ghostscript -sDEVICE=pdfwrite -dCompatibilityLevel= /ebook selects medium-resolution output similar to the Acrobat Distiller "eBook" setting. Parameter name, Notes, default, screen, ebook, printer, prepress . Older versions of Ghostscript don't examine the image to decide between. This document describes how to use the command line Ghostscript client. Ghostscript's built-in help message (gs -h) lists the available output devices.
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The PDFSETTINGS are contained in ghostpdl/Resource/Init/cojitcaselmo.ga, so you can see how these are set. You don't need to (and shouldn't. -dPDFSETTINGS=/screen # lower quality, smaller size. -dPDFSETTINGS=/ebook # for better quality, but slightly larger pdfs. Overview. pdfebc is a CLI tool that uses Ghostscript to compress PDF documents to a size that befits an ebook reader, such as a site.
The last entry in the dictionary which has numeric keys is a non-standard Ghostscript extension type of PageSize where the array has four elements rather than the standard two elements. This four element array represents a page size range where the first two elements are the lower bound of the range and the second two are the upper bound. By default these are [0, 0] for the lower bound and [16 fffff, 16 fffff] for the upper bound.
For actual printers, either the entire InputAttributes dictionary should be replaced or the range type entry should not be included. Using this option will result in automatic rotation of the document page if the requested page size matches one of the default page sizes.
Compressing PDFs using Ghostscript under Linux
This allows the -dPSFitPage option to fit the page size requested in a PostScript file to be rotated, scaled and centered for the best fit on the specified page. See the section on finding files for details. Sometimes the initialization files are compiled into Ghostscript and cannot be changed.
On Windows and some Linux builds, the default paper size will be selected to be a4 or letter depending on the locale. Interacting with pipes As noted above, input files are normally specified on the command line.
However, one can also "pipe" input into Ghostscript from another program by using the special file name '-' which is interpreted as standard input. Because of this, options and files after the '-' in the command line will be ignored. On Unix and MS Windows systems you can send output to a pipe in the same way.
In the last case, -q isn't necessary since Ghostscript handles the pipe itself and messages sent to stdout will be printed as normal.
All the normal switches and procedures for interpreting PostScript files also apply to PDF files, with a few exceptions. This is useful for creating fixed size images of PDF files that may have a variety of page sizes, for example thumbnail images.
This option is also set by the -dFitPage option. If neither of these is specified, the output will use the screen options for any output device that doesn't have an OutputFile parameter, and the printer options for devices that do have this parameter. This may include any extra bleed area needed to accommodate the physical limitations of cutting, folding, and trimming equipment. The actual printed page may include printing marks that fall outside the bleed box.
The trim box defines the intended dimensions of the finished page after trimming. Some files have a TrimBox that is smaller than the MediaBox and may include white space, registration or cutting marks outside the CropBox. Using this option simulates appearance of the finished printed page. The art box defines the extent of the page's meaningful content including potential white space as intended by the page's creator. The art box is likely to be the smallest box.
It can be useful when one wants to crop the page as much as possible without losing the content.
Unlike the other "page boundary" boxes, CropBox does not have a defined meaning, it simply provides a rectangle to which the page contents will be clipped cropped. By convention, it is often, but not exclusively, used to aid the positioning of content on the usually larger, in these cases media.
For files created with encryption method 4 or earlier, the password is an arbitrary string of bytes; with encryption method 5 or later, it should be text in either UTF-8 or your locale's character set Ghostscript tries both. Annotations are shown by default. Annoation types listed in this array will be drawn, whilst those not listed will not be drawn.
By default, AcroForm is not enumerated because Adobe Acrobat doesn't do this. This option may be useful for debugging or recovery of incorrect PDF files that don't associate all annotations with the page objects.
This may be useful for backward compatibility with old versions of Ghostscript and Adobe Acrobat, or for processing files with large values of UserUnit that otherwise exceed implementation limits.
On TrueType fonts, this is often a hollow sqaure. Ghostscript now attempts to mimic this undocumented feature using a user parameter RenderTTNotdef. Pages of all documents in PDF collections are numbered sequentionally. A list can include single pages or ranges of pages. Ranges of pages use the minus sign '-', individual pages and ranges of pages are separated by commas ','.
A trailing minus '-' means process all remaining pages. The list of pages should be given in increasing order, you cannot process pages out of order and inserting higher numbered pages before lower numbered pages in the list will generate an error. The PDF interpreter and the other language interpreters handle these in slightly different ways.
Because PDF files enable random access to pages in the document the PDF inerpreter only interprets and renders the required pages. PCL and PostScript cannot be handled in ths way, and so all the pages must be interpreted. However only the requested pages are rendered, which can still lead to savings in time. Files that are less than 1 MB in size are not compressed, as I have found that compressing such small files often leads to them increasing in size several times over instead I have yet to figure out why.
Use Ghostscript to Reduce PDF File Size
Do note that Ghostscript is fairly slow, so expect large files to take a while to compress. As an example use case, I mainly use pdfebc as an easy way to compress lecture slides and similar study materials, send them to my site and then clean up the output. Purpose of the project The core functionality of pdfebc was already done when I started this little project. I am also diving deeper into how to use git and trying new things, so the commit history is a bit inconsistent.
Requirements Python 3. Ghostscript pdfebc requires Ghostscript for the PDF compression. The default binary is gs, but this can be specified via the CLI.
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Note that TLS is enabled and will likely cause sending e-mails using a local server that does not have TLS impossible. Option 1: Install from PyPi with pip The latest release of pdfebc is on PyPi, and can thus be installed as usual with pip. I strongly discourage global pip installs i.
A per-user install can be done like this: Execute pip install --user pdfebc to install the package.The trim box defines the intended dimensions of the finished page after trimming.
For example:. TrimBox and BleedBox entries are generated in page descriptions. You may specify either an absolute file name, or a relative path from the working directory. This enables features such as page extraction, N-up printing and so on to be performed. PDF 2.
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