Database Reference
In-Depth Information
Browser transformations
This is where we set the exact transformation to be done. More than one
transformation may be supported per MIME type. For example, for the image/jpeg
MIME type, we have two transformations available— image/jpeg: inline for a
clickable thumbnail of the image and image/jpeg: link to display just a link.
As we can see in the following image, moving the mouse over each choice in the
drop-down menu provides a short explanation of the corresponding transformation.
A more complete transformation explanation and the possible options are available
on clicking the transformation descriptions link.
Transformation options
In the Examples of transformations section, we will see that some transformations
accept options. For example, a transformation that generates an image will need the
width and height in pixels. 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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