PDF documents can vary considerably, depending on the type of content they contain and the way in which they were created. Because these variations can affect the redaction process, you should examine your documents before you mark them up for redaction.
In order to redact any PDF document, the file cannot be encrypted. To check this, open the document you want to redact and select:
File > Document Properties (Acrobat 7)
File > Properties (Acrobat 8, 9, X, and XI)
When the dialog window opens, choose the Security tab and make sure that the Security Method: is set to “No Security”.
You can have Redax search your file for areas containing text, bitmap images, and vector images. The following example looks at finding vector images in the Redax sample file.
vector image. One of two major graphic types. (The other type is a bitmap image.) Vector graphics are made up of paths — mathematically defined lines and curves with specific start and end points. Line drawings and animations are examples of vector graphics.
When you mark a vector image for redaction, it is important to know the location of its constituent paths. That’s because each path you include in the mark up area will be redacted from start to end, even if you only mark up part of the path. You cannot see the paths when you look at a vector image, but you can have Redax find them for you.
In the following exercise, you will find all of the vector images, and their constituent paths, in the sample file.
In Acrobat, open Sample.pdf.
The following figure shows part of page 1 of the sample file.
Create a copy of Sample.pdf, so that you can work with the copy and keep the original, unmarked file for future use:
- Select File > Save As.
- Make sure the directory that contains Sample.pdf is selected.
- Enter the following file name for the copy: MySample.pdf
Click Save. MySample.pdf is created and displayed.
Select Redax > Find Areas > Find Path Areas.
Redax draws boxes around all of the paths in the document and tells you how many annotations (boxes) have been created.
Click OK to continue.
Scroll through the document and look at the Redax boxes.
You will see that some of the boxes, like those on the first four pages, are simply borders around text or graphics.
Others, like the graph on page 5, are more complex.
Note: The page number refers to the PDF page number, not the page number printed on the document.
Now examine the image on page 18.
It contains four Redax boxes, as shown below. One marks the path that makes up the border around the graphic. The other three mark the paths that constitute the pie chart.
Select File > Save.The Redax boxes marking paths in vector graphics are saved (you will remove them before you mark up the document for redaction).
In the following exercise, you will print page 18 of MySample.pdf, including the Redax boxes that delineate the paths in the pie chart. You will use this printout later when you mark up the pie chart for redaction.
Make sure you are on page 18 of MySample.pdf (see Step 6, above).
Select File > Print.
The Print dialog box opens.
In the Printer section, select a printer.
In the Print Range section, select “Current Page”.
In the Comments and Forms box, select “Document and Markups”.
Any Redax boxes on the current page of the document should be visible in the Preview window.
Click OK to print.
File the printout in a place where you can easily find it.
Select Redax > Remove Redax Boxes.
All Redax boxes are removed from the document.
Select File > Save.
MySample.pdf is saved.
Congratulations! You are finished evaluating MySample.pdf.
In this chapter, you learned the importance of evaluating documents before you mark them up for redaction. First, you created a copy of the sample document, Sample.pdf, and called it MySample.pdf. Next, you examined the vector graphics in MySample.pdf and saw that they were made up of paths. Finally, you printed the graphic on page 18, because you will need to know where its paths are when you mark it for redaction.
Finding paths is just one part of a document evaluation. When you evaluate your own documents, you should also look for hidden text and inline character images.
- Hidden text is text that is hidden behind an image. You need to find any hidden text in your document in case it needs to be redacted.
- An inline character image is a picture of text, although it usually looks just like text that was typed. You need to be able distinguish inline character images from real text, because images cannot be marked for redaction in the same way that text can.
To find out how to examine your document for hidden text and inline character images, see Evaluating Your Document in the Redax User Guide.
- Why is it necessary to evaluate a document before you mark it up for redaction?
- What is a vector image?
- What is a path?
- Why do you need to know the locations of the paths in a vector image before you mark it for redaction?