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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