Hi I've written the code for the parameter, but I cannot find such test data file.What would I do?
2008/12/27 <[email protected]> > > Hi Yang. > > This patch should be OK for DCT decode filter.... > > As you can see in the 7.4.8 section of the ISO PDF specification the > DCT decoder uses one parameter: > > ColorTransform (integer, optional) > > A code specifying the transformation that shall be performed > on the sample values: > > 0 - no transformation > 1 - If the image has three colour components, RGB values shall > be transformed to YUV before encoding and from YUV to RGB > after decoding. If the image has four components, CMYK values > shall be transformed to YUVK before encoding and from YUVK to > CMYK after decoding. This option shall be ignored if the image > has one or two colour components. > > If the encoding algorithm has inserted the Adobe-defined > marker code in the encoded data indicating the ColorTransform > value, then the colours shall be transformed, or not, after > the DCT decoding has been performed according to the value > provided in the encoded data and the value of this dictionary > entry shall be ignored. If the Adobe-defined marker code in > the encoded data indicating the ColorTransform value is not > present then the value specified in this dictionary entry will > be used. If the Adobe-defined marker code in the encoded data > indicating the ColorTransform value is not present and this > dictionary entry is not present in the filter dictionary then > the default values of ColorTranform shall be 1 if the image > has three components and 0 otherwise. > > Your implementation does not seem to be aware of the parameter. > >
