|Private TIFF Tag DefaultScale|
TIFF Tag Reference
TIFF Tag DefaultScale
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