v4(fill:key:)

A 4-bit grayscale color format.

PNG.Format.swift:54

case v4(fill: UInt8?, key: UInt8?)

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s3PNGAAO6FormatO2v4yADs5UInt8VSg_AHtcADmFWhat are these?

FNV24: [9IDF0]

Parameters

fill: An optional background color. The sample is unscaled, and must be in the range 0 ... 15. Most PNG viewers ignore this field.
key: An optional chroma key. If present, pixels matching it will be displayed as transparent, if possible. The sample is unscaled, and must be in the range 0 ... 15.

This color format has a pixel format of v4.

Other cases

case v1(fill: UInt8?, key: UInt8?)
A 1-bit grayscale color format.
case v2(fill: UInt8?, key: UInt8?)
A 2-bit grayscale color format.
case v8(fill: UInt8?, key: UInt8?)
An 8-bit grayscale color format.
case v16(fill: UInt16?, key: UInt16?)
A 16-bit grayscale color format.
case bgr8(palette: [(b: UInt8, g: UInt8, r: UInt8)], fill: (b: UInt8, g: UInt8, r: UInt8)?, key: (b: UInt8, g: UInt8, r: UInt8)?)
An 8-bit BGR color format.
case rgb8(palette: [(r: UInt8, g: UInt8, b: UInt8)], fill: (r: UInt8, g: UInt8, b: UInt8)?, key: (r: UInt8, g: UInt8, b: UInt8)?)
An 8-bit RGB color format.
case rgb16(palette: [(r: UInt8, g: UInt8, b: UInt8)], fill: (r: UInt16, g: UInt16, b: UInt16)?, key: (r: UInt16, g: UInt16, b: UInt16)?)
A 16-bit RGB color format.
case indexed1(palette: [(r: UInt8, g: UInt8, b: UInt8, a: UInt8)], fill: Int?)
A 1-bit indexed color format.
case indexed2(palette: [(r: UInt8, g: UInt8, b: UInt8, a: UInt8)], fill: Int?)
A 2-bit indexed color format.
case indexed4(palette: [(r: UInt8, g: UInt8, b: UInt8, a: UInt8)], fill: Int?)
A 4-bit indexed color format.
case indexed8(palette: [(r: UInt8, g: UInt8, b: UInt8, a: UInt8)], fill: Int?)
An 8-bit indexed color format.
case va8(fill: UInt8?)
An 8-bit grayscale-alpha color format.
case va16(fill: UInt16?)
A 16-bit grayscale-alpha color format.
case bgra8(palette: [(b: UInt8, g: UInt8, r: UInt8)], fill: (b: UInt8, g: UInt8, r: UInt8)?)
An 8-bit BGRA color format.
case rgba8(palette: [(r: UInt8, g: UInt8, b: UInt8)], fill: (r: UInt8, g: UInt8, b: UInt8)?)
An 8-bit RGBA color format.
case rgba16(palette: [(r: UInt8, g: UInt8, b: UInt8)], fill: (r: UInt16, g: UInt16, b: UInt16)?)
A 16-bit RGBA color format.