I am trying to use ghostscript to convert PDFs to TIFFs. It works nicely except that anti-aliasing does not appear to happen even when I request it. ?id= Bug ID: Summary: No anti-aliasing when converting some PDFs to raster images. i have some eps created with illustrator, when i convert images at dpi antialias of some text doesn’t work well, specially when font is Helvetica-Black.
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Next, make sure that the path and execution type are set in the top level makefile.
Open antiapiasing Windows printer with the merged orientation and size. When Tumble is false, the pages are oriented suitably at the left or right. I was using a PNG with an alpha channel.
While the guostscript used has many quality tuning options, none of these are currently exposed. The following codes are recognized: It is antialasing currently recommended for the faint of heart. This is the case, for instance, if you open the top cover error E5 on the printer’s display. Otherwise if the requested page size matches one of the Windows standard page sizes in landscape mode, ask for that standard size in landscape.
Multi-strip files reduce the memory requirement on the reader, since readers need only store and process one strip at a time. The tiffsep TIFF device also provide this parameter: See in the usage documentation all the paper sizes predefined in Ghostscript.
Comment 3 Ray Johnston Ghostscript sets the physical device size to that of the Windows printer driver, but it does not update the Bhostscript clipping path. When using the separation color space, the following options may be set using setpagedevice, as described in the PostScript Language Reference: Here is an example of such a setup file: Antiapiasing is also referred to as ‘bit depth’ or ‘pixel depth’.
And on it the anti-aliasing works as long as no images with alpha are used on the OpenOffice document.
Here are some commonly useful driver options that apply to all raster drivers. Trapping is a process whereby the output is adjusted to minimise the visual impact of offsets between each printed plane. If the Windows printer supports the duplex printing feature, then it will also be available through the mswinpr2 device. The values for Unix are as follows: Usually, this should match the Ghostscript resolution set with the -r switch.
Ghostscript supports a variety of fax encodings, both encapsulated in TIFF see above and as raw files. Their use is highly recommended for producing high quality rasterizations of the input files. This can be changed by:. If you specify more than is needed, the document will render more slowly.
Details of Ghostscript Output Devices
Display Devices Ghostscript is often used for screen display of postscript and pdf documents. These allow Ghostscript to preserve as much as possible the drawing elements of the input file maintaining flexibility, resolution independence, and editability. Still this option is there to enable tuning by hand, although it is deprecated.
As far as I know, Imagewriter commands are a superset of the Dot Matrix printer’s, so the driver should generate wntialiasing that can be printed on Imagewriters.
In some cases, this will cause an additional page to be ejected at the end of a job.
It is selected like this: Otherwise ask for the page size by specifying only its dimensions. As for other devices, the product resolution x page size is limited to antialjasing K pixels. After the spotcmyk device produces the binary data files, the files are read and PCX format versions of these files are created with “.
[gs-bugs] [Bug ] New: No anti-aliasing when converting some PDFs to raster images
Currently, the choices are 1 for one-bit dither, and 2for a 2-bit variable dot dither. Note that newer version of the hpijs drivers support the IJS protocol. High-level devices Ghostcript addition to raster image files, Antiaiasing supports output in a number of ‘high-level’ formats. The 1 bit per component output is halftoned using the current screening set by ‘setcolorscreen’ or ‘sethalftone’ which allows for ordered dither or stochastic threshold array dither to be used. A typical command line for IJS is: If desired the file names for the spot color separation files can be created by appending ‘.
For the png16m output device, antialiasing must be enabled explicitly for text and graphics. This section was contributed by Martin Schulte. The following properties can be set: The decimal number starting with 1 is appended to the basename of the PostScript input file or the basename of the filename specified with -outwhile keeping the extension.
The following options are available: In most cases, this flag won’t matter, but if you have a driver which works only with OutputFD such as hpijs 1.
Email Required, but never shown. First, make sure the IJS device is selected:. Attempting to do so will generate an error. You must set antiaoiasing orientation to Portrait and the page size to that expected by Ghostscript; otherwise the image will be clipped.
The values for Unix are as follows:.