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graphics/jpeg,
IJGs jpeg compression utilities
Branch: CURRENT,
Version: 8b,
Package name: jpeg-8b,
Maintainer: pkgsrc-usersIndependent JPEG Group's free JPEG software
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This package contains C software to implement JPEG image encoding, decoding,
and transcoding. JPEG is a standardized compression method for full-color
and gray-scale images.
The distributed programs provide conversion between JPEG "JFIF" format and
image files in PBMPLUS PPM/PGM, GIF, BMP, and Targa file formats. The
core compression and decompression library can easily be reused in other
programs, such as image viewers. The package is highly portable C code;
we have tested it on many machines ranging from PCs to Crays.
We are releasing this software for both noncommercial and commercial use.
Companies are welcome to use it as the basis for JPEG-related products.
We do not ask a royalty, although we do ask for an acknowledgement in
product literature (see the README file in the distribution for details).
We hope to make this software industrial-quality --- although, as with
anything that's free, we offer no warranty and accept no liability.
For more information, contact jpeg-info@uc.ag.
Required to build:[
devel/libtool-base]
Master sites:
SHA1: 15dc1939ea1a5b9d09baea11cceb13ca59e4f9df
RMD160: 18d31a26c447564c258a6f6357e9002536c9ab96
Filesize: 942.505 KB
Version history: (Expand)
- (2010-05-19) Updated to version: jpeg-8b
- (2010-04-10) Updated to version: jpeg-8a
- (2010-01-20) Updated to version: jpeg-8nb1
- (2010-01-17) Updated to version: jpeg-8
- (2009-08-27) Updated to version: jpeg-7
- (2007-06-06) Updated to version: jpeg-6bnb4
CVS history: (Expand)
| 2010-08-05 13:29:10 by OBATA Akio | Files touched by this commit (1) |
Log message:
Replace DESCR from version depend README in distribution file
with http://www.ijg.org/files/README.
Noticed by PR#43701.
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2010-05-18 21:59:21 by Matthias Drochner | Files touched by this commit (2) |  |
Log message:
update to 8b
changes:
-Repair problem in new memory source manager with corrupt JPEG data
-Repair problem in Makefile.am test target
add "test" target
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2010-04-09 22:00:02 by Matthias Drochner | Files touched by this commit (2) |  |
Log message:
update to 8a
changes:
-Writing tables-only datastreams via jpeg_write_tables works again.
-Support 32-bit BMPs (RGB image with Alpha channel) for read in cjpeg.
-Improve accuracy in floating point IDCT calculation.
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| 2010-01-25 09:45:34 by Tobias Nygren | Files touched by this commit (1) |
Log message:
bump dependency again because linking was broken in a two day window.
|
| 2010-01-20 14:14:53 by Tobias Nygren | Files touched by this commit (1) |
Log message:
Pass --disable-ld-version-script to configure.
Specifying a version script that doesn't contain anything is pointless,
and seems to trigger toolchain bugs on DragonFlyBSD (PR pkg/42639).
Bump revision.
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| 2010-01-17 19:41:54 by Tobias Nygren | Files touched by this commit (1) |
Log message:
library major was bumped again. (sigh)
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2010-01-17 12:53:40 by Thomas Klausner | Files touched by this commit (2) |  |
Log message:
Update to 8:
The current version is release 8 of 10-Jan-2010. Version 8 of the
JPEG software introduces basic new features for image coding
application and comes with an essential update of the original JPEG
specification.
New features and enhancements have been developed for the three
major parts of the IJG library: the compression, the decompression,
and the transcoding parts. These parts are represented by the three
major tools of the IJG software: cjpeg (compress JPEG), djpeg
(decompress JPEG), and jpegtran (transcode JPEG - lossless): IJG
Tools New jpegtran -scale lossless resize feature
A new option has been added to the jpegtran tool and transcoding
library:
-scale M/N Scale output image by fraction M/N, eg, 1/8
Currently supported scale factors are M/N with all M from 1 to 16,
where N is the source DCT size, which is 8 for baseline JPEG. If
the /N part is omitted, then M specifies the DCT scaled size to be
applied on the given input. For baseline JPEG this is equivalent
to M/8 scaling, since the source DCT size for baseline JPEG is 8.
CAUTION: An implementation of the JPEG SmartScale extension is
required for this feature. SmartScale enabled JPEG is not yet widely
implemented, so many decoders will be unable to view a SmartScale
extended JPEG file at all.
New djpeg -scale feature
The -scale option of the djpeg tool and decompression library has
been extended:
-scale M/N Scale output image by fraction M/N, eg, 1/8
Currently supported scale factors are M/N with all M from 1 to 16,
where N is the source DCT size, which is 8 for baseline JPEG. If
the /N part is omitted, then M specifies the DCT scaled size to be
applied on the given input. For baseline JPEG this is equivalent
to M/8 scaling, since the source DCT size for baseline JPEG is 8.
New cjpeg features
Two new features have been added to the cjpeg tool and compression
library:
-quality N[,...] Compression quality (0..100; 5-95 is
useful range) -scale M/N Scale image by fraction M/N,
eg, 1/2
The -quality option has been extended for support of separate
quality settings for luminance and chrominance (or in general, for
every provided quantization table slot). This feature is useful
for high-quality applications which cannot accept the damage of
color data by coarse subsampling settings. You can now easily reduce
the color data amount more smoothly with finer control without
separate subsampling. The resulting file is fully compliant with
standard JPEG decoders.
A new -scale option is provided with cjpeg which complements the
corresponding djpeg -scale option. The supported range of scaling
factors is 8/N with all N=1...16. This means you can now easily
alter the nominal spatial resolution of a given source image while
compressing to JPEG without additional resampling. For example,
if you have an image sensor providing an effective capture resolution
of 2268x1512 pixels (HI resolution), you can now directly generate
a MED resolution of 1512x1008 pixels (-scale 2/3) and a LOW resolution
of 1134x756 pixels (-scale 1/2) from the sensor source resolution
with the library while compressing to JPEG without additional
resampling. (An efficient 12x12 FDCT is used in the -scale 2/3
case, and an efficient 16x16 FDCT is used in the -scale 1/2 case
instead of the standard 8x8 FDCT inside the library, ensuring
high-quality downscaled results - the resulting file is fully
compliant with standard JPEG decoders.)
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| 2010-01-04 20:43:40 by Joerg Sonnenberger | Files touched by this commit (5) |
Log message:
Make sure that the patches and local files have a RCS ID.
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