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>
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