Материал: part17

Page 926​

DICOM Tag​ Attribute​

DICOM​

EXIF​ EXIF​EXIF or​ EXIF or TIFF Key​

EXIF or​

EXIF or TIFF Tag​

Name​

Module​

orTIFF​ or​

TIFF​

TIFFType​

Description​

Tag​ TIFF​

IFD​

(hex)​ Tag​

(dec)​

0xc61e​50718​Image​ DefaultScale​

Rational​DefaultScaleisrequiredfor​

cameras with non-square​

pixels. It specifies the​

default scale factors for​

each direction to convert​

theimagetosquarepixels.​

Typically these factors are​

selected to approximately​

preserve total pixel count.​

For CFA images that use​

CFALayout equal to 2, 3,​

4, or 5, such as the Fujifilm​

SuperCCD, these two​

valuesshouldusuallydiffer​

by a factor of 2.0.​

0xc61f​50719​Image​ DefaultCropOrigin​

Short​ Raw images often store​

extra pixels around the​

edges of the final image.​

These extra pixels help​

prevent interpolation​

artifacts near the edges of​

the final image. Default​

CropOrigin specifies the​

origin of the final image​

area, in raw image​

coordinates(i.e.,beforethe​

DefaultScale has been​

applied), relative to the​

top-leftcorneroftheActive​

Area rectangle.​

0xc620​50720​Image​ DefaultCropSize​

Short​ Raw images often store​

extra pixels around the​

edges of the final image.​

Page 927​

DICOM Tag​ Attribute​

DICOM​

EXIF​ EXIF​EXIF or​ EXIF or TIFF Key​

EXIF or​

EXIF or TIFF Tag​

Name​

Module​

orTIFF​ or​

TIFF​

TIFFType​

Description​

Tag​ TIFF​

IFD​

(hex)​ Tag​

(dec)​

0xc621​50721​Image​ ColorMatrix1​

SRational​ColorMatrix1 defines a​

transformation matrix that​

converts XYZ values to​

reference camera native​

color space values, under​

the first calibration​

illuminant. The matrix​

values are stored in row​

scan order. The Color​

Matrix1 tag is required for​

all non-monochrome DNG​

files.​

0xc622​50722​Image​ ColorMatrix2​

SRational​ColorMatrix2 defines a​

transformation matrix that​

converts XYZ values to​

reference camera native​

color space values, under​

the second calibration​

illuminant. The matrix​

values are stored in row​

scan order.​

0xc623​50723​Image​ CameraCalibration1​

SRational​CameraCalibration1​

definesacalibrationmatrix​

Page 928​

DICOM Tag​ Attribute​

DICOM​

EXIF​ EXIF​EXIF or​ EXIF or TIFF Key​

EXIF or​

EXIF or TIFF Tag​

Name​

Module​

orTIFF​ or​

TIFF​

TIFFType​

Description​

Tag​ TIFF​

IFD​

(hex)​ Tag​

(dec)​

0xc624​50724​Image​ CameraCalibration2​

SRational​CameraCalibration2​

definesacalibrationmatrix​

that transforms reference​

camera native space​

valuestoindividualcamera​

native space values under​

the second calibration​

illuminant. The matrix is​

stored in row scan order.​

This matrix is stored​

separately from the matrix​

specified by the Color​

Matrix2 tag to allow raw​

converters to swap in​

replacementcolormatrices​

based on Unique​

CameraModel tag, while​

still taking advantage of​

any per-individual camera​

calibration performed by​

the camera manufacturer.​

0xc625​50725​Image​ ReductionMatrix1​

SRational​ReductionMatrix1 defines​

a dimensionality reduction​

matrix for use as the first​

stage in converting color​

camera native space​

values to XYZ values,​

under the first calibration​

illuminant. This tag may​

onlybeusedifColorPlanes​

is greater than 3. The​

matrixisstoredinrowscan​

order.​

0xc626​50726​Image​ ReductionMatrix2​

SRational​ReductionMatrix2 defines​

a dimensionality reduction​

matrix for use as the first​

Page 929​

DICOM Tag​ Attribute​

DICOM​

EXIF​ EXIF​EXIF or​ EXIF or TIFF Key​

EXIF or​

EXIF or TIFF Tag​

Name​

Module​

orTIFF​ or​

TIFF​

TIFFType​

Description​

Tag​ TIFF​

IFD​

(hex)​ Tag​

(dec)​

0xc627​50727​Image​ AnalogBalance​

Rational​Normally the stored raw​

values are not white​

balanced, since any digital​

whitebalancingwillreduce​

the dynamic range of the​

final image if the user​

decides to later adjust the​

white balance; however, if​

camera hardware is​

capable of white balancing​

the color channels before​

thesignalisdigitized,itcan​

improvethedynamicrange​

of the final image. Analog​

Balance defines the gain,​

either analog​

(recommended) or digital​

(not recommended) that​

has been applied the​

stored raw values.​

0xc628​50728​Image​ AsShotNeutral​

Short​ Specifies the selected​

white balance at time of​

capture, encoded as the​

coordinates of a perfectly​

neutral color in linear​

reference space values.​

The inclusion of this tag​

precludes the inclusion of​

the AsShotWhiteXY tag.​

0xc629​50729​Image​ AsShotWhiteXY​

Rational​Specifies the selected​

white balance at time of​

Page 930​

DICOM Tag​ Attribute​

DICOM​

EXIF​ EXIF​EXIF or​ EXIF or TIFF Key​

EXIF or​

EXIF or TIFF Tag​

Name​

Module​

orTIFF​ or​

TIFF​

TIFFType​

Description​

Tag​ TIFF​

IFD​

(hex)​ Tag​

(dec)​

0xc62a​50730​Image​ BaselineExposure​

SRational​Cameramodelsvaryinthe​

trade-off they make​

between highlight​

headroom and shadow​

noise. Some leave a​

significant amount of​

highlight headroom during​

a normal exposure. This​

allows significant negative​

exposure compensation to​

be applied during raw​

conversion,butalsomeans​

normal exposures will​

contain more shadow​

noise. Other models leave​

less headroom during​

normal exposures. This​

allows for less negative​

exposure compensation,​

butresultsinlowershadow​

noise for normal​

exposures. Because of​

these differences, a raw​

converterneedstovarythe​

zero point of its exposure​

compensationcontrolfrom​

model to model. Baseline​

Exposurespecifiesbyhow​

much(inEVunits)tomove​

the zero point. Positive​

values result in brighter​

default results, while​

negative values result in​

darker default results.​

0xc62b​50731​Image​ BaselineNoise​

Rational​Specifiestherelativenoise​

level of the camera model​

at a baseline ISO value of​