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...B (red, green and blue) and one pixel for the [[alpha channel]]. The alpha channel allows transparency information to be stored per pixel.

...idered fully opaque, except when color0 <= color1. In that case, the alpha channel of color3 is considered fully transparent. uint64_t alpha;

# 16bpp (16bits per channel x 1 channel) Grayscale Fixed Point. # 16bpp (16bits per channel x 1 channel) Grayscale Floating Point.

* 32 bit, RGB + one byte for the alpha-channel. ([[PIX_FMT_RGBA]])

...bits of the unit. The upper bit can either be a don't-care value, an alpha channel bit, or carry other scheme-specific information. ...Sometimes the extra byte is a don't-care value. Sometimes it denotes alpha channel transparency information.

...the alpha value is always 0x80. Images which truly make use of the alpha channel have been observed, but not explored in detail yet.

...in little-endian order. The most significant bit is used as a 1-bit alpha channel.

* tRNS contains transparency information. For indexed images, it stores alpha channel values for one or more palette entries. For truecolor and greyscale images, ...the same number of bits allocated per pixel (known as the bitdepth of the channel). Although the PNG specification always talks about the bitdepth of channel

* RGB32 has 4 (the 4th plane is probalby alpha channel) ...a, there is a fourth set used for the 4th plane of data (probably an alpha channel).

= Management Channel (MGMT) = ...ority (see below). The channel is closed following negotiation of the data channel parameters. Parameters are listed below.

...it more compressible (similar to Huffyuv's median prediction). Next, each channel is compressed independently. The channels will have a modified run-length c ...he channels are compressed independently & uses a separate thread for each channel. The output data is the same regardless of whether or not multithreading is

* 4 - 'r408' (8-bit 4:4:4:4 with alpha) * 5 - 'v408' (8-bit 4:4:4:4 with alpha and super black)

* [http://www.hydrogenaudio.org/forums/index.php?showtopic=50958 Alpha testing thread from hydrogenaudio.org] supported multi-channel input)

...which previously required the use of a separate PGM image for the opacity channel. In theory, PAM can be extended to represent colour models like CMYK, and e

...l-quality pixel formats, including RGB[A], and Y'CbCr[A]; with and without alpha; 10-bit and 8-bit; full-range and video-range; 4:4:4[:4] and 4:2:2[:4]; pro Each of the 6 main specific codecs supports an optional alpha channel, and each has both a progressive coding mode and an interlaced coding mode,

11 - Alpha channel scaler

SND2 chunk is split into two halfs. The first half contains the left channel sound and the second half contains the right channel. The layout of

* "left" (predicts the previous sample from the same channel) The error signal in each channel is encoded with its own Huffman table. On compression HuffYUV picks appropr

:* <code>C444alpha</code> = 4:4:4 plus a alpha channel of the same size (not supported by libwebm)

*b32a "Apple 32-bit Gray with Alpha" *blnd "Alpha Compositor"