I just responded to your original thread. With my PDL install, I am able to
use wpic() to *create* 16-bit TIFF and 16-bit PNG files (if the image was
converted to ushort before the wpic() call). The rpic() part is what
fails for
16-bit images but the wpic() could use better control over the output pixel
depths.
János Gonzales wrote:
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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