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- ICTCP, ICtCp, or ITP is a color representation format specified in the Rec. ITU-R BT.2100 standard that is used as a part of the color image pipeline in video and digital photography systems for high dynamic range (HDR) and wide color gamut (WCG) imagery. It was developed by Dolby Laboratories from the IPT color space by Ebner and Fairchild. The format is derived from an associated RGB color space by a coordinate transformation that includes two matrix transformations and an intermediate nonlinear transfer function that is informally known as gamma pre-correction. The transformation produces three signals called I, CT, and CP. The ICTCP transformation can be used with RGB signals derived from either the perceptual quantizer (PQ) or hybrid log–gamma (HLG) nonlinearity functions, but is most commonly associated with the PQ function (which was also developed by Dolby). The I ("intensity") component is a luma component that represents the brightness of the video, and CT and CP are blue-yellow (named from tritanopia) and red-green (named from protanopia) chroma components. Ebner also used IPT as short for "Image Processing Transform". The ICTCP color representation scheme is conceptually related to the LMS color space, as the color transformation from RGB to ICTCP is defined by first converting RGB to LMS with a 3×3 matrix transformation, then applying the nonlinearity function, and then converting the nonlinear signals to ICTCP using another 3×3 matrix transformation. ICTCP was defined as YCC digital format with support for 4:4:4, 4:2:2 and 4:2:0 chroma subsampling in CTA-861-H (that means that in limited range 10 bit mode 0, 1, 2, 3, 1020, 1021, 1022, 1023 values are reserved). (en)
- ICTCP（ICtCp、ITP）は、ITU-R BT.2100で規定された色空間である。ハイダイナミックレンジ（HDR）や広色域（WCG）を扱うビデオやデジタル写真のカラー画像パイプラインの一部として使用される。ドルビーラボラトリーズによって開発された。このフォーマットは、2つの行列変換と非線形の伝達関数を含む座標変換によって、関連するRGB色空間から変換できる。 この変換によってI、CT、CPという3つの信号が生成される。ICTCPは（Perceptual Quantizer）方式および（HLG）方式のどちらでも使用できるが、ICTCPと同じくドルビーによって開発されたPQ方式とともに使用されるのが最も一般的である。 I（intensity=強度）は明るさを表す輝度成分であり、CTとCPはそれぞれ青-黄（tritan=3型色覚に由来）および赤-緑（protan=1型色覚に由来）を表す色差成分である。 (ja)
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- What does this mean? (en)
- It either describes this or it doesn't. Someone fluent in patent-ese needs to read this and provide a definitive "describes" vs. a "seems to" (en)
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- seems to describe how Dolby changed the domain to PQ by changing the traditional power function from 1998 IPT paper to PQ function for each of LMS components. (en)
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- ICTCP（ICtCp、ITP）は、ITU-R BT.2100で規定された色空間である。ハイダイナミックレンジ（HDR）や広色域（WCG）を扱うビデオやデジタル写真のカラー画像パイプラインの一部として使用される。ドルビーラボラトリーズによって開発された。このフォーマットは、2つの行列変換と非線形の伝達関数を含む座標変換によって、関連するRGB色空間から変換できる。 この変換によってI、CT、CPという3つの信号が生成される。ICTCPは（Perceptual Quantizer）方式および（HLG）方式のどちらでも使用できるが、ICTCPと同じくドルビーによって開発されたPQ方式とともに使用されるのが最も一般的である。 I（intensity=強度）は明るさを表す輝度成分であり、CTとCPはそれぞれ青-黄（tritan=3型色覚に由来）および赤-緑（protan=1型色覚に由来）を表す色差成分である。 (ja)
- ICTCP, ICtCp, or ITP is a color representation format specified in the Rec. ITU-R BT.2100 standard that is used as a part of the color image pipeline in video and digital photography systems for high dynamic range (HDR) and wide color gamut (WCG) imagery. It was developed by Dolby Laboratories from the IPT color space by Ebner and Fairchild. The format is derived from an associated RGB color space by a coordinate transformation that includes two matrix transformations and an intermediate nonlinear transfer function that is informally known as gamma pre-correction. The transformation produces three signals called I, CT, and CP. The ICTCP transformation can be used with RGB signals derived from either the perceptual quantizer (PQ) or hybrid log–gamma (HLG) nonlinearity functions, but is most (en)
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