To rescale you could try using the point method on your image object.
On Jun 21, 2011, at 11:05 AM, Christopher Barker <chris.bar...@noaa.gov> wrote:
> Managan, Rob wrote:
>> If you are not worried about rounding errors; this command grabs the data,
>> and puts it back scaled by 255/65535 and no offset.
>> i.putdata(i.getdata(),255.0/np.iinfo(np.uint16).max,0.0)
>
> yup -- easy with numpy (I actually already did that), but I'm trying to
> figure out how to do it with PIL. Maybe there is no reason to, but is sure
> seems like it should be something PIL could easily do:
>
> Convert a unsigned int16 grayscale image to 24bit RGB.
>
> Thanks,
>
> -Chris
>
> By the way, your replies are not making it to the list -- you need to hit
> "reply all" or "reply to list".
>
>
>
>> On 6/20/11 1:17 PM, "Chris Barker" <chris.bar...@noaa.gov> wrote:
>>> On 6/17/2011 8:58 PM, Managan, Rob wrote:
>>>> While I am not an expert, it seems you have to use mode = 'F' in from
>>>> string.
>>>> Presumably then you can convert it to RGB?
>>>> All the floating point decoders (libImaging/Unpack.c) have mode 'F' so it
>>>> does not find a mode 'RGB' with the rawmode 'F;16'
>>>>
>>>> Hope this helps.
>>>>
>>> indeed it did -- I thought I'd triked that, but I guess I got confused
>>> about "mode" vs, "raw mode". So now I'm using mode: 'F', and raw mode
>>> 'F;16N'.
>>>
>>> It works without an error, but I'm still lost on how I can then convert
>>> the 'F' image to an RGB image. convert('RGB') seems to convert to grey
>>> (which I want), but doesn't scale t all -- so a value of 255 in the
>>> original uint16 data is white. How can I tell it to re-scalse?
>>>
>>> see attached code (requires numpy)
>>>
>>> -Chris
>>>
>
>
> --
> Christopher Barker, Ph.D.
> Oceanographer
>
> Emergency Response Division
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>
> chris.bar...@noaa.gov
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