The document viewer allows you to display documents using inverted colors. For example, you may prefer to see white pixels as black and black pixels as white.
The Invert toolbar button allows you to set your preference for color inversion. The document viewer preserves your preference when you open different documents. If the last document you view before logging out is inverted, then the next document you view upon login will be inverted too.
This method of inversion is different from the Process | Invert right-click option, which inverts colors only until you navigate away from the document.
To invert colors:
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Click the Invert button in the viewer control toolbar.
The document colors are inverted.
Click the Invert button again to revert the document to non-inverted colors.