Just to close up this topic, I wasn't able to create 16-bit Tiffs from
PDL but I was able to print out the piddle into an ASCII file, and
then used another program (Arcmap) to transform that to a 16-bit
raster.
On Dec 12, 2007 2:38 PM, Christian Soeller <[EMAIL PROTECTED]> wrote:
> 24 bit RGB is really 3 separate 8-bit channels which does not help you.
> Whenever I need to preserve data with higher bit depth I use the netcdf
> interface (PDL::NetCDF) which is a CPAN module.
> Christian
>
>
>
> On 13/12/2007, at 8:41 AM, János Gonzales wrote:
>
> Hi Christian,
>
> Thanks so much for your response. Maybe I'm missing something here,
> but I don't understand how all the Pic code is in 8 bit, since on the
> PDL homepage they have an example where they transform a JPEG image of
> a space shuttle which is a 24 bit image. They use 'wim' to export and
> I thought that was a Pic subroutine. I don't necessarily have to
> output a TIFF, just any image format that will hold all of my values
> above 255. Do I have another option?
>
> Janos
>
>
>
>
> On Dec 12, 2007 12:14 PM, Christian Soeller <[EMAIL PROTECTED]>
> wrote:
> Hi Janos,
>
> The currently included Tiff IO code (and all other Pic code) is 8 bit only.
> A better interface would use libtiff for I/O but that is non-trivial due to
> the variety of TIFFs one encounters in the field.
>
> I once made a very simplistic 16bit TiFF reader for PDL. Somebody
> sufficiently knowledgeable could write a 16bit writer I suppose.
>
> Christian
>
>
>
>
>
> On 13/12/2007, at 6:34 AM, János Gonzales wrote:
>
> Hello,
> This is probably really easy, but I'm a newbie so I'm not sure how to
> do it. I'm trying to output a 16-bit Tiff, but all I get is an 8 bit
> tiff.
> Here's my pseudo code:
>
>
> use PDL;
> use PDL::NiceSlice;
> use PDL::IO::Pic;
>
> $blank_slate = zeroes(1800,900);
>
> .......in here i add values to the blank_slate piddle from 0 to about 3000
>
> $blank_slate->wpic("test.tif");
>
>
> So, if I look at test.tiff it's 1800x900 pixels, but the max value is
> 255 and not 3000. If it was a 16-bit tiff it could accomodate this
> value. I'm running this on Windows XP, and I have the netpbm binaries
> installed. (I noticed my wpic command calls pnmtotiff )
>
> Any ideas?
>
> Thanks much,
> Janos
>
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>
> --
> Christian Soeller PhD Dept. of Physiology +64 9 3737599 x82770
> University of Auckland Auckland, New Zealand fax +64 9 3737499
>
>
>
>
>
> --
> Christian Soeller PhD Dept. of Physiology +64 9 3737599 x82770
> University of Auckland Auckland, New Zealand fax +64 9 3737499
>
>
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