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Topic: Postscript interpreter - PDF Function, DeviceN
Conf: (P-PDF) Developers, Msg: 137866
From: jbigonz
Date: 8/13/2005 03:27 AM

Hi Developers,

I would like to change embedded PS function in PDF file. It is used in DeviceN color space like tintTransform function.
Currently is used Type 4 function, I would like to replace this with Type 0.

I am new in poscript, so I am looking for solution how to evaluate the PS stream.
I wouldn't like to create a PS parser, is there any other solution?

Is there any simple solution to get the output values for discreet input values?
For example:
I would like to choose input values: (0, 0), (0, 0.3), (0, 0.6), ...(1, 1),
I am expecting output (0, 0, 0, 0), (0.2, 0.1, 0, 0), etc.

Please help!
Thanks in advance,

John

Here is the PDF object:
77 0 obj,/Length 142/Filter/FlateDecode/Range[0.0 1.0 0.0 1.0 0.0 1.0 0.0 1.0]/Domain[0.0 1.0 0.0 1.0]/FunctionType 4,stream
{1.000000 3 1 roll 1.000000 3 1 roll 1.000000 3 1 roll 1.000000 3 1
roll 6 -1 roll 2 index 0.690000 mul 1.000000 cvr exch sub mul 1 index
1.000000 mul 1.000000 cvr exch sub mul 1.000000 cvr exch sub 6 1 roll 5
-1 roll 2 index 0.070000 mul 1.000000 cvr exch sub mul 1 index 0.660000 mul
1.000000 cvr exch sub mul 1.000000 cvr exch sub 5 1 roll 4 -1 roll
2 index 0.000000 mul 1.000000 cvr exch sub mul 1 index 0.000000 mul 1.000000 cvr
exch sub mul 1.000000 cvr exch sub 4 1 roll 3 -1 roll 2 index
0.000000 mul 1.000000 cvr exch sub mul 1 index 0.020000 mul 1.000000 cvr exch sub
mul 1.000000 cvr exch sub 3 1 roll pop pop }
endstream

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