Материал: part17

profile that, in conjunction​ with the AsShotPre​ ProfileMatrix tag, provides​ the camera manufacturer​ with a way to specify a​ defaultcolorrenderingfrom​ camera color space​ coordinates (linear​ reference values) into the​ ICC profile connection​ space. The ICC profile​ connection space is an​ outputreferredcolorimetric​ space, whereas the other​ color calibration tags in​ DNG specify a conversion​ into a scene referred​ colorimetric space. This​ means that the rendering​ in this profile should​ include any desired tone​ and gamut mapping​ neededtoconvertbetween​ scene referred values and​ output referred values.​

0xc690​50832​Image​ AsShotPreProfileMatrix​SRational​This tag is used in​ conjunction with the As​ ShotICCProfile tag. It​ specifies a matrix that​ should be applied to the​ camera color space​ coordinates before​ processing the values​ through the ICC profile​ specified in the As​ ShotICCProfile tag. The​ matrix is stored in the row​ scan order. If ColorPlanes​ is greater than three, then​ this matrix can (but is not​ required to) reduce the​ dimensionality of the color​ data down to three​ components,inwhichcase​ the AsShotICCProfile​ should have three rather​ than ColorPlanes input​ components.​

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conjunction with the​ CurrentPreProfileMatrix​ tag.TheCurrentICCProfile​ and CurrentPreProfile​ Matrix tags have the same​ purpose and usage as the​ AsShotICCProfile and As​ ShotPreProfileMatrix tag​ pair, except they are for​ use by raw file editors​ rather than camera​ manufacturers.​

0xc692​50834​Image​ CurrentPreProfileMatrix​SRational​This tag is used in​ conjunction with the​ CurrentICCProfiletag.The​ CurrentICCProfile and​ CurrentPreProfileMatrix​ tags have the same​ purpose and usage as the​ AsShotICCProfile and As​ ShotPreProfileMatrix tag​ pair, except they are for​ use by raw file editors​ rather than camera​ manufacturers.​

0xc6bf​50879​Image​ ColorimetricReference​ Short​ The DNG color model​ documents a transform​ between camera colors​ and CIE XYZ values. This​ tag describes the​ colorimetric reference for​ the CIE XYZ values. 0 =​ The XYZ values are​ scene-referred. 1 = The​ XYZ values are​ output-referred, using the​ ICC profile perceptual​ dynamic range. This tag​ allowsoutput-referreddata​ to be stored in DNG files​ and still processed​ correctly by DNG readers.​

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0xc6f7​50935​Image​ NoiseReductionApplied​Rational​This tag indicates how​ much noise reduction has​ been applied to the raw​ data on a scale of 0.0 to​ 1.0. A 0.0 value indicates​ thatnonoisereductionhas​ been applied. A 1.0 value​ indicates that the "ideal"​ amount of noise reduction​ has been applied, i.e. that​ theDNGreadershouldnot​ apply additional noise​ reduction by default. A​ value of 0/0 indicates that​ thisparameterisunknown.​

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single camera profile​ stored in the file but is​ required for all camera​ profiles if there is more​ than one camera profile​ stored in the file.​

0xc6f9​50937​Image​ ProfileHueSatMapDims​ Long​ This tag specifies the​ numberofinputsamplesin​ each dimension of the​ hue/saturation/value​ mapping tables. The data​ for these tables are stored​ inProfileHueSatMapData1​ and ProfileHueSat​ MapData2 tags. The most​ common case has Value​ Divisions equal to 1, so​ onlyhueandsaturationare​ used as inputs to the​ mapping table.​

0xc6fa​50938​Image​ ProfileHueSatMapData1​ Float​ This tag contains the data​ for the first​ hue/saturation/value​ mapping table. Each entry​ of the table contains three​ 32-bit IEEE floating-point​ values. The first entry is​ hue shift in degrees; the​ second entry is saturation​ scale factor; and the third​ entry is a value scale​ factor.Thetableentriesare​ stored in the tag in nested​ loop order, with the value​ divisions in the outer loop,​ the hue divisions in the​ middle loop, and the​ saturation divisions in the​ inner loop. All zero input​ saturation entries are​ required to have a value​ scale factor of 1.0.​

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