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Private TIFF Tag DefaultScale

TIFF Tag DefaultScale

IFDImage
Code50718 (hex 0xC61E)
NameDefaultScale
LibTiff nameTIFFTAG_DEFAULTSCALE
TypeRATIONAL
Count2
Default1.0, 1.0

Description

Used in Raw IFD of DNG files.

DefaultScale is required for cameras with non-square pixels. It specifies the default scale factors for each direction to convert the image to square pixels. 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 values should usually differ by a factor of 2.0.

Value 0 is DefaultScaleH
Value 1 is DefaultScaleV

Related tags

CFALayout
BestQualityScale

See also

DNG Specification