A followup, trying to do something real It seems that the raw decoder doesn't understand all the modes listed in:
http://www.pythonware.com/library/pil/handbook/decoder.htm indeed, hardly any of them ('F' only for the "floating point modes")Enclosed is some sample code I've got that attempts to convert a unsigned 16 bit grayscale image to RGB. I can't get it to do anything, as I get:
ValueError: unknown raw mode for any floating point mode other than 'F' What am I missing here? -Chirs Christopher Barker wrote:
Hi folks,I've been looking through the docs on File Decoders (or, in my case for decoding binary data with fromstring() or frombuffer()):http://www.pythonware.com/library/pil/handbook/decoder.htmWith the raw decoder, most of the modes are clear to me, but the 'F' mode has me confused:What is it really storing, working with? - one floating point value per pixel? - one floating point value per colorband? - but then, how are they arranged? - Is it single precision (32 bit) floats only?What does it mean if you use one of the modified 'F' modes, like "F;16N"? I know what an 16 bit native unsigned integer is, but I don't understand:- What happens if I do fromstring() with a mode f "F;16N" ? - is the data converted to a float (32bit)?- if so, do you just lose information if you have higher precision types being passed in?- is the raw data stored in 16 bit (two byte) chunks? - How is 'F' mode interpreted if you convert to, say 'RGB' mode? -grayscale? - something else? Any enlightenment would be great. -Chris
-- Christopher Barker, Ph.D. Oceanographer Emergency Response Division NOAA/NOS/OR&R (206) 526-6959 voice 7600 Sand Point Way NE (206) 526-6329 fax Seattle, WA 98115 (206) 526-6317 main reception [email protected]
PIL_u16.py
Description: application/python
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