This is not the same as -normalize, which is equivalent to -contrast-stretch x0 % All the channels are normalized in concert by the same amount so as to. Desired preservation format for ingested pdf files is pdf/archival. Ghostscript can convert from pdf to pdf/a but it’s a 2-step process: pdf2ps (converts. Invalid. Not a Ghostscript error and applies to only a small number of pdf files with interpolated images. From PDF/A in a Nutshell.
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The documentation is kept here for reference. Be advised that these devices will be removed in future versions of Ghostscript.
For other information, see the Ghostscript overview. You may also be interested in how to build Ghostscript and install itas well as the description of the driver interface. It should not be used in new code. Much of the driver is based on ideas derived from the cdj driver of George Cameron.
The support for the hp, hp, hp and hp was added by Martin Gerbershagen. The hp is supported through the hp device, the hp, hp and the hp through the hp device. The following switches are supported. Therefore the driver is not what you would expect to be a fast driver ;- This is no problem when printing a full-sized color page because printing itself is slowbut it’s really annoying if you print only text pages.
Maybe I can optimize the code for text-only pages in a later release. Right now, it is recommended to use the highest possible optimisation level your compiler offers. Since the printer itself is slow, it may help to set the process priority of the gs process to “regular” or even less. Also make sure that print The printer default settings compensate for dot-gain by a calibrated color-transfer function.
This will only work when -dMasterGamma is set to a value greater than 1. Further information, bugs, tips etc, can be found at my website. To learn more about gamma, see ftp: This is a modified version of the HP8xx driver written by Uli Wortmann.
More information and download are available at http: All printers are supported through the cdj device. The printer default settings compensate for dot-gain by a pre-defined color-transfer function.
ps2ps(1): Ghostscript PostScript distiller – Linux man page
All these drivers have 8-bit monochromebit and bit colour and for the DJ C, bit colour, CMYK mode options in addition to standard colour and mono drivers. It is also possible to set various printer-specific parameters from the command line, for example.
That is, we can use. The DeskJet’s maximum printing width is dots, or 8 inches The printer manuals say that the maximum recommended printing height on the page is All DeskJets have 0. Side margins are approximately 0. Several printer “properties” have been implemented for these printers. Those nornalize so far are all integer quantities, and thus may be specified, for instance, like.
If guostscript symbol is undefined, the default is 24 bits per pixel. It is, of course, still possible to specify the value from the command line as described below. Note also that the cDeskJetcdjcolor and cdjmono drivers are unaffected by setting this symbol, as their default settings are predefined to ghhostscript 1, 3 and 24 respectively.
All of the drivers in gdevcdj. This gives considerable flexibility in choosing various tradeoffs among speed, quality, colour, etc. The valid numbers are:.
Thus it is often the case that the printed result is rather too dark. A simple empirical correction gyostscript this may normmalize achieved by preceding the actual PostScript file to be printed by a short file which effectively sets the gamma for the device, such as.
This does the gamma correction after whatever correction the device might be normakize already. To do the normaliae before the current correction. This example sets the gamma for R, G, and B to 3, which seems to work reasonably well ghostscrpt practice.
This feature is available on HP’s more recent inkjet printers, including the DeskJet monomono or colour and C mono and colour. The colour and monochrome drivers for the HP DeskJet c are probably the best you will get for use with Ghostscript, for the following reasons. In effect what you have is dpi dot positioning, but on average you don’t get more dots per line. This provides the possibility, for instance, to have sharper character outlines, because you can place dots on the edges nearer to their ideal positions.
This is why it is bhostscript doing. However, HP will not support user-level programming of this resolution-enhanced mode, one reason being that I understand all the dot spacing has to be done by the driver, and if you get it normaliz, you can actually damage the print head.
To summarise, you may lose a smidgin of potential text clarity using the c drivers cdjcdjcolorcdjmono etc. For all the printers above, the choice of paper is critically important to the final results. The printer manuals suggest type of paper, but in general, smoother, less fibrous types give better results. In particular, the special ink-jet paper can make a big difference: Similarly the special coated transparencies also work well and ordinary transparencies do not work at all!
The Unix procedure unix-lpr.
ps2ps(1) – Linux man page
It is not always easy for me to test all of these drivers, as the only colour printer I have here is the DeskJet C. I rely on others to test drivers for the additional machines and report their findings back to me. These files also handle the Japanese Canon F printer. Usage of this program is neither supported nor endorsed by the Canon corporation. Please see the Ghostscript license regarding warranty.
Software drivers for Windows and Mac are usually included and can be downloaded from the Canon web sites like http: If these drivers cannot be used for some reason, then at present Ghostscript is probably the alternative giving the best results.
The BJC has features not found among the specs of earlier bubble jet models except the even more advanced BJC and is advertised to offer:. Access to features 5 and 6 requires use of the original Canon drivers for the foreseeable future. No re compilation of Ghostscript is normally required. Ghostscript comes with a relatively highly configurable driver, called uniprintfor printers which understand raster images in various propriety formats. Most options for this driver are usually organized into files having the suffix “.
But when using them for a BJC the result is unsatisfactory. This distribution includes six new uniprint control files:. Here is an explanation of my file name convention: The next two letters indicate the print media:. The last letter stands for a quality factor that effects also the print speed presumably related to the number of passes that the printhead makes.
The output of Ghostscript is then typically MByte. The bootleneck seems to be the transfer of the raster image in run-length encoded Canon format to the printer via the parallel port on my system or the printer’s speed, not Ghostscript or the uniprint renderer.
So far I have only experimented with the printer initialization code at the beginning of each page -dupBeginPageCommand and the resolution -r. Other options, particularly the transfer arrays -dupBlackTransfer, -dupCyanTransfer, -dupMagentaTransfer, -dupYellowTransfer and the margins -dupMargins were simply copied from the files for the BJC, but they may need to be changed for optimized performance. The “-r” option in the control file must of course match this line.
Other resolutions might work as well, but I didn’t try. The unused colors are photo or light cyan c and magenta m. These modes supposedly produce prints of the best quality that the Canon driver can offer. Therefore expanding uniprint’s capabilities for six colors would be interesting, but it may not increase the output quality of 6-color printers such as the BJC drastically. More control files for uniprint could be added in order to offer more versatility for controlling normlize BJC within a Ghostscript installation.
The number of possible combinations nkrmalize media type, resolution and print quality factor is very large, many combinations would not make much sense, many might be used here and there, but relatively rarely. The user would have to remember a name for each combination that is used.
A better way would be to let the user patch optionally a user owned or system wide uniprint control file before each print via some print tool. This is similar to the approach taken by Canon with their driver for Windows.
Similarly a uniprint tool could also incorporate other functions such as printing test and demo pages and the low ink warning once the protocol for this is known. Clearly it would be difficult to code such a uniprint tool for all the platforms where Ghostscript is running.
In order to install a BJC printer on a RedHat Linux system with RedHat’s printtool, you need also to insert with a text editor the contents of the file bj8. Insert it most appropriately after the section. That model is sold for the Japanese market only. The specs and also the external look are the same as those of the BJC models for the American and European markets.
I expect that the raster image mode which is used exclusively by Ghostscript is entirely compatible for both models. We tried to make it evolve synchronously, though Yoshio cannot be reached since a long time ago.
The drivers are based on code for the HP printers by George Cameron in fact, they are in the same file! That release was also the first one to be able to use the full width of an A3 paper size. They are incomplete, but they can be used to drive the printers’ main features. Configure the drivers by modifying the default values in the file gdevbjc. If you don’t do that, the drivers use reasonable defaults that make them work “as expected”.
All default values shown here are defined in that file.