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Convert PDF to image (JPG, PNG, BMP, TIFF) in PHP

Sample PHP code to use PDFTron SDK's built-in rasterizer to render PDF images on the fly and save the resulting images in various raster image formats (such as PNG, JPEG, BMP, TIFF). Learn more about our PDF Conversion Library.

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<?php
//---------------------------------------------------------------------------------------
// Copyright (c) 2001-2019 by PDFTron Systems Inc. All Rights Reserved.
// Consult LICENSE.txt regarding license information.
//---------------------------------------------------------------------------------------
include("../../../PDFNetC/Lib/PDFNetPHP.php");

// Relative path to the folder containing the test files.
$input_path = getcwd()."/../../TestFiles/";
$output_path = $input_path."Output/";

//---------------------------------------------------------------------------------------
// The following sample illustrates how to convert PDF documents to various raster image 
// formats (such as PNG, JPEG, BMP, TIFF, etc), as well as how to convert a PDF page to 
// GDI+ Bitmap for further manipulation and/or display in WinForms applications.
//---------------------------------------------------------------------------------------
	
	// The first step in every application using PDFNet is to initialize the 
	// library and set the path to common PDF resources. The library is usually 
	// initialized only once, but calling Initialize() multiple times is also fine.
	PDFNet::Initialize();

	// Optional: Set ICC color profiles to fine tune color conversion 
	// for PDF 'device' color spaces...

	// PDFNet::SetResourcesPath("../../../resources");
	// PDFNet::SetColorManagement();
	// PDFNet::SetDefaultDeviceCMYKProfile("D:/Misc/ICC/USWebCoatedSWOP.icc");
	// PDFNet::SetDefaultDeviceRGBProfile("AdobeRGB1998.icc"); // will search in PDFNet resource folder.

	// ----------------------------------------------------
	// Optional: Set predefined font mappings to override default font 
	// substitution for documents with missing fonts...

	// PDFNet::AddFontSubst("StoneSans-Semibold", "C:/WINDOWS/Fonts/comic.ttf");
	// PDFNet::AddFontSubst("StoneSans", "comic.ttf");  // search for 'comic.ttf' in PDFNet resource folder.
	// PDFNet::AddFontSubst(PDFNet::e_Identity, "C:/WINDOWS/Fonts/arialuni.ttf");
	// PDFNet::AddFontSubst(PDFNet::e_Japan1, "C:/Program Files/Adobe/Acrobat 7.0/Resource/CIDFont/KozMinProVI-Regular.otf");
	// PDFNet::AddFontSubst(PDFNet::e_Japan2, "c:/myfonts/KozMinProVI-Regular.otf");
	// PDFNet::AddFontSubst(PDFNet::e_Korea1, "AdobeMyungjoStd-Medium.otf");
	// PDFNet::AddFontSubst(PDFNet::e_CNS1, "AdobeSongStd-Light.otf");
	// PDFNet::AddFontSubst(PDFNet::e_GB1, "AdobeMingStd-Light.otf");
	
	$draw = new PDFDraw();

	//--------------------------------------------------------------------------------
	// Example 1) Convert the first page to PNG and TIFF at 92 DPI. 
	// A three step tutorial to convert PDF page to an image.
	 
	// A) Open the PDF document.
	$doc = new PDFDoc($input_path."tiger.pdf");

	// Initialize the security handler, in case the PDF is encrypted.
	$doc->InitSecurityHandler();  

	// B) The output resolution is set to 92 DPI.
	$draw->SetDPI(92);

	// C) Rasterize the first page in the document and save the result as PNG.
	$draw->Export($doc->GetPageIterator()->Current(), $output_path."tiger_92dpi.png");

	echo nl2br("Example 1: tiger_92dpi.png\n");

	// Export the same page as TIFF
	$draw->Export($doc->GetPageIterator()->Current(), $output_path."tiger_92dpi.tif", "TIFF");

	//--------------------------------------------------------------------------------
	// Example 2) Convert the all pages in a given document to JPEG at 72 DPI.
	echo nl2br("Example 2:\n");
	$hint_set = new ObjSet(); //  A collection of rendering 'hits'.
	 
	$doc = new PDFDoc($input_path."newsletter.pdf");
	// Initialize the security handler, in case the PDF is encrypted.
	$doc->InitSecurityHandler();  

	$draw->SetDPI(72); // Set the output resolution is to 72 DPI.

	// Use optional encoder parameter to specify JPEG quality.
	$encoder_param=$hint_set->CreateDict();
	$encoder_param->PutNumber("Quality", 80);

	// Traverse all pages in the document.
	for ($itr=$doc->GetPageIterator(); $itr->HasNext(); $itr->Next()) {
		$filename = $output_path."newsletter".$itr->Current()->GetIndex().".jpg";
		echo nl2br($filename."\n");
		$draw->Export($itr->Current(), $filename, "JPEG", $encoder_param);
	}

	echo nl2br("Done.\n");

	// Examples 3-5
				
	// Common code for remaining samples.
	$tiger_doc = new PDFDoc($input_path."tiger.pdf");
	// Initialize the security handler, in case the PDF is encrypted.
	$tiger_doc->InitSecurityHandler();  
	$page = $tiger_doc->GetPage(1);

	//--------------------------------------------------------------------------------
	// Example 3) Convert the first page to raw bitmap. Also, rotate the 
	// page 90 degrees and save the result as RAW.
	$draw->SetDPI(100); // Set the output resolution is to 100 DPI.
	$draw->SetRotate(Page::e_90);  // Rotate all pages 90 degrees clockwise.

	$bmp = $draw->GetBitmap($page, PDFDraw::e_rgb);

	// Save the raw RGB data to disk.
	file_put_contents($output_path."tiger_100dpi_rot90.raw", $bmp->GetBuffer());

	echo nl2br("Example 3: tiger_100dpi_rot90.raw\n");
	$draw->SetRotate(Page::e_0);  // Disable image rotation for remaining samples.

	//--------------------------------------------------------------------------------
	// Example 4) Convert PDF page to a fixed image size. Also illustrates some 
	// other features in PDFDraw class such as rotation, image stretching, exporting 
	// to grayscale, or monochrome.

	// Initialize render 'gray_hint' parameter, that is used to control the 
	// rendering process. In this case we tell the rasterizer to export the image as 
	// 1 Bit Per Component (BPC) image.
	$mono_hint=$hint_set->CreateDict();  
	$mono_hint->PutNumber("BPC", 1);

	// SetImageSize can be used instead of SetDPI() to adjust page  scaling 
	// dynamically so that given image fits into a buffer of given dimensions.
	$draw->SetImageSize(1000, 1000);		// Set the output image to be 1000 wide and 1000 pixels tall
	$draw->Export($page, $output_path."tiger_1000x1000.png", "PNG", $mono_hint);
	echo nl2br("Example 4: tiger_1000x1000.png\n");

	$draw->SetImageSize(200, 400);	    // Set the output image to be 200 wide and 300 pixels tall
	$draw->SetRotate(Page::e_180);  // Rotate all pages 90 degrees clockwise.

	// 'gray_hint' tells the rasterizer to export the image as grayscale.
	$gray_hint=$hint_set->CreateDict();  
	$gray_hint->PutName("ColorSpace", "Gray");

	$draw->Export($page, $output_path."tiger_200x400_rot180.png", "PNG", $gray_hint);
	echo nl2br("Example 4: tiger_200x400_rot180.png\n");

	$draw->SetImageSize(400, 200, false);  // The third parameter sets 'preserve-aspect-ratio' to false.
	$draw->SetRotate(Page::e_0);    // Disable image rotation.
	$draw->Export($page, $output_path."tiger_400x200_stretch.jpg", "JPEG");
	echo nl2br("Example 4: tiger_400x200_stretch.jpg\n");

	//--------------------------------------------------------------------------------
	// Example 5) Zoom into a specific region of the page and rasterize the 
	// area at 200 DPI and as a thumbnail (i.e. a 50x50 pixel image).
	$zoom_rect = new Rect(216.0, 522.0, 330.0, 600.0);
	$page->SetCropBox($zoom_rect);	// Set the page crop box.

	// Select the crop region to be used for drawing.
	$draw->SetPageBox(Page::e_crop); 
	$draw->SetDPI(900);  // Set the output image resolution to 900 DPI.
	$draw->Export($page, $output_path."tiger_zoom_900dpi.png", "PNG");
	echo nl2br("Example 5: tiger_zoom_900dpi.png\n");


	// -------------------------------------------------------------------------------
	// Example 6)
	$draw->SetImageSize(50, 50);	   // Set the thumbnail to be 50x50 pixel image.
	$draw->Export($page, $output_path."tiger_zoom_50x50.png", "PNG");
	echo nl2br("Example 6: tiger_zoom_50x50.png\n");

	$cmyk_hint = $hint_set->CreateDict();
	$cmyk_hint->PutName("ColorSpace", "CMYK");
	
	//--------------------------------------------------------------------------------
	// Example 7) Convert the first PDF page to CMYK TIFF at 92 DPI.
	// A three step tutorial to convert PDF page to an image
	// A) Open the PDF document.
	$doc = new PDFDoc($input_path."tiger.pdf");
	// Initialize the security handler, in case the PDF is encrypted.
	$doc->InitSecurityHandler();  

	// B) The output resolution is set to 92 DPI.
	$draw->SetDPI(92);

	// C) Rasterize the first page in the document and save the result as TIFF.
	$pg = $doc->GetPage(1);
	$draw->Export($pg, $output_path."out1.tif", "TIFF", $cmyk_hint);
	echo nl2br("Example 7: out1.tif\n");

	$doc->Close();

	//--------------------------------------------------------------------------------
	// Example 8) PDFRasterizer can be used for more complex rendering tasks, such as 
	// strip by strip or tiled document rendering. In particular, it is useful for 
	// cases where you cannot simply modify the page crop box (interactive viewing,
	// parallel rendering).  This example shows how you can rasterize the south-west
	// quadrant of a page.
	// A) Open the PDF document.
	$doc = new PDFDoc($input_path."tiger.pdf");
	// Initialize the security handler, in case the PDF is encrypted.
	$doc->InitSecurityHandler();  

	// B) Get the page matrix 
	$pg = $doc->GetPage(1);
	$box = Page::e_crop;
	$mtx = $pg->GetDefaultMatrix(true, $box);
	// We want to render a quadrant, so use half of width and height
	$pg_w = $pg->GetPageWidth($box) / 2;
	$pg_h = $pg->GetPageHeight($box) / 2;

	// C) Scale matrix from PDF space to buffer space
	$dpi = 96.0;
	$scale = $dpi / 72.0; // PDF space is 72 dpi
	$buf_w = (int)($scale * $pg_w);
	$buf_h = (int)($scale * $pg_h);
	$bytes_per_pixel = 4; // BGRA buffer
	$buf_size = $buf_w * $buf_h * $bytes_per_pixel;
	$mtx->Translate(0, -$pg_h); // translate by '-pg_h' since we want south-west quadrant
	$mtx = new Matrix2D($scale, 0.0, 0.0, $scale, 0.0, 0.0); 
	$mtx->Multiply($mtx);

	// D) Rasterize page into memory buffer, according to our parameters
	$rast = new PDFRasterizer();
	$buf = $rast->Rasterize($pg, $buf_w, $buf_h, $buf_w * $bytes_per_pixel, $bytes_per_pixel, true, $mtx);

	// buf now contains raw BGRA bitmap.
	echo nl2br("Example 8: Successfully rasterized into memory buffer.\n");

	//--------------------------------------------------------------------------------
	// Example 9) Export raster content to PNG using different image smoothing settings. 
	$text_doc = new PDFDoc($input_path."lorem_ipsum.pdf");
	$text_doc->InitSecurityHandler();

	$draw->SetImageSmoothing(false, false);
	$filename = "raster_text_no_smoothing.png";
	$draw->Export($text_doc->GetPageIterator()->Current(), $output_path.$filename);
	echo nl2br("Example 9 a): ".$filename.". Done.\n");

	$filename = "raster_text_smoothed.png";
	$draw->SetImageSmoothing(true, false /*default quality bilinear resampling*/);
	$draw->Export($text_doc->GetPageIterator()->Current(), $output_path.$filename);
	echo nl2br("Example 9 b): ".$filename.". Done.\n");

	$filename = "raster_text_high_quality.png";
	$draw->SetImageSmoothing(true, true /*high quality area resampling*/);
	$draw->Export($text_doc->GetPageIterator()->Current(), $output_path.$filename);
	echo nl2br("Example 9 c): ".$filename.". Done.\n");

	//--------------------------------------------------------------------------------
	// Example 10) Export separations directly, without conversion to an output colorspace
	$separation_doc = new PDFDoc($input_path."op_blend_test.pdf");
	$separation_doc->InitSecurityHandler();
	$separation_hint = $hint_set->CreateDict();
	$separation_hint->PutName("ColorSpace", "Separation");
	$draw->SetDPI(96);
	$draw->SetImageSmoothing(true, true);
	$draw->SetOverprint(PDFRasterizer::e_op_on);

	$filename = "merged_separations.png";
	$draw->Export($separation_doc->GetPageIterator()->Current(), $output_path.$filename, "PNG");
	echo nl2br("Example 10 a): ".$filename.". Done.\n");

	$filename = "separation";
	$draw->Export($separation_doc->GetPageIterator()->Current(), $output_path.$filename, "PNG", $separation_hint);
	echo nl2br("Example 10 b): ".$filename."_[ink].png. Done.\n");

	$filename = "separation_NChannel.tif";
	$draw->Export($separation_doc->GetPageIterator()->Current(), $output_path.$filename, "TIFF", $separation_hint);
	echo nl2br("Example 10 c): ".$filename.". Done.\n");

?>
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