Thanks again Frank,
That's actually very straightforward and works well.
Derek
Frank Warmerdam wrote:
I tried to import the CFloat32 directly into IDL/ENVI but it doesn't
like the '64-bit pixel'. Could there be a workaround by modifying
tiff tags to say the CFloat32 data are actually 2 separate 32-bit
numbers?
There is no mechanism to do this in TIFF, but you might find you can
export to a raw format and then alter the raw header to describe the
raw file differently.
The only raw format driver I can find that supports complex imagery is
the MFF2 (aka HKV) format.
If I translate a CInt16 dataset to MFF2 format (which creates a
directory)
I get an attrib file that looks like:
channel.enumeration = 1
channel.interleave = { *pixel tile sequential }
extent.cols = 2500
extent.rows = 14795
pixel.encoding = { unsigned *twos-complement ieee-754 }
pixel.size = 32
pixel.field = { real *complex }
pixel.order = { *lsbf msbf }
version = 1.1
If I change this to look like:
channel.enumeration = 2
channel.interleave = { *pixel tile sequential }
extent.cols = 2500
extent.rows = 14795
pixel.encoding = { unsigned *twos-complement ieee-754 }
pixel.size = 16
pixel.field = { *real complex }
pixel.order = { *lsbf msbf }
version = 1.1
The the dataset is essentially treated as two Int16 bands.
Note that channel.enumeration was changed to 2, pixel.size was
changed from 32 to 16, and pixel.field now has the star by real
instead of complex.
Best regards,
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