Adobe created the portable document format, or PDF, so that files could be shared easily across computer platforms. Adobe PDF documents can be multi-page documents or single-page documents, and can include an array of graphics and text in an assortment of colors. For people with vision problems, reading lighter-colored fonts can be difficult. You can change the preferences in Adobe Reader to show text in different colors.
Open Adobe Reader. Click the "Edit" drop-down menu and choose "Preferences."
Select "Accessibility" in the navigation pane on the left.
Check the box beside "Replace Document Colors." This opens the other options for editing.
Select "Custom Color." At this point, you can modify the background color and the font color. To change font color, click the color palette box beside "Document Text."
Select the color from the small palette box. You can also choose "Other Color" to further customize your font color. Select your color and click "OK."
Darker-colored fonts are easier to read on white backgrounds.
The information in this article is relevant to Adobe Reader XI, and may differ with other versions.