What does the 'F' mode mean in PIL?
Christopher Barker <[email protected]>
| Newsgroups | gmane.comp.python.image |
|---|---|
| Message-ID | <[email protected]> |
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.htm
With 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.
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