Databases Reference
In-Depth Information
The following screenshot shows the list of the available transformations:
A more complete transformation explanation and a list of the possible options are
available on clicking the question mark icon next to
Transformation options
, and
then clicking on the
transformation descriptions
link that appears.
Assigning values to transformation options
In the
Examples of transformations
section, we will see that some transformations
accept options. For example, we can indicate the width and height in pixels for a
transformation that generates an image. A comma is used to separate the values in
the options list, and some options may need to be enclosed within quotes.
Some options have a default value, and we must be careful to respect the
documented order for options. For example, if there are two options, and we
only want to specify a value for the second option, we can use empty quotes as a
placeholder for the first option, to let the system use its default value.
Requirements for image generation
Normal thumbnail generation requires that some components exist on the web
server, and that a parameter in
config.inc.php
be correctly configured.
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