Images will be compressed using a lossy compression technique, and images with resolution greater than 150dpi will be downsampled. The following image optimization settings are available when using Nitro Pro 7‘s Optimize PDF tool:Ĭreates files optimized that are optimized for on-screen viewing. For example, typical computer monitors have a resolution between 72dpi and 96dpi, which is the highest resolution the monitor can display. In general, it is a good idea to downsample images based on the resolution of the device you are sending the file to.
Since there is less information that needs to be saved, the resultant PDF file sizes can be considerably smaller. Because lossy compression discards data, it can achieve smaller file sizes than lossless compression, but may not be suitable for high-quality printing, or if you later need to extract the image for editing or reuse.ĭownsampling reduces image resolution by lowering the number of dots per inch (DPI) that the image contains. Lossy: Eliminates “unnecessary” bits of information from the image.If an image is compressed using a lossless compression technique, it is identical to the original in visual quality, and can be useful if you need to extract the images for editing later. Lossless: Reduces the file size of an image file without loss of data, by removing only repetitive information.There are two primary techniques used in optimizing images: compression and downsampling. Optimizing images in your PDFs allows you to create the perfect balance between file size and visual quality, depending on how your files are to be used.
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