Posted By

johansonkatherine on 04/16/14

Tagged

Versions (?)

Last Edited at 04/16/14 09:14pm

Statistics

Viewed 1884 times

Favorited by 0 user(s)

Related snippets

Java code for Changing Color Space of PDF Document

/ Published in: Java

This code shows how java developers can change color space of PDF document from RGB color to CMYK and vice versa by using Aspose.PDF for Java Library. The following methods have been implemented in the Operator class for changing colors. Use it to change some specific RGB/CMYK colors to CMYK/RGB color space, keeping the remaining PDF document as it is.

â€¢ com.aspose.pdf.Operator.SetRGBColorStroke.getCMYKColor(new double[3], new double[4])
â€¢ com.aspose.pdf.Operator.SetRGBColor.getCMYKColor(new double[3], new double[4])
â€¢ com.aspose.pdf.Operator.SetCMYKColorStroke.getRGBColor(new double[4], new double[3])
â€¢ com.aspose.pdf.Operator.SetCMYKColor.getRGBColor(new double[4], new double[3])

Expand | Embed | Plain Text

Copy this code and paste it in your HTML

Document doc = new Document(myDir + "input_color.pdf");
OperatorCollection contents = doc.getPages().get_Item(1).getContents();
System.out.println("Values of RGB color operators in the pdf document");
for (int j = 1; j <= contents.size(); j++)
    {
	Operator oper = contents.get_Item(j);
	if (oper instanceof Operator.SetRGBColor || oper instanceof Operator.SetRGBColorStroke)
	try {
	    //Converting RGB to CMYK color
	    System.out.println(oper.toString());
 
	    double[] rgbFloatArray = new double[]
	        {
		    	Double.valueOf(oper.getParameters().get(0).toString()),
		    	Double.valueOf(oper.getParameters().get(1).toString()),
		    	Double.valueOf(oper.getParameters().get(2).toString()),
	        };
	    double[] cmyk = new double[4];
	    if (oper instanceof Operator.SetRGBColor)
	    {
		((Operator.SetRGBColor)oper).getCMYKColor(rgbFloatArray, cmyk);
		contents.set_Item(j, new Operator.SetCMYKColor(cmyk[0], cmyk[1], cmyk[2], cmyk[3]));
		}
		else if (oper instanceof Operator.SetRGBColorStroke)
		{
		    ((Operator.SetRGBColorStroke)oper).getCMYKColor(rgbFloatArray, cmyk);
		   contents.set_Item(j, new Operator.SetCMYKColorStroke(cmyk[0], cmyk[1], cmyk[2], cmyk[3]));
		}
		    else
throw new java.lang.Throwable("Unsupported command");
 
	} catch (Throwable e) {
	    e.printStackTrace();
	}
		        }
doc.save(myDir + "input_colorout.pdf");
 
//Testing the result
System.out.println("Values of converted CMYK color operators in the result pdf document");
doc = new Document(myDir + "input_colorout.pdf");
contents = doc.getPages().get_Item(1).getContents();
for (int j = 1; j <= contents.size(); j++)
    {
	Operator oper = contents.get_Item(j);
	if (oper instanceof Operator.SetCMYKColor || oper instanceof Operator.SetCMYKColorStroke)
	{
	   System.out.println(oper.toString());
	}
   }