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Communicating ideas in digital documents can often be made much clearer through the use of layers. Layers have been supported in PDF documents since version 1.5 through optional content groups (OCGs), also known as PDF layers. “Optional” is key here. OCGs allow us to group images or annotations together, then control their visibility based on […]
Previously in the PDf Optimization In-depth Series. Resizing images Resizing images can provide significant gains in occupancy. For example, decreasing unnecessary high resolutions can dramatically reduce the file size without affecting the viewing experience. But sometimes it is also a pretty destructive approach. There exist many sophisticated resizing algorithms, but it is rare to obtain […]
Previously in our PDF Optimization In-depth Series: MRC compression in PDF documents is highly efficient in file size reduction without visible degradation of document rendering. MRC, also known as hyper-compression, is an image compression benefiting from image segmentation methods. It is particularly useful for images containing text and continuous-tone graphics. This method reduces the size […]
