tiffBigMode

Enable or disable 'BigTIFF' mode for TIFF output.
[read/write property] tiffBigMode([out, retval] VARIANT_BOOL *big) tiffBigMode([in] VARIANT_BOOL big)
This property enables (if set to true) or disables (if set to false) use of BigTIFF mode when generating a TIFF file. BigTIFF is a standard TIFF extension that uses 64-bit offsets, allowing TIFF files larger than 4GB.

The resetParams function resets BigTIFF to the default value of false (disabled).

VB:
pdf.tiffBigMode = true
resetParams
writePageBitmap
writeRegionBitmap