images/image_mask
* Image mask:
* Place an image with a mask applied to it
*
* Place an image and apply a Grayscale mask on it. Depending on the values
* contained in the mask, the image pixels will be displayed more or less
* transparent. Smaller (darker) mask values result in more transparent image
* pixels and larger (lighter) values in less transparency.
*
* Required software: PDFlib/PDFlib+PDI/PPS 9
* Required data: image file
*/
package com.pdflib.cookbook.pdflib.images;
import com.pdflib.pdflib;
import com.pdflib.PDFlibException;
public class image_mask
{
public static void main (String argv[])
{
/* This is where the data files are. Adjust as necessary. */
String searchpath = "../input";
String outfile = "image_mask.pdf";
String title = "Image Mask";
pdflib p = null;
String imagefile = "sky.jpg";
String maskfile = "image_mask.jpg";
int font, image, mask, masked_image;
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: 1.8 $");
/* Load the original image */
image = p.load_image("auto", imagefile, "");
if (image == -1)
throw new Exception("Error: " + p.get_errmsg());
/* Load the Grayscale image to be used as the transparency mask */
mask = p.load_image("auto", maskfile, "mask");
if (mask == -1)
throw new Exception("Error: " + p.get_errmsg());
/* Load the image with the transparency mask being assigned to it */
masked_image = p.load_image("auto", imagefile, "masked " + mask);
if (masked_image == -1)
throw new Exception("Error: " + p.get_errmsg());
/* Load font */
font = p.load_font("Helvetica", "unicode", "");
if (font == -1)
throw new Exception("Error: " + p.get_errmsg());
/* Start a page with a size similar to the image dimensions.
* The "transparencygroup" option improves output quality when placing
* the image on a page which contains transparent objects (image or
* other).
* PDFlib 7.0.3 will automatically create the "transparencygroup"
* option, so it is only required in earlier versions.
*/
p.begin_page_ext(0, 0, "width=a4.height height=a4.width " +
"transparencygroup={CS=DeviceRGB}");
/* Place the original image */
p.fit_image(image, 50, 150, "boxsize {200 500} fitmethod=meet");
p.fit_textline("Original image", 50, 130, "font=" + font +
" fontsize=14");
/* Place the image without the clipping path being applied to it */
p.fit_image(mask, 300, 150, "boxsize {200 500} fitmethod=meet");
p.fit_textline("Transparency mask", 300, 130, "font=" + font +
" fontsize=14");
/* Place the image with the clipping path being applied to it */
p.fit_image(masked_image, 550, 150, "boxsize {200 500} fitmethod=meet");
p.fit_textline("Image with the transparency mask applied.", 550, 130,
"font=" + font + " fontsize=10");
p.fit_textline("Darker mask values result in more transparent image " +
"values.", 550, 110, "font=" + font + " fontsize=10");
/* Close the images */
p.close_image(image);
p.close_image(mask);
p.close_image(masked_image);
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.getMessage());
} finally {
if (p != null) {
p.delete();
}
}
}
}