PDF to image converter

Availability

Orbeon Forms 2016.1 and newer.

Introduction

This processor converts a PDF document into a single image document.

When the output format is TIFF, the processor creates a multi-page TIFF containing one page for each page in the PDF document. For other output formats, only the first page of the PDF document is used and a single image is created.

When using the TIFF format, if the destination format is bitonal (black and white), dithering is applied.

Basic usage example

<p:processor name="oxf:pdf-to-image">
    <p:input name="data" href="#pdf-data"/>
    <p:input name="config">
        <config>
            <format>tiff</format>
            <compression>
                <type>LZW</type>
                <quality>0.8</quality>
            </compression>
            <scale>2.0</scale>
        </config>
    </p:input>
    <p:output name="data" id="image-data"/>
</p:processor>

Inputs and outputs

• data input: receives the PDF document to convert as a binary document.

• config input: receives the configuration of the transformation.

• data output: produces the resulting image as a binary document.

The config input supports the following elements:

• format:

  • one of gif, png, jpeg, or tiff

  • mandatory

• scale:

  • scaling factor

  • optional

  • defaults to 1.0

• compression

  • compression settings

  • optional

  • type child element

    • only meaningful for tiff format

    • one of CCITT RLE, CCITT T.4, CCITT T.6, LZW, JPEG, ZLib, PackBits, Deflate, EXIF JPEG or none

    • defaults to none

  • quality child element

    • only meaningful for gif, jpeg and tiff formats

    • value is a double-precision number from 0.0 to 1.0

Examples of configurations

GIF output:

<config>
    <format>gif</format>
    <scale>3.0</scale>
    <compression>
        <quality>0.5</quality>
    </compression>
</config>

JPEG output:

<config>
    <format>jpeg</format>
    <scale>3.0</scale>
    <compression>
        <quality>1.0</quality>
    </compression>
</config>

PNG output:

<config>
    <format>png</format>
    <scale>3.0</scale>
</config>

Black and white TIFF output with "CCITT T.6" compression:

<config>
    <scale>3.0</scale>
    <format>tiff</format>
    <compression>
        <type>CCITT T.6</type>
        <quality>0.5</quality>
    </compression>
</config>

Uncompressed TIFF output:

<config>
    <scale>3.0</scale>
    <format>tiff</format>
    <compression>
        <type>none</type>
    </compression>
</config>

Compressed TIFF output with LZW compression:

<config>
    <scale>3.0</scale>
    <format>tiff</format>
    <compression>
        <type>LZW</type>
        <quality>1.0</quality>
    </compression>
</config>