I have the following python script that generates a 32 bit tiff file and then
reads that file back. I am checking what appears to be an error when I write
the file. I ran the same script on a OSX build and successfully read back in
the same data I wrote out, but when I run it on Ubuntu, the data is nowhere
near correct. I see no trend similar to the data I wrote. I am running with
version 4.0.3 of the tiff library. Would anyone know what accounts for this?
def test(path, resolution=1024, minValue=0.0, maxValue=1.0):
format = os.path.splitext(path)[1]
ramp = oiio.ImageOutput.create(path)
spec = oiio.ImageSpec()
spec.set_format( oiio.FLOAT )
spec.width = resolution
spec.height = 1
spec.nchannels = 3
ramp.open (path, spec, oiio.Create)
data = array.array("f", "\0" * spec.width * spec.height * spec.nchannels *
4)
for i in range(resolution):
value = float(i)/(resolution-1) * (maxValue - minValue) + minValue
print value
data[i*spec.nchannels +0] = value
data[i*spec.nchannels +1] = value
data[i*spec.nchannels +2] = value
#WRITE THE IMAGE OUT
ramp.write_image(spec.format, data)
ramp.close()
#READ THE IMAGE I JUST WROTE
ramp = oiio.ImageInput.open( path )
spec = ramp.spec()
type = spec.format.basetype
width = spec.width
height = spec.height
channels = spec.nchannels
type = oiio.FLOAT
data = ramp.read_image(type)
for value in data:
print value
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