Adobe Acrobat Guide

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3. Make the most of your Adobe PDF file with useful metadata

The addition of metadata is regarded by authors as the finishing touch when it comes to producing PDFs. But quite often, this interesting function is overlooked.

Metadata is a technical term used to describe key information about a document like title, author, subject, and date, key words, copyright information, or just about any identifying material that gives the document a unique personality. This helps users distinguish one PDF from another when dealing with a bigger collection of files.

The metadata can be viewed in the document properties window or the document summary window of files made with many of today’s modern applications. When documents are enabled with metadata, they can be accessed more easily. Their content can be extracted, assembled, and re-used in a variety of formats. This type of information is coded using Extensible Mark-up Language, XML for short. If you want to add metadata to your project, start by opening the document’s summary dialog box, File menu > File Info… or in Acrobat, File > Document Properties. Metadata should be added at the time of creation whenever possible. Have in mind that this operation is well worth the effort. In larger institutions like schools and universities, adding this information can make it very easy to find, organize, and manage the vast collection of electronic material that quickly accumulates during each school year. This is possible after indexing the document with Adobe Acrobat Catalog. The advantage is due to the fact that the indexed documents return results much faster than if the PDF collection were not indexed.

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4. Finding user screen resolution with JavaScript

As mentioned, PDF is independent of the operating system installed on the computer, hence it can be assumed that a given PDF document will be viewed by all types of different computers with different preference settings and hardware configurations. Therefore, it is a good idea to run some JavaScript checks and change the behavior of the PDF accordingly.

To invoke the JavaScript editor, use the following keyboard shortcut: Ctrl+J. Once the editor is loaded, enter the following piece of JS code that will adjust the zoom level depending on the viewer’s screen resolution:

var monitors = app.monitors.primary();

var res = monitors[0].rect;

if(res[2] > 800 && res[3] > 600)
{
// sets the document zoom to 100%
this.zoom = 100;
}
else
{
// sets the document zoom to 65%
this.zoom = 65;
}

The first line creates a variable called ‘monitors’ that you will use in order to determine the screen resolution of the viewer, by calling the ‘rect’ function. The level of zoom is set by the zoom function, while ‘this’ is a pointer that points to the PDF document that is currently opened.

5. Reducing the size of a PDF file

In Acrobat 7.0 Standard and Professional, there is a command called “Reduce File Size” under the File menu. The name speaks for itself really. This command provides a very simple, method of decreasing the size of a PDF file just with a single click of the mouse. A good tip here is to save the original version of the file, before making any changes just to be on the safe side and also to be able to compare the new file with the old and larger version and see how much KBytes you saved.

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