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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Bug – Anti-aliasing does not work when reading a PDF
A typical command antiaoiasing invocation is: You will need to add the following line to your makefile: The equivalent CMYK color for each spot color is determined using the alternate tint transform function specified in the Separation and DeviceN color spaces.
The best thing you can do with ghoostscript a PDF is to just ‘rasterize’ it again with the source density dpi in your case. Otherwise ask for the page size by specifying only its dimensions.
Still this option is there to enable tuning by hand, although it is deprecated. This is the case, for instance, if you open the top cover error E5 on the printer’s display. We recommend moving to the ijs device for all such printing.
Please note that JPEG is a compression method specifically intended for continuous-tone images such as photographs, not for graphics, and it is therefore quite unsuitable for the vast majority of page images produced with PostScript. A known issue with this driver is poor support for margins and page size. Ghostscript sets the physical device size to that of the Windows printer driver, but it does not update ghostsdript PostScript clipping path.
For anything other than pages containing simple images the lossy compression of the jpeg format will result in poor quality output regardless of the input. As of the 0.
[gs-bugs] [Bug 694413] New: No anti-aliasing when converting some PDFs to raster images
In some cases, this will cause an additional page to be ejected at the end of a job. A collection of such formats ‘output devices’ in Ghostscript terminology are described in this section.
The inch measure is sometimes represented by in or a quotation mark ” to the right of a measure, like 8. This can be changed by: Otherwise if the requested page size matches one of the Windows standard page sizes in landscape mode, ask for that standard size in landscape.
The conversion from this into the 6- or 7-color space the “ink split” is done by lookup tables in the setup file. I made my tests using the script shown here. In order to use these drivers, you will need the HP Inkjet Server as well as Ghostscript, available from http: It has natialiasing support for image compression and alternate color spaces, and so can be a useful way to output CMYK. Here is an example of such a setup file: The pngmonod device is also a black-and-white device, but the output is formed from an internal 8 bit grayscale rendering which is then error diffused and converted down to 1bpp.
These are all implemented as ‘downscale’ devices, which means they can implement page level anti-aliasing using the -dDownScaleFactor switch. In 1bpp mode, the device renders each component internally in 8 bits, but then converts down to 1bpp with error diffusion before output as described below in the tiffscaled device.
Values of 0 to 2 work as expected, but values 3 ghostscrilt 4 while accepted for compatibility will behave as for ghosscript. This version of Ghostscript includes the patch from version 0. It is supported by the pcxmono pcxgray pcx16 pcx pcx24b pcxcmyk series of devices. The pngalpha device is bit RGBA color with transparency indicating pixel coverage. The available devices are: A special case is s: To override these defaults, the TrapOrder parameter can be used, for example: Further, in the comments section, there is a good comment which should be posted as an answer.
[gs-bugs] [Bug ] New: No anti-aliasing when converting some PDFs to raster images
They are particularly useful for testing or as input to an external conversion utility. The slopes seem like staircase. This is the default.
This is the case, for instance, if you open the top cover error E5 on the printer’s display. Please see the Use documentation for a complete description. Any device author interested in trying these options should contact Artifex for more information. In case of common printer problems like being out of paper, a warning describing the reason is printed to stdout. Points Points are a measure traditionally used in the printing trade and now in PostScript, which specifies exactly 72 points per inch approximately And once it’s built, you won’t have to recompile Ghostscript to support new drivers!
If you read the thread for the bug you opened in Bugzilla you’ll see why other options aren’t going to work, ajtialiasing need to use one of the ‘scaled’ devices.