- Ghostscript's PDF interpreter is now able to make use of the
DroidSansFallback TrueType font to automatically substitute for
missing CIDFonts. Whilst it is always best to ensure the
original CIDFont is available for the best and most accurate
output, the ability to make an automatic substitution will be
valuable for those merely viewing or proofing such files.
- This release includes support for a proofing ICC profile. The
command option is specified using -sProofProfile=filename. With
this option, the color output will emulate what would be
obtained had the source file been rendered on a device defined
by the proofing profile. (See GS9_Color_Management.pdf for
details.)
- This release includes support for a device link ICC
profile. The command option is specified using
-sDeviceLinkProfile=filename. With this option, the device link
profile is added to the end of the link transform from source
to destination. In this case, one can include a command line
option like "-sDevice=tiff32nc -sOutputICCProfile=srgb.icc
-sDeviceLinkProfile=linkRGBtoCMYK.icc" and source colors will
be mapped through sRGB and through the device link profile to
CMYK values for the device.
- Ghostscript now supports "unmanaged color transformations" for
source DeviceXXX colors (in other words, they use a simple
conversion, rather than the ICC profile based color
workflow). This is beneficial in uses where performance takes
precedence over ultimate color fidelity (the command line
parameter -dUseFastColor enables this).
- The font set distributed with Ghostscript has been changed to
the standard 35 Postscript-compatible fonts distributed by URW.
- Ghostscript now includes a simple ink-coverage device,
contributed by Sebastian Kapfer (inkconv).
- The TIFF, JPEG and PNG output devices now support embedding of
the device ICC profile in the output file.
- Ghostscript now ships modified OpenJPEG sources for JPEG2000
decoding (replacing JasPer). Performance, reliability and
memory use whilst decoding JPX streams are all improved
- jbig2dec now has simple halftone region support
- The ps2write device has had a large number of output quality
and stability improvements.
description languages. Changes from 8.x series include:
- This release includes a move to an ICC-based color rendering
workflow. The design allows easy integration of 3rd party color
management modules (CMMs) and management of DeviceN and spot source
colors with ICC profiles as well as with non-ICC proprietary
methods. The default CMM is the well known littleCMS. Postscript
color objects and non-ICC CIE-based PDF color spaces are converted
to equivalent ICC profiles enabling complete color management for
all color spaces by an ICC-based CMM. New command line options
enable the specification of gray, rgb and cmyk default ICC profiles
as well as output device ICC profiles. The new work flow provides
performance improvements in the rendering of images, shadings and
transparencies. In addition, the color conversions are designed to
work efficiently in multithreaded display list (c-list) rendering
through the use of a shared link cache. Finally, proper ICC based
rendering now occurs for ALL XPS objects including Named colors,
N-Channel colors and images with internally embedded ICC profiles.
- The second major change in this release is that glyph rendering for
all font types except Type 3 is now handled by Freetype (via a much
improved and enhanced Font API). The most obvious benefit of this is
a complete, and proven implementation of the TrueType byte code
interpreter (now unencumbered by patents).
- Another major change is that the Postscript interpreter's graphics
state now stores two separate colour space settings for stroking and
filling, to better support the stroke and fill colours required by
the PDF interpreter.
- Support for optional content has been added to the PDF interpreter.
- This release also includes a number of improvements to the pdfwrite
device to improve reliability and quality with PCL and XPS
input. Many improvements to the support of JPX images in PDF files,
PDF annotation rendering and the usual number of general bug and
robustness fixes.
- For security reasons, Ghostscript no longer searches the current
directory by default. Use -P option to revert to old behavior.
- For monochrome devices, there is a new halftone technique for
sampled image data. The existing technique is very efficient (and is
is still used) for large areas of color, such as an area fill, but
encountered performance problems dealing with sampled image data
where a given colour value only covered a few pixels at a time. The
new approach applies the halftone threshold array directly to the
image samples.
- A new, robust CFF parser implemented in C (replacing the previous
Poscript one)
- tiffscaled device - this renders internally as tiffgray, but then
downsamples by an integer scale factor (specified by
-dDownScaleFactor=n) and error diffuses to 1bpp output. The
tiffscaled device also implements limited minimum feature size
functionality; by setting -dMinFeatureSize to 1, 2 or 3, the device
output is guaranteed to generate minimum dot sizes as multiples of
the final resolution, useful for devices that offer finer position
control than dot size control.
- Add DSC compatible output in ps2write.
