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how to set image from double values of pixels

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i am using PIL to get and set image data.Using image.getdata() i can
get a tuple of ints for each pixel. also i can use im.putdata(data)
to set pixels .

suppose i am given a double value as a pixel value (say 7245654.32456
which i may get from some image processing calc..) and thus i have an
array of doubles to represent the image.can i use im.putdata() to set
the pixel values without loss of information?

can someone help?
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