[Image-SIG] reading 16-bit images in the "raw"
Shemano David A Contr AFRL/SNJM
Thu, 19 Dec 2002 13:30:07 -0500
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
format = "MERLIN"
format_description = "Merlin camera raw little endian"
self.size = (320, 240)
self.mode = "F"
self.tile = [ ("raw", self.size, 0, ("F;16", 0, 1) ) ]
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 ?
File "c:\py22\pil\Image.py", line 528, in getextrema
File "c:\py22\pil\ImageFile.py", line 143, in load
TypeError: argument 2 must be sequence of length 4, not 2
any suggestions will be greatly appreciated. thanks in advance.