This is the best setting for high-quality printing.
Purpose: Maintains the quality required for professional printing processes.
- Images are uncompressed or compressed with a very low compression ratio.
- The resolution is reduced to 300 dpi (dots per inch) for color and grayscale images.
- Images are not reduced if they are already below 300 dpi.
This option is the default setting and offers a good balance between file size and quality.
Purpose: General use, suitable for both digital and print.
- Images are reduced to 150 dpi for color and grayscale images.
- The compression is moderate and results in a significant file size reduction.
This setting is optimized for on-screen viewing, such as on an e-reader or tablet.
Purpose: Minimum file size for digital distribution.
- Images are downscaled to 150 dpi for color and grayscale images.
- Uses stronger compression, which may result in a noticeable loss of image quality.
This is the most aggressive compression option.
Purpose: For viewing on screen, but with an emphasis on the smallest possible file size.
- Images are downscaled to 72 dpi, which is the standard resolution for most screens.
- Uses very strong compression, which may result in low image quality but results in the smallest file size.
gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/default -dNOPAUSE -dQUIET -dBATCH -sOutputFile=compressed-default.pdf input.pdf