Re: [Lcms-user] ctypes Python bindings

[Guy K. K. <G....@ma...>]

On Wed, 15 Oct 2008 7:31:49 pm Frédéric wrote:
> Can you show an example for a in-place transform?

Yes, of course. I have just renamed the OO module to "littlecms" as I figured 
there may be some possible clashes on Wintendo using just case as a 
difference for files. This way it may better co-exist with the "classic" LCMS 
SWIG bindings, too.

Note that naming of the parameter (destinationBuffer) in the doTransform() 
call can also be omitted, as destination buffer is the second call parameter. 
I just slipped it in for the example as it makes it clearer what happens. The 
code sample below converts 8 bit device RGB to 8 bit sRGB:

#!/usr/bin/env python
import numpy
import littlecms

# Read an input profile from the file system.
myProfile = littlecms.Profile('testdata/target.icc')

# Create an LCMS default profile for Lab.
srgbProfile = littlecms.Profile(colourSpace=littlecms.PT_RGB)

# Create a transformation object for
# device RGB (8 bit) -> Lab (double) conversion,
# rendering intent INTENT_PERCEPTUAL.
myTransform = littlecms.Transform(myProfile, srgbProfile)

rgbColours = numpy.array([[159, 189, 63],
                          [230, 162, 39]],
                         dtype=numpy.uint8)

print 'device RGB colours:\n', rgbColours

# Transform just one colour tuple
myTransform.doTransform(rgbColours, destinationBuffer=rgbColours)

print 'sRGB colours:\n', rgbColours


Guy

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Guy K. Kloss
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