[Image-SIG] reading 16-bit images in the "raw"
K Schutte
schutte@fel.tno.nl
Fri, 20 Dec 2002 08:41:03 +0100
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Hi,
>From recent work reading 16 bit TIFF images (now in the PIL 1.1.4 alpha 2
release,
see attached message), I think that you should set self.mode to "I;16", and
also use the same mode specifier in the last line.
Using "I;16" denotes that it is a 16 bit unsigned integer. "F;16" should specify
16 bit float format, and my system only supports float of length 32 and 64
bits...
Good luck,
Klamer
Shemano David A Contr AFRL/SNJM wrote:
>
> hi,
> i am having difficulty with writing my own file decoder. the images are 16-bits per pixel straight binary with no header. i wrote a decoder following the example in the pil documentation, but it seems not to work. the images are 320x240 16-bits per pixel. the image file has the right number of bytes. here is my decoder:
>
> import Image, ImageFile
>
> class MerlinImageFile(ImageFile.ImageFile):
>
> format = "MERLIN"
> format_description = "Merlin camera raw little endian"
>
> def _open(self):
>
> self.size = (320, 240)
> self.mode = "F"
>
> self.tile = [ ("raw", self.size, 0, ("F;16", 0, 1) ) ]
>
> Image.register_open("MERLIN", MerlinImageFile)
> Image.register_extension("MERLIN", ".mln")
>
> in the tile attribute the "F;16" is intended to mean that 2 bytes get read in, they are interpreted as a 16-bit little endian integer and the value of that integer is stored as a floating point value in my image. (please set me straight if i have misinterpreted that)
>
> here is an idle session where i attempt to use the above:
>
> >>> import Image
> >>> import MerlinImageFile
> >>> im = Image.open("c:\\python22\\dave_projects\\test.mln")
> >>> print im.getextrema()
> Traceback (most recent call last):
> File "<pyshell#4>", line 1, in ?
> print im.getextrema()
> File "c:\py22\pil\Image.py", line 528, in getextrema
> self.load()
> File "c:\py22\pil\ImageFile.py", line 143, in load
> d.setimage(self.im, e)
> TypeError: argument 2 must be sequence of length 4, not 2
> >>>
>
> any suggestions will be greatly appreciated. thanks in advance.
>
> dave shemano
>
> _______________________________________________
> Image-SIG maillist - Image-SIG@python.org
> http://mail.python.org/mailman/listinfo/image-sig
--
Klamer Schutte, E-mail: Schutte@fel.tno.nl
Electro-Optical Systems, TNO Physics and Electronics Laboratory
Tel: +31-70-3740469 -- Fax: +31-70-3740654 -- Mobile: +31-6-51316671
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Subject: [Image-SIG] ANN: PIL 1.1.4 alpha 2
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Date: Sun, 24 Nov 2002 11:40:22 +0100
A PIL 1.1.4 alpha 2 tarball is now available from effbot.org:
http://effbot.org/downloads
(look for Imaging-1.1.4a2.tar.gz)
A list of changes can be found here:
http://effbot.org/zone/pil-changes-114.htm
...and a draft handbook can be found here:
http://effbot.org/books/imagingbook/
The final release will be released by Secret Labs AB, as usual.
We expect to release the final 1.1.4 version before the end of
the year.
Report bugs to this list or directly to me, as usual.
enjoy /F
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