+```shell
+avifdec [INPUT] [OUTPUT]
+```
+
+**Get information**
+```shell
+avifdec --info [INPUT]
+```
+
+**Convert to AVIF**
+```shell
+avifenc [OPTIONS] [INPUT] [OUTPUT]
+```
+
+_Flags:_
+```shell
+-j, --jobs <NUM> Number of threads
+-l, --lossless Lossless encoding
+```

technology/files/media/image/PNG.md

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+---
+obj: codec
+---
+# PNG
+Portable Network Graphics (PNG) is a raster-graphics file format that supports lossless data compression. PNG was developed as an improved, non-patented replacement for Graphics Interchange Format (GIF) — unofficially, the initials PNG stood for the recursive acronym "PNG's not GIF".
+
+PNG supports palette-based images (with palettes of 24-bit RGB or 32-bit RGBA colors), grayscale images (with or without an alpha channel for transparency), and full-color non-palette-based RGB or RGBA images. The PNG working group designed the format for transferring images on the Internet, not for professional-quality print graphics; therefore non-RGB color spaces such as CMYK are not supported. A PNG file contains a single image in an extensible structure of chunks, encoding the basic pixels and other information such as textual comments and integrity checks documented in RFC 2083.
+
+PNG files use the file extension PNG or png and are assigned [MIME](../../MIME.md) media type image/png. PNG was published as informational RFC 2083 in March 1997 and as an ISO/IEC 15948 standard in 2004.
+
+| Name         | Value                     |
+| ------------ | ------------------------- |
+| Extension    | .png                      |
+| [MIME](../../MIME.md)         | image/png                 |
+| Magic Number | `89 50 4e 47 0d 0a 1a 0a` |