Image downsampling is used to control the size and quality of any images (such as pictures, screenshots, company logos) in the PDF file, which can help reduce the final size of the PDF.

 

Downsampling can be enabled or disabled and different levels set for color, indexed, greyscale and monochrome (or black and white) images.

The downsampling DPI can be set any where between 50 DPI and 2400 DPI by typing the desired level into the edit field, or using the spinbox up/down arrows to the right of each edit field to set the value.

Images will only be downsampled if the DPI of the image is greater than the requested DPI. If the DPI of the image is already less than the downsampling DPI, the image is not changed.

The Set to Defaults button in the lower right will reset the currently displayed options back to factory defaults.

See Also: Image Compression, Controlling Image Size and Quality with Downsampling