For developers and businesses needing to convert PDFs into high-quality images, you may have realized it can get complicated pretty quickly, and many things can go wrong during conversion, leaving you with a less than desired output file. So we put together this guide with everything you should know when converting PDFs to images, including how to use our products and sample code to do so.    

Know Your Image Types First    

Before you convert PDF to image, it’s important to understand your image file type, especially if you’re converting the file for a client/customer. That’s because choosing an image file type that does not align with your recipient’s expectations means: 

• The file being shared/processed may not be consumable 
• Recipients cannot complete their actions 
• The content quality is reduced to irrelevance 
• Rework is likely required     

BMP    

BMP stands for Bitmap Image or Bitmap File Format. It is a standard image file format that stores digital images, particularly in a raster graphics format. BMP files are known for their simplicity and support for uncompressed image data, meaning that they can be quite large compared to other image formats that use compression. BMP files are ideal for use in graphic design, digital art, medical imaging, and image archiving.    

PNG    

PNG (Portable Network Graphics) files are ideal for images with high contrast (such as photos, line art, detailed diagrams, and other images with high gradients) and for images that include transparency. PNG files use lossless compression and support a number of transparency options (including alpha channel transparency) and grayscale, RGB, RGBA, and palette-based color (either 24-bit RGB or 32-bit RGBA).      

GIF      

GIF is an acronym for Graphics Interchange Format, a file format that supports both static and animated images. GIFs rose to popularity as a way to react on social media without words. There have often been arguments about its proper pronunciation as well (is it gif or jif? We may never know). GIF files are ideal for images that require animation and simple graphics (logos and line drawings) because of their limited color palette support. When subtle colors matter, GIF is not likely ideal. The file type supports up to 8 bits (up to 256 distinct RGB colors) per pixel.    

JPEG      

JPEG (Joint Photographic Experts Group) files are ideal for photo quality images that have subtle shifts in color (and ideally do not have sharp contrast, like individual screenshots of media) that must be maintained; JPEG files allow recipients to fine-tune lossy compression to effectively balance image quality and size (in bytes).    

TIF      

A TIF or TIFF file, which stands for Tagged Image File Format, is a widely-used file format for storing raster graphics images. TIFF is known for its flexibility and versatility, supporting various color depths, resolutions, and compression options. It supports layers and transparency, making it sufficient to use in graphic design applications. TIFF is also used in professional imaging workflows, such as in photography, printing, and publishing. It is ideal in situations where image quality and color accuracy are critical, and the file size is not a major concern.    

Curious about how to convert PDFs to other file types? Check out What's Your Type? Understanding PDF File Types.

Image Color Management    

A single PDF document can support a wide variety of elements using different color models. Often a PDF file is produced and saved with elements in the DeviceRGB, DeviceCMYK and DeviceGray spaces that have an associated ICC profile. An element in a PDF that has an associated profile is considered calibrated.  Elements that do not have embedded profiles are considered un-calibrated. PDF processing software will often assign default profiles (referred to as working spaces) to un-calibrated elements. Graphics files, however, such as PNG, TIF, or JPEG, can only hold a single color profile. When PDF software rasterizes a page from a PDF document to create a graphic file, it will assign default profiles for un-calibrated elements in the PDF, or you can specify the input and output color profiles you want to use from a stream or file. When the software initializes, it identifies the color profiles present in the subject PDF document, and that are available on the host machine. At Datalogics, we offer two products to help you programmatically convert PDF to image: Adobe PDF Library and PDF2IMG.   

PDF to Image Conversion with Adobe PDF Library 

Conversion via the Core Library APIs (C++ / .NET / Java):

At its foundation, APDFL’s core C++ API can rasterize PDF pages into raw bitmap buffers using functions like PDPageDrawContentsToMemory*()  

Once rendered, your application is responsible for writing that bitmap to a standard image file format (e.g. TIFF, JPEG, PNG) by adding appropriate image headers.  If you're using the .NET or Java interface, the library includes samples such as DocToImages and DrawToBitmap that directly render and export PDF pages to image formats like BMP, JPEG, PNG, TIF, etc. with no manual headers required.

Check out APDFL's PDF to Image Code Samples on GitHub here. 

PDF to Image Conversion with PDF2IMG: The Dedicated Conversion Utility 

For simple, ready-made PDF-to-image workflows, there’s PDF2IMG, a standalone command-line tool built upon the Adobe PDF Library.  Supported image outputs include JPEG, PNG, TIFF (including multi-page), BMP, GIF, EPS, RAW formats   PDF2IMG supports output resolutions up to 2400 dpi, various color modes (RGB/RGBA, grayscale, CMYK, L*a*b), ICC profile control, anti-aliasing, and high‑accuracy Adobe color management for enterprise use cases   You can run it via CLI, integrate it into server-side pipelines, or embed PDF2IMG functionalities into your own software via API support.

PDF2IMG Use Cases     

There are a number of different situations where one wants to transform a PDF into a simplified format. Some of these situations include:     

• Generating PDF file previews and thumbnails: many applications require users to preview documents, including PDF files. File management applications, document management systems, and web applications all have users who need to take in, at a quick glance, the form and content of a document in order to decide how to handle it. With PDF2IMG, your application can generate high-quality previews at the best resolution for the situation, and with smoothing and anti-aliasing for the most useful and useable results.     
  
• Converting PDFs which use advanced functionality for viewers: support for advanced PDF features varies across different viewing environments. Calibrated color, transparency, complex blending rules, and multi-channel colors – these are just a few of the features that may be present in PDFs, but which you user’s viewer may not properly support. When you need to retarget complex PDF files to a broad audience, one typical way is to render the PDF to an image format such as JPEG where the complexity can be “flattened out” into a final rendered form. With PDF2IMG, your application can render PDFs with the highest possible color and rendering quality. True Adobe PDF rendering and color management, along with smoothing and quality options, ensure that you can put the best possible renditions of complex PDF files in your users’ views and devices.           
• Supporting existing investments in pre-press and print facilities: many print and press facilities have existing capital and software investments in systems. Often, these presses and other equipment and facilities are functioning well but lacking reliable support for ingesting PDF files directly. With PDF2IMG, companies can extend the useable life and thus the return on these existing investments. PDF2IMG can generate Adobe EPS or raster files for use in print production workflows, with accurate and calibrated color and reliable PDF processing.     
  
• Compatibility with archival and legacy workflow requirements: many standards for electronic document archiving mandate the use of raster image formats, such as TIFF files. Legacy workflows, such as electronic fax servers, further restrict the formats one can use for electronic documents. With PDF2IMG, you can update your workflows to enable archiving and processing of PDF files in these sorts of archival and legacy systems.  

To learn more about PDF rendering with PDF2IMG, download a free evaluation.

Developer Workflow Example 

• In C++, call PDPageDrawContentsToMemory() to generate a raw image buffer of each page, then wrap that buffer in a format-specific header before saving as an image. 
• In .NET/Java, use the provided samples (DocToImages or DrawToBitmap) to handle most of that automatically and output your desired image format. 
• If you prefer shell scripting or off‑the‑shelf utility usage, install PDF2IMG, specify resolution, color mode, and output format on the command line, and it handles the rest.

We hope you found this guide helpful! Don't hesitate to contact us with any questions about how our products help with PDF to image conversion.

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