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webp-container-spec: move terms from intro section
to 'Terminology & Basics' Change-Id: Iec9923086a2d339f12025c55da53b1e8a6919380
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@ -47,22 +47,22 @@ support for the following:
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* Animation: An image may have multiple frames with pauses between them,
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* Animation: An image may have multiple frames with pauses between them,
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making it an animation.
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making it an animation.
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Terminology & Basics
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--------------------
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The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD",
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The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD",
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"SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this
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"SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this
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document are to be interpreted as described in BCP 14 [RFC 2119][] [RFC 8174][]
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document are to be interpreted as described in BCP 14 [RFC 2119][] [RFC 8174][]
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when, and only when, they appear in all capitals, as shown here.
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when, and only when, they appear in all capitals, as shown here.
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Bit numbering in chunk diagrams starts at `0` for the most significant bit
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('MSB 0'), as described in [RFC 1166][].
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Terminology & Basics
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--------------------
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A WebP file contains either a still image (that is, an encoded matrix of pixels)
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A WebP file contains either a still image (that is, an encoded matrix of pixels)
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or an [animation](#animation). Optionally, it can also contain transparency
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or an [animation](#animation). Optionally, it can also contain transparency
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information, a color profile and metadata. We refer to the matrix of pixels as
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information, a color profile and metadata. We refer to the matrix of pixels as
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the _canvas_ of the image.
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the _canvas_ of the image.
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Bit numbering in chunk diagrams starts at `0` for the most significant bit
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('MSB 0'), as described in [RFC 1166][].
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Below are additional terms used throughout this document:
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Below are additional terms used throughout this document:
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_Reader/Writer_
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_Reader/Writer_
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