How to run a portable version of Windows from your USB device. How to speed up Windows How to Resolve Common Mac Problems. How to easily reinstall Windows This string keyword specifies printer-specific "port monitor" filters that may be used with the printer.
If so, the corresponding port monitor "bcp" and "tbcp", respectively is listed in the printer's port-monitor-supported keyword. The "urischeme" portion of the keyword specifies the URI scheme that this port monitor should be used for.
Typically this is used to pre-select a particular port monitor for each type of connection that is supported by the printer. The "port monitor" string can be "none" to disable the port monitor for the given URI scheme. This string keyword provides a pre-filter rule. The pre-filter program will be inserted in the conversion chain immediately before the filter that accepts the given MIME type.
This UI keyword defines standard print qualities that directly map from the IPP "print-quality" job template keyword. Standard keyword values are "Draft", "Normal", and "High" which are mapped from the IPP "print-quality" values 3, 4, and 5 respectively. Each cupsPrintQuality option typically sets output mode and resolution parameters in the page device dictionary, eliminating the need for separate and sometimes confusing output mode and resolution options.
This boolean keyword tells the scheduler whether to print multiple files in a job together or singly. The default is "False" which uses a single instance of the backend for all files in the print job. Setting this keyword to "True" will result in separate instances of the backend for each file in the print job.
Currently it must be the string "1. This keyword defines additional option panes that are displayed in the print dialog. Each keyword adds one or more option panes. Since , AirPrint has enabled the printing of full quality photos and documents from the Mac without requiring driver software.
Starting with macOS As of macOS All new printer models should support AirPrint moving forward. This boolean keyword notifies the RIP filters that the destination printer requires the top and bottom margins of the ImageableArea to be swapped for the back page.
The default is true when cupsBackSide is Flipped and false otherwise. This string keyword specifies the Apple help book bundle to use when looking up IPP reason codes for this printer driver. The default is False. This keyword defines the location of a printer icon file to use when displaying the printer.
The file must be in the Apple icon format. This keyword defines presets for multiple options that show up in the print dialog of applications such as iPhoto that set the job style hint to NSPrintPhotoJobStyleHint.
Git stats 8, commits. Failed to load latest commit information. View code. This package contains backends, filters, and other software that was once part of the core CUPS distribution, but during the time when CUPS was developed at Apple, Apple stopped maintining these parts as they were not needed by Mac OS. In addition it contains more filters and software developed independently of Apple, especially filters for the PDF-centric printing workflow introduced by OpenPrinting and a daemon to browse broadcasts of remote CUPS printers and IPP printers to make them available locally.
Since CUPS 1. This version of cups-filters is only for CUPS 2. Please use the cups-filters 1. For compiling and using this package CUPS 2. This is the case for most modern Linux distributions. For Braille embosser support see below you will also need at least liblouis, ImageMagick, and poppler-utils.
Recommended is to also have liblouisutdml, antiword, docx2txt for more sophisticated Braille generation representing also the formatting of the input text.
None of these is needed for compiling cups-filters. This is done to support photo printing via AirPrint. The photo apps on Apple's iOS devices send print jobs as JPEG images and do not allow to set any options like "scaling" or the page size.
With "scale-to-fit" mode set by default, the iOS photos come out on one page, as expected. On low-resolution printers, like label printers with dpi, graphics output can get inaccurate and so for example bar codes do not work any more. This problem can be solved by letting Ghostscript use the center-of-pixel method. By default, the PostScript is generated with Ghostscript's "ps2write" output device, which generates a DSC-conforming PostScript with compressed embedded fonts and compressed page content.
This is resource-saving and leads to fast wire transfer of print jobs to the printer. Unfortunately, Ghostscript's PostScript output is not compatible with some printers due to interpreter bugs in the printer and in addition, processing by Ghostscript or by the printer's interpreter can get very slow with high printing resolutions when parts of the incoming PDF file are converted to bitmaps if they contain graphical structures which are not supported by PostScript.
Therefore there are two possibilities to configure pdftops at runtime: 1. Selection of the renderer: Ghostscript, Poppler, pdftocairo, Adobe Reader, or MuPDF Ghostscript has better color management and is generally optimized more for printing. Poppler produces a PostScript which is compatible with more buggy built-in PostScript interpreters of printers and it leads to a somewhat quicker workflow when graphical structures of the input PDF has to be turned into bitmaps.
It is less resource-consuming when rasterizing graphical elements which cannot be represented in PostScript like transparency. So its support is only experimental and distributions should not choose it as default. Printer make and model information comes from the PPD or via the "make-and-model" option.
Limitation of the image rendering resolution If graphical structures of the incoming PDF file have to be converted to bitmaps due to limitations of PostScript, the conversion of the file by pdftops or the rendering by the printer can get too slow if the bitmap resolution is too high or the printout quality can degrade if the bitmap resolution is too low.
By default, pdftops tries to find out the actual printing resolution and sets the resolution for bitmap generation to the same value. If it cannot find the printing resolution, it uses dpi. It never goes higher than a limit of dpi. Note that this default limit can get changed at compile time, for example by the Linux distribution vendor. The resolution limit for bitmaps can be changed to a lower or higher value, or be set to unlimited.
This is done by the option "pdftops-max-image-resolution", setting it to the desired value in dpi or to zero for unlimited. It can be used per-job or as per-queue default as the "pdftops-renderer" option described above. To find workarounds currently we have already workarounds for Brother and Kyocera it is much easier to work with uncompressed PostScript.
This option does not change anything if Poppler's pdftops is used as renderer. Problem is that CUPS only broadcasts its shared printers but does not browse broadcasts of other CUPS servers to make the shared remote printers available locally without any configuration efforts. The intention of CUPS upstream is that the application's print dialogs browse the Bonjour broadcasts as an AirPrint-capable iPhone does, but it will take its time until all toolkit developers add the needed functionality, and programs using old toolkits or no toolkits at all, or the command line stay uncovered.
For each reported remote printer it creates a local raw queue pointing to the remote printer so that the printer appears in local print dialogs and is also available for printing via the command line. In networks with only CUPS 1.
Also high availability with redundant print servers and load balancing is supported. If there is more than one server providing a shared print queue with the same name, cups-browsed forms a cluster locally with this name as queue name and printing through the "implicitclass" backend. Each job triggers cups-browsed to check which remote queue is suitable for the job, meaning that it is enabled, accepts jobs, and is not currently printing.
If none of the remote queues fulfills these criteria, we check again in 5 seconds, until a printer gets free to accommodate the job.
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