Image to PDF with pre-defined resolution
This demo converts an image to a PDF document in a pre-defined resolution.
You will not see the difference in the reader application because the pixel density isn't changed in any way. The difference can be seen in the page properties - at the end it is the page size that changes relatively to the given resolution (that bigger the resolution, that smaler the page size will be).
PHP
<?php // load and register the autoload function require_once '../../../../../bootstrap.php'; // prepare some files $files = []; foreach (glob($assetsDirectory . '/images/*/*.{png,jpg,jpeg,gif}', GLOB_BRACE) as $file) { foreach ([72, 96, 150, 300] as $dpi) { $files[] = [ 'path' => $file, 'displayValue' => basename($file) . ' (' . $dpi . 'dpi)', 'dpi' => $dpi ]; } } $imgData = displayFiles($files, true); // create a writer $writer = new \SetaPDF_Core_Writer_Http('ImgInSpecificResolution.pdf', true); // create a document $document = new \SetaPDF_Core_Document($writer); $img = \SetaPDF_Core_Image::getByPath($imgData['path']); $xObject = $img->toXObject($document); $width = $xObject->getWidth(); $height = $xObject->getHeight(); // calculate the width by the given DPI value $dpi = $imgData['dpi']; $width = $width * 72 / $dpi; $height = $height * 72 / $dpi; $pages = $document->getCatalog()->getPages(); $page = $pages->create( [$width, $height], \SetaPDF_Core_PageFormats::ORIENTATION_AUTO ); $canvas = $page->getCanvas(); $xObject->draw($canvas, 0, 0, $width, $height); $document->save()->finish();