images/image_mask
Place an image and apply a mask to it.
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<?php
/*
* 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, grayscale mask image file
*/
/* This is where the data files are. Adjust as necessary. */
$searchpath = dirname(__FILE__,3)."/input";
$outfile = "";
$title = "Image Mask";
$imagefile = "sky.jpg";
$maskfile = "image_mask.jpg";
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, "") == 0)
throw new Exception("Error: " . $p->get_errmsg());
$p->set_info("Creator", "PDFlib Cookbook");
$p->set_info("Title", $title);
/* Load the original image */
$image = $p->load_image("auto", $imagefile, "");
if ($image == 0)
throw new Exception("Error: " . $p->get_errmsg());
/*
* Load the grayscale image to be used as soft mask.
* It must not have an ICC profile, as an image with an ICCBased
* colorspace cannot be used as a mask.
*/
$mask = $p->load_image("auto", $maskfile, "honoriccprofile=false");
if ($mask == 0)
throw new Exception("Error: " . $p->get_errmsg());
/* Load the image with the mask assigned to it */
$masked_image = $p->load_image("auto", $imagefile, "masked " . $mask);
if ($masked_image == 0)
throw new Exception("Error: " . $p->get_errmsg());
/* Load font */
$font = $p->load_font("NotoSerif-Regular", "unicode", "");
if ($font == 0)
throw new Exception("Error: " . $p->get_errmsg());
/* Start a page with a size similar to the image dimensions. */
$p->begin_page_ext(0, 0, "width=a4.height height=a4.width");
/* 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=10");
/* Place the image without the clipping path applied to it */
$p->fit_image($mask, 300, 150, "boxsize {200 500} fitmethod=meet");
$p->fit_textline("Soft mask", 300, 130, "font=" . $font .
" fontsize=10");
/* Place the image with the clipping path applied to it */
$p->fit_image($masked_image, 550, 150, "boxsize {200 500} fitmethod=meet");
$p->fit_textline("Image with soft mask applied: darker mask", 550, 130,
"font=" . $font . " fontsize=10");
$p->fit_textline("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("");
$buf = $p->get_buffer();
$len = strlen($buf);
header("Content-type: application/pdf");
header("Content-Length: $len");
header("Content-Disposition: inline; filename=image_mask.pdf");
print $buf;
} catch (PDFlibException $e) {
echo("PDFlib exception occurred:\n".
"[" . $e->get_errnum() . "] " . $e->get_apiname() .
": " . $e->get_errmsg() . "\n");
exit(1);
} catch (Throwable $e) {
echo("PHP exception occurred: " . $e->getMessage() . "\n");
exit(1);
}
$p = 0;
?>