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Each of the three color-categories for the custom Creation Profile allows the user to downsample images according to resolution and quality requirements.

Downsampling options

1. Don't Downsample – This option disables image downsampling in the created PDF document to produce the highest quality of output possible. It is recommended to select this option if the PDF will be used for printing to a commercial quality printer.
2. Average – With this option selected, neighboring pixels in an image are averaged, and pixels of similar value are replaced with the calculation of their average pixel color. Averaging generally produces good quality results and is suitable for printing to most home and office printers.
3. Subsample – This option configures PrimoPDF to take a pixel from a sampled area and replace the entire area with the selected pixel. Subsampling produces smaller file sizes and PDF creation is faster, however a decrease in visual quality may be noticed.
4. Bicubic – When selected, PrimoPDF uses bicubic interpolation to generate new pixel values. This is achieved by using a special averaging calculation to retain the highest possible quality, and can create better quality results than the other sampling methods. This however slows down the PDF creation process since the calculations are more complex to compute.
5. Downsampling Threshold - The Color, Grayscale, and Mono categories in the Custom Creation Profile all allow the user to downsample images above a predetermined threshold. This assists in reducing the PDF file size since any image above the specified resolution will automatically be downsampled to the configured value.