"Science" article on SLAC
This is a test of scanned newspaper
cuttings on the web. The test article
has a few columns of text and a colour
photo. Both "xv" and the NeXTStep
"Preview" seem to understand the
TIFF compression OK. All the scanning
was originally done in TIFF using
Ofoto on a Mac with a 300dpi greyscale
scanner.
The Text
Here is the picture in black & white
of the article (picture included)
in TIFF (LZH compression) (space
232 kb). This is the original file.
Below is the picture in black & white
of the bottom half of the article (so it is just text). The quality
in scanning is: resolution 300*300
dpi, threshold 100 (out of 256), in different formats (and
compressions for TIFF). The best choice, as for
minimum disk space, is
TIFF (CCITT4 compression) (space
81 kb).
The photo
This is the picture in grey scale
of the photo inside the article.
The best quality in scanning is:
resolution 300*300dpi, grey scale
on 8 bits.
The best choice, as for
minimum disk space, is
JPEG at "75%" quality (space 283 kB)
Below are different formats (and
compressions for TIFF).
Other testings on the same article
Here are tests on different grey
scales and resolutions. They are
all TIFF (LZH compression).
Here are tests on different thresholds
and resolutions. They are all TIFF
(LZH compression).
Here are tests on different thresholds
and resolutions. They are all TIFF
(LZH compression).
Here is the picture in black & white
of the article ( picture included
, which should weaken the compression
of ccitt3 and ccitt4). The resolution is poor,
reduced to screen quality (about 80 dpi).
Please, send any comments to me (e-mail
secret@dxcern.cern.ch): bugs, better
compressions, scanners, time...
AS
