• Pdf Thumbnail Generator
• Convert Pdf To Thumbnail
• Create Thumbnail From Pdf C#
• C# Create Pdf From Html
• How To View Pdf Thumbnails
• Create Pdf Thumbnail Image

December 2006 Version (Old Style Thumbs)

October 2007 Version (New Style Thumbs)

Introduction

Create thumbnail for your PDF files. Thumbnail can be generated from a bitmap (.BMP) or a JPEG (*.JPG) or even a EMF (Encapsulated Meta File). When thumbnails are created and embedded into your PDF files, you will see the thumbnails displayed on the left column of your PDF Reader or Viewer (usually Adobe Reader). VB.Net PDF Creation and Editing VB.Net & ASP.Net PDF. Learn how to create and edit PDF documents in VB.Net applications and websites. A frich tutorial with code examples. View Veronica's Vb.Net PDF Tutorial.

Create a Thumbnail in C#. This article explains the best ways to create thumbnail images dynamically. Make thumbnail image using ASP.Net. Purushottam Rathore; Feb. Create a Thumbnail Image for Your PDF Documents. Follow the steps below to create a thumbnail image to supplement. To link the thumbnail image to your PDF. Updated August 29, 2015. Creating PDF thumbnails in JS with PDF JS.

This project is based on the excellent project by Jonathan Hodgson, found here. Most of the tougher parts of this lump of code is his work, and the full credit goes to him for that. Reading his article will help enormously in understanding the workings and limitations of this project.

His version hasn't been updated in 2.5 years and unfortunately it lacked a few important options, mainly in configurability. This version has a few extra options, which allow for a more wide-spread usability and greater flexibility.

Note after October 2007 update: In the original version, only simple thumbnails were generated. Since then, the codebase has moved on to generate a more elaborate thumbnail style. To generate the old style thumbnails, please use the codebase from December 2006, as the changes are incompatible with the old version. This description will focus on the elaborate thumbs, and will, where needed, add references to the old codebase.

Using the Code

The code is mainly based on a few fairly simple scripting examples, but the combinations render a decent result.

The most important change to Jonathan's code is the added recursiveness of the script. It is now able to work from a starting dir, and from there make thumbnails for all PDF files in that dir and its subdirs.

Next to that, the most important variables are now configurable from the config file, taking care of endless rebuilding for path- and thumbnailsize-changes. Next to that, the startdir is also available as a command-line parameter. Just add the path to start after the executable. e.g. pdfthumbnail.exe c:pdf.

Pdf Thumbnail Generator

Lastly the few minor bugs that the original script contained have been fixed.

The full Adobe Acrobat (not the free reader) must be installed on the machine to run this application. This code has been tested with Acrobat versions 6.0 to 8.0. In notes on which version to use, see the Points of Interest section.

Luckily, at the time of writing, the Acrobat SDK is no longer needed for the application to function, which is a good thing considering the fact that the SDK is really hard to find nowadays.

For detailed descriptions of the main Acrobat functions, please read Jonathan's article, it'll be a great help. Here I will focus on the main changes and most important functions.

Part 1 - The Main Sub

First we start off with the starting code to process the given starting dir. The starting dir itself is configured using either the config file included with the binary or as a parameter in the command line.

Part 2 - The Config File

The config file currently has several options. Not only is the startdir defined (which is used above), but also the outputpath, the thumbnailsizes and several other variables are defined.

In the recursive sub that does the actual work, we therefore start with requesting the first part of the variables from the config file. The second part is requested inside the codeblock that checks for the orientation of the file. For this code, see part 4.

Added here is rotatelandscapefiles parameter. This is enabled by default, and is used to rotate landscape oriented files to still generate a portrait thumbnail without losing too much detail in the thumbnail itself.

Part 3 - The Recursive Part

To make the project actually recursive, the function that checks the files needs to check not only the starting dir, but all dirs below that. To achieve this, we use the IO.SearchOption.AllDirectories option.

Part 4 - The PDF Code

This part of the code has been changed quite a lot from Jonathan's original code. We will take a look at the main blocks needed to generate the thumbnail.

In short, the following steps can be defined:

• Opening the PDF and acquiring the first page
• Copying the page to the clipboard and retrieving it for processing
• Checking for the orientation of the PDF and choosing the right overlay
• Preparing the overlay
• Preparing the PDF page
• Overlaying the PDF page with the overlay image
• Saving the thumbnail

We'll start with opening the PDF, acquiring the first page and copying it to the clipboard.

After this, we'll retrieve it again from the clipboard to process it. For that, we start by checking the orientation of the file. Here we also request the next part of variables from the config file, and use them to set the width and height of both the portrait and landscape scenarios. Here we also fix the relative sizes for odd-shaped PDFs.

The routine is fairly simple, though due to the many variables it might seem complex.
We start by detecting the sizes of the original PDF page, and check if the width of the page is smaller than the height (that would make it a portrait file). Next, to maximize the shown thumbnail, we check which of the two sizes (height or width) is the one to limit. To this we emulate the 'constrain'-function as seen in e.g. Photoshop. This renders us the optimal values for the thumbnail height and width without deforming it.

After this, we do the same for the landscape files, where depending on the value of the rotate-variable, we either rotate and process a portrait thumb or generate a landscape thumb.

Convert Pdf To Thumbnail

Next we use the overlay image to generate the final thumbnail. To do this, we first render the large page to a small bitmap. After this, we center the image according to the settings in the config file, and translate it to the right position to fit the mould.

Lastly we transform the image using a matrix function to give it the perception of depth needed to match up with the background image, and paste the layers on top of each other.

Next we output the result to an image using the encoding parameters, of which the quality of the output image is configurable in the config file. The encoding parameters use a function called GetEncoderInfo, which assembles all the parameters and uses them as input for the output image.

The function that takes care of the encoder parameters is stated as a separate private function:

Finally, we'll release all created objects. After this, the next statement starts to process the next file found.

Create Thumbnail From Pdf C#

Points of Interest

After all these code snippets, it's time to take a look at what this project cannot do. Sadly it isn't perfect, and, like all software, it has its limitations.

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First of all, it still requires a full Acrobat version. As commented before, the usage of the Acrobat libraries is not allowed for serverbased solutions. Though even Adobe isn't really clear about what is and what is not allowed, we'll consider this a grey area. It would be great if someone is able to remove the dependency to the Acrobat libraries. On the other hand, this way it works like a charm.

Secondly, there's still one strange bug. Somehow the application fails after 256 consecutive files processed if Acrobat 7.0 is used. Version 6 and 8 work fine, and both continue processing even after more than 2000 files. It will work with Acrobat 7 in blocks of 256 files though, but using 6 or 8 is severely recommended.
Note: This bug has been fixed in the 7th October 2007 update. You'll have to make sure though that Acrobat isn't waiting for updates or similar processes. To do this, open Acrobat and see that automatic updates are disabled. Secondly, make sure no popups or informative Windows show up when Acrobat is opened.

History

Updated on 13^th December, 2006

• Implemented several codefixes
• Added the config file in the source files package

C# Create Pdf From Html

Updated on 7^th October 2007

How To View Pdf Thumbnails

• Added code to control the quality of the image files
• Changed to 'deluxe' thumbnail style
• Several small codefixes (including 256 file-limit fix for Acrobat 7)
• Fixed deformation of the thumbnails of PDF-docs that use a non-standard page size
• Updated console output

Create Pdf Thumbnail Image