I have the following php function below that's converting a local PDF file into images. In short, I want each PDF page to be converted to a separate image.
The function converts the PDF to an image - but only the last page. I want every page of the PDF to be converted to a image and numbered. Not just the last page of the PDF.
Currently, this function converts the last page of example.pdf
to example-0.jpg
. Issue I'm sure lies within the for
method. What am I missing?
$file_name = 'example.pdf'; // using just for this example, I pull $file_name from another function
function _create_preview_images($file_name) {
// Strip document extension
$file_name = basename($file_name, '.pdf');
// Convert this document
// Each page to single image
$img = new imagick('uploads/'.$file_name.'.pdf');
// Set background color and flatten
// Prevents black background on objects with transparency
$img->setImageBackgroundColor('white');
$img = $img->flattenImages();
// Set image resolution
// Determine num of pages
$img->setResolution(300,300);
$num_pages = $img->getNumberImages();
// Compress Image Quality
$img->setImageCompressionQuality(100);
// Convert PDF pages to images
for($i = 0;$i < $num_pages; $i++) {
// Set iterator postion
$img->setIteratorIndex($i);
// Set image format
$img->setImageFormat('jpeg');
// Write Images to temp 'upload' folder
$img->writeImage('uploads/'.$file_name.'-'.$i.'.jpg');
}
$img->destroy();
}
Seems like most of my code was correct. The issue was, I was using $img->flattenImages();
incorrectly. This merges
a sequence of images into one image. Much like how Photoshop flattens all visible layers into an image when exporting a jpg
.
I removed the above line and the individual files were written as expected.