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color/overprint

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/* $Id: overprint.java,v 1.4 2017/01/25 14:45:50 stm Exp $

 *

 * Overprint colors:

 * - demonstrate the difference between CMYK output with/without overprinting

 * - blendmode=darken as device-independent alternative to overprinting

 * - DeviceN is never affected by overprint settings

 *

 * Required software: PDFlib/PDFlib+PDI/PPS 9.1

 * Required data: none

 */

package com.pdflib.cookbook.pdflib.color;


import com.pdflib.pdflib;

import com.pdflib.PDFlibException;


public class overprint

{

    public static void main (String argv[])

    {

    /* This is where the data files are. Adjust as necessary. */

    String searchpath = "../input";

    String outfile = "overprint.pdf";

    String title = "Overprint colors";


    pdflib p = null;

    int font, gstate, devicen;

    int x=50, y=700, width=150, height=75, fontsize=9;

    String optlist;


    try {

        p = new pdflib();


        p.set_option("searchpath={" + searchpath + "}");


        /* This means we must check return values of load_font() etc. */

        p.set_option("errorpolicy=return");


        if (p.begin_document(outfile, "") == -1)

            throw new Exception("Error: " + p.get_errmsg());


        p.set_info("Creator", "PDFlib Cookbook");

        p.set_info("Title", title + " $Revision: 1.4 $");


        /* The transparency group colorspace is important for Overprint

         * Preview on the screen.

         */

        p.begin_page_ext(595, 842, "transparencygroup={colorspace=devicecmyk}");


        font = p.load_font("LinLibertine_R", "unicode", "embedding");


        if (font == -1)

            throw new Exception("Error: " + p.get_errmsg());


        p.setfont(font, 11);


        /* ********************************************************

         * Yellow and Cyan in CMYK color space without overprinting

         */

        p.set_graphics_option("fillcolor={cmyk 1 0 0 0}");

        p.rect(x, y, width, height);

        p.fill();


        optlist = "overprintfill=false";

        gstate = p.create_gstate(optlist);

        p.save();

        p.set_gstate(gstate);

        p.set_graphics_option("fillcolor={cmyk 0 0 1 0}");

        p.rect(x+width/2, y+height/2, width, height);

        p.fill();

        p.restore();

        p.fit_textline("CMYK colors without overprinting: " + optlist,

                        x, y-2*fontsize, "fillcolor=black");


       

        /* ********************************************************

         * Overprint Yellow and Cyan in CMYK color space: this is

         * device-dependent; it requires "Overprint Preview" enabled in

         * Acrobat.

         */

        y -= 2*height;

        p.set_graphics_option("fillcolor={cmyk 1 0 0 0}");

        p.rect(x, y, width, height);

        p.fill();


        optlist = "overprintfill=true overprintmode=1";

        gstate = p.create_gstate(optlist);

        p.save();

        p.set_gstate(gstate);

        p.set_graphics_option("fillcolor={cmyk 0 0 1 0}");

        p.rect(x+width/2, y+height/2, width, height);

        p.fill();

        p.restore();

        p.fit_textline("Device-dependent overprinting: " + optlist,

                        x, y-2*fontsize, "fillcolor=black");



        /* ********************************************************

         * Achieve device-independent overprinting effect with Yellow and

         * Cyan in CMYK color space with blend mode "Darken".

         */

        y -= 2*height;

        p.set_graphics_option("fillcolor={cmyk 1 0 0 0}");

        p.rect(x, y, width, height);

        p.fill();


        optlist = "blendmode=darken";

        gstate = p.create_gstate(optlist);

        p.save();

        p.set_gstate(gstate);

        p.set_graphics_option("fillcolor={cmyk 0 0 1 0}");

        p.rect(x+width/2, y+height/2, width, height);

        p.fill();

        p.restore();

        p.fit_textline("Device-independent overprinting effect with blend mode: " + optlist,

                        x, y-2*fontsize, "fillcolor=black");



        /* ********************************************************

         * Overprint Yellow and Cyan in DeviceN color space: overprint

         * settings don't have any effect.

         */

        y -= 2*height;

            devicen = p.create_devicen(

                        "names={Cyan Yellow} alternate=devicecmyk transform={{0 0 3 1 roll}} errorpolicy=exception");


        p.set_graphics_option("fillcolor={devicen " + devicen + " 1 0}");

        p.rect(x, y, width, height);

        p.fill();


        gstate = p.create_gstate("overprintfill=true overprintmode=1");

        p.save();

        p.set_gstate(gstate);

        p.set_graphics_option("fillcolor={devicen " + devicen + " 0 1}");

        p.rect(x+width/2, y+height/2, width, height);

        p.fill();

        p.restore();

        p.fit_textline("DeviceN colors (Cyan+Yellow): always unaffected by overprint settings",

                        x, y-2*fontsize, "fillcolor=black");


        p.end_page_ext("");


        p.end_document("");


        } catch (PDFlibException e){

            System.err.print("PDFlib exception occurred:\n");

            System.err.print("[" + e.get_errnum() + "] " + e.get_apiname() +

                ": " + e.get_errmsg() + "\n");

        } catch (Exception e) {

            System.err.println(e.toString());

        } finally {

            if (p != null) {

                p.delete();

            }

        }

    }

}