Am 25.03.2015 um 22:52 schrieb Floris:
Hey there,
I am struggeling getting the PDDeviceN color space to work. I am
trying to create a simple page with one rectangle having a color
defined against a DeviceN space. I tried the following:
PDDeviceN cs =newPDDeviceN();
cs.setAlternateColorSpace(PDDeviceCMYK.INSTANCE);
cs.setColorantNames(Arrays.asList("Cyan","Magenta","Yellow","Black","Orange","Green"));
PDFunction func;
COSArray domains =newCOSArray();
COSArray ranges =newCOSArray();
domains.setFloatArray(new
float[]{0.0f,1.0f,0.0f,1.0f,0.0f,1.0f,0.0f,1.0f,0.0f,1.0f,0.0f,1.0f});
ranges.setFloatArray(new
float[]{0.0f,1.0f,0.0f,1.0f,0.0f,1.0f,0.0f,1.0f});
COSDictionary dict=newCOSDictionary();
dict.setItem(COSName.FUNCTION_TYPE, COSInteger.get(4));
dict.setItem(COSName.DOMAIN, domains);
dict.setItem(COSName.RANGE, ranges);
try{
func = PDFunction.create(tintdata);
cs.setTintTransform(func);
}catch(IOException e) {
e.printStackTrace();
}
This results in a NullPointerError in the first row of the try-part.
The type4-function should just pop the first two values (to get from
CMYKOG to CMYK). Could someone give me a jump start on how to define a
PDDeviceN space?
Have a nice day,
Floris
Hello,
- tintdata is not defined
- the postscript code of the type4 function is missing
Here's an excerpt of a PDF file with a type 4 function:
48 0 obj
<<
/FunctionType 4
/Domain [0 1]
/Range [0 1 0 1 0 1 0 1]
/Length 62
>>
stream
{dup 0.37 mul exch dup 0 mul exch dup 0.34 mul exch 0.34 mul }
endstream
endobj
i.e. your function must have a stream which contains the postscript
code. Thus call PDFunction.create() with a COStream. This object should
have the dictionary that you already have, and as stream the "code" of
the function.
COSDictionary dict=newCOSDictionary();
dict.setItem(COSName.FUNCTION_TYPE, COSInteger.get(4));
dict.setItem(COSName.DOMAIN, domains);
dict.setItem(COSName.RANGE, ranges);
String functionText = "{ push pop whatever }";
COSStream functionStream = new COSStream(dict, new RandomAccessBuffer());
OutputStream out = functionStream.createUnfilteredStream();
out.write(functionText.getBytes("US-ASCII"));
out.close();
func = PDFunction.create(functionStream);
I didn't test this code. If it doesn't work, please post some complete
code that creates a PDF (that fails) and I'll try to help you more
(However I can't help you with the postscript code).
Tilman
PS: always mention the version when you ask a question (in your case
probably 1.8.*)
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