Table of Contents
zimg - render 2d data of arbitrary
format
- zimg [options] [file ...]
The zimg program generates
png images from arbitrary formatted 2-D ascii or binary data.
If no input files are given, zimg reads from stdin.
If the input file ends
in .gz, .bz2, .z or .Z and your operating system supports the popen() call,
the file is filtered through gunzip, bunzip2 or uncompress respectively.
If an input file is not accessible, the availability of the file with
the suffixes .gz, .bz2, .z or .Z appended is checked (multiview).
If no command
line options are specified, zimg assumes plain ascii input, where the dimensions
of the image are taken from the first two convertable integers and comment
lines are marked by a hash `#' mark at the very first column of each line.
If ascii data is read the first lines are parsed for zimg modelines until
the first data point is read. See below in the section MODELINES.
Currently
the `ESRF data format' (edf and ehf) is the only binary input format which
is detected automatically by zimg (if this option was not disabled at compile
time). In the case of ehf, the data is read from a different file as specified
by the tag EDF_BinaryFileName.
If the size was not specified and no binary
option was selected, the first bytes of the source file are examined to
check if the source is already a png file. This works only on systems where
there's no difference between reading ascii and binary data (UNIX). If the
source file is a png, all options except the colormap, labelling and output
options are ignored. This is mainly useful for labelling a png file later
(or a png file that was not created by zimg). It can also be used to just
convert png to jpeg. Or you can specify a different colormap, to change
the colormap entries of the source png. Note that this check for source
png's is not available if zimg was linked with an older libgd version. If
the source is a png, the --dump-colormap switch dumps the colormap entries
of the png file instead of the zimg colors.
In almost all cases
you'll need to specify at least a few command line options to tell zimg
something about the input format and specify the output style.
Note, that
the order of command line options is important: in the case of mutually
exclusive options the last one wins; in the case of a switch which turns
an option on, a second occurence of this switch turns the option off again.
Example: -x -x does nothing. This is useful for overwriting options which
were set in the resource files ~/.zimgrc and .zimgrc (see section FILES).
If an options overwrites another option (e.g. in `--red --blue', the second switch
would overwrite the first), this is silently ignored.
Some switches can
be defined more than once and are position dependent. These switches include
--differentiate
--curvature
--smooth
--logarithmic
--fabs
--absolute
--relative
This means that in
zimg --relative=10-60 --differentiate
the relative scaling applies to the raw data, but in
zimg --differentiate --relative=10-60
the relative scaling applies to the differentiated data.
Spaces separating
the single-letter options from their parameters are optional.
The availability
of some options are compile-time dependent. Use the --help option to get a
list of valid options for your binary version of zimg.
- -r, --size=width[,height]
- specifies the width and height of the 2-D data. If height is not given it
is set equal to width. The separator 'x' (instead of ',') can be used also for
backwards compatibility.
- -p, --pattern=pattern
- Mark comment blocks. This
option is used when reading unformatted ascii data. Each line will be truncated
at pattern. This options might be used repeatedly to specify more than
one comment pattern. This option was not really tested and might be still
buggy. For the future it is planned to include also regular expressions.
- -n, --column=number
- read column number (ascii input). Multiple columns can
be selected by using this option repeatedly. Currently this is limited
to the 32 first columns. If number is omitted, the data of all columns
will be used.
- --skip[=bytes/lines]
- skip this amount of lines when reading
ascii data. Skip bytes, if reading binary data. Note that the unit is bytes,
irrespective of the input type (short ..). If the optional size argument is
missing, the option is reset to its default. This default behavior is as
follows: for binary data, all available data is read from the input stream
and the header size (which will be skipped) is then calculated as the difference
between the size of input data and the size of the image as specified by
the -r switch. Or in short: the last <width>x<height> items of the input stream
will be taken. If you don't like this feature you can disable it explicitly
by using the switch `--skip=0'. For ascii data no skipping will be done by default.
- --options=/regexp/switches
- apply switches, if the input filename matches
regexp. Especially useful if used in a .zimgrc file. The separator character
can be any character which is not present in regexp, for example --options=#/usr/local#switches.
See also the --input-filter switch. --options is only available if your system
provides the POSIX regular expression functions regcomp / regexec (check
zimg -V for availability).
- --input-filter=filter
- filter input files thru filter.
If filter contains a %s, it is substituted with the file name, else the
filename is appended to the filter. This switch is especially useful if
used in a .zimgrc file. Example: --options='/.int$/--input-filter=int < %s'. See also
the --options switch. --input-filter is only available if your system supports
the popen() call (check zimg -V for availability).
- -o, --output=path
- normally
zimg writes to stdout. You don't ever need this option, if you redirect stdout
to you destination file or pipe. If more than one input file is given, path
should be an existing directory where the output files should be stored.
In this case the output names are constructed from path, the input file
name and a suffix ".gif" or ".png" / ".jpg" depending on the gd version which
was used at compile time (and eventually the -j switch)
- --big-endian
- binary
input data is big-endian. This option overwrites --swap and can be overwritten
by --swap and --little-endian. This switch does nothing if the machine where
zimg runs is also big-endian, otherwise the words get swapped.
- --little-endian
- binary input data is little-endian. This option is the opposite of big-endian,
overwrites --swap and can be overwritten by --swap and --big-endian. This switch
does nothing if the machine where zimg runs is also little-endian, otherwise
the words get swapped.
- --swap
- swap bytes when reading binary input. This might
be necessary when using binary files from different platforms. If zimg runs
on a little-endian machine (e.g. Intel) --swap assumes the binary input data
created by a big-endian machine and vice versa. All three switches --swap,
--big-endian and --little-endian overwrite each other and therefore it is recommended
to use only one of these switches.
- -f, --float
- read binary float (normally
4 bytes) data.
- -d, --double
- read binary double (normally 8 bytes) data.
- --char
- read signed char data.
- --short
- read signed short data.
- --int
- read signed int
data.
- --long-int
- read signed long-int data.
- -c, --unsigned-char
- read unsigned char
data.
- -s, --unsigned-short
- read unsigned short data.
- -i, --unsigned-int
- read unsigned
int data.
- --unsigned-long-int
- read unsigned long int data.
- --complex-float[=(abs/length|phase|real|imaginary)]
- input data is binary complex float. (ascii parsing of complex numbers is
not implemented yet. The value of the switch determines how to display the
complex numbers. The default is abs or the alias length (the length of the
complex number).
- --complex-double=(abs/length|phase|real|imaginary)
- Like --complex-float,
but for complex double binary input data.
- --red
- use a red scale color map.
- --blue
- use a blue scale color map.
- --grey, --gray
- use a grey scale color map.
- -m, --colormap[=path]
- use custom colormap from the file path. The file must
hold r g b triplets with values ranging from 0 to 0xff (255). There must
be exactly one triplet per line, where empty lines and lines beginning
with a hash `#' mark are skipped. The maximum number of columns is defined
in zimg.h and currently 240 (16 colors are reserved for "LINE COLORS"). The
colormap file is searched in the current directory, then in ~/.zimg/cmap,
then in /usr/share/zimg/cmap. If the optional argument number is omitted,
the colormap is reset to the default.
- -m, --colormap[=red[,green[,blue]]]
- create a colormap using predefined colormap formulae. red, green and blue
must be integers between -36 and 36. If blue and/or green are missing, they're
set to green or red respectively (so a gray colormap value can be created
by specifying red only). The numbers select one of the predefined formulae
which are used to map the z value to a color intensity. Negative numbers
invert the color intensity. Currently the following formulae are defined
where x ranges from [0, 1]: If the optional argument number is omitted,
the colormap is reset to the default.
0 x = 0
1 x = 0.5
2 x = 1
3 x = x (identity)
4 x = x * x
5 x = x * x * x
6 x = x * x * x * x
7 x = sqrt(x)
8 x = sqrt(sqrt(x))
9 x = sin(90 * x)
10 x = cos(90 * x)
11 x = fabs(x - 0.5);
12 x = (2 * x - 1) * (2 * x - 1);
13 x = sin(180 * x);
14 x = fabs(cos(180 * x));
15 x = sin(360 * x);
16 x = cos(360 * x);
17 x = fabs(sin(360 * x));
18 x = fabs(cos(360 * x));
19 x = fabs(sin(720 * x));
20 x = fabs(cos(720 * x));
21 x = 3 * x;
22 x = 3 * x - 1;
23 x = 3 * x - 2;
24 x = fabs(3 * x - 1);
25 x = fabs(3 * x - 2);
26 x = (1.5 * x - 0.5);
27 x = (1.5 * x - 1.0);
28 x = fabs(1.5 * x - 0.5);
29 x = fabs(1.5 * x - 1.0);
30
if (x <= 0.25)
return 0;
if (x >= 0.57)
return 1;
x = x / 0.32 - 0.78125;
31
if (x <= 0.42)
return 0;
if (x >= 0.92)
return 1;
x = 2 * x - 0.84;
32
if (x <= 0.42)
x *= 4;
else
x = (x <= 0.92) ? -2 * x + 1.84 : x / 0.08 - 11.5;
33
x = fabs(2 * x - 0.5);
34
x = 2 * x;
35
x = 2 * x - 0.5;
36
x = 2 * x - 1;
- -b, --cbox, --colorbox[=n]
- draw a labelled colorbox right to the image. If
the number of labels n isn't given, it is calculated automatically according
to the image and font heights. Labelling can be turned off by specifying
--colorbox=0.
- --cbox-fmt, --cbox-format=format
- format is a c sprintf format string
for floats, e.g. %3.6g (see the sprintf(3)
manual), which is used for formatting
the colorbox legend. Turns on --cbox implicitely.
- --cbox-label=string
- Print string
next to the colorbox (e.g. a unit for the colorbox numbers). Turns on --cbox
implicitely. string can be a multiline string, see for example the --label
switch.
- --dump-colormap
- dump a colormap to stdout as it can be read back with
the -m switch. This can be useful for manually editing and reading back the
colormap. The --dump-colormap switch disables most of the other switches -- no
processing of data files is done. The only exception is if the source files
are png files: in this case not the (specified) colormap of zimg, but the
color entries of the source png are dumped.
- -I, --invert
- invert the selected
color map.
- -x, --xor[=color]
- do an exclusive or with the specified color (defaults
to white). For the gray scale color map this equivalent to the --invert switch.
- --differentiate
- apply a discrete differentiation (1'st derivative) to the
data. This is a position dependent switch
- -u, --curvature
- display the curvature
(2'nd derivative) of the data. This is a position dependent switch
- --smooth[=sigma]
- wipe out hot spots. The average and sigma of the nearest neighbors of each
pixel are calculated. If the pixel's value is greater than (`threshold' * sigma
+ average), it will be set to the average of the neighbors. This is a position
dependent switch
- -l, --logarithmic[=scale]
- use a logarithmic color scale
where scale must be strictly positive. The data is scaled to the range 0
- scale, then the log1p () is taken. The default for scale is 1. The best
way to understand this is to compare the results for different scale values.
This is a position dependent switch
- -a, --fabs
- take the absolute value of
the input data. The long option --fabs was named after the c function fabs(),
because the --absolute switch is used for absolute scaling (see below). This
is a position dependent switch
- --absolute=min,max
- set everything below min
to min and every thing above max to max. The partial notations --abs=min,
and --abs=,max can be used. If both min and max are given, a - can be used
as separator instead of the ,. This is a position dependent switch
- --relative=min,max
- same as above, but min and max are to be given relative (in percent) to
the data's min and max. This is a position dependent switch
- -N, --no-data, --nda=[val|@percent[,color]]
- set data points which are equal to val to the color color (default: black).
If val isn't specified, or if @percent is specified instead of val, the
nda value is determined automatically from the border values: The border
value which occurs most frequently will be the NDA value. The value @percent
if given, must be 0 < @percent <= 100. If @percent > 1 it is divided by 100,
so @75 is equivalent to @0.75. The @percent value gives the fraction of nda
border values compared to the number of border pixels which must be reached
at least for the automatically determined nda value to be valid. Example:
suppose your image is 100 x 200 pixels large, so the number of border pixels
is 600 - 2 = 598. If you specify --nda=@.75 and the most frequent border value
occurs 350 times, the nda feature won't be applied, since 350 is smaller
than 0.75 * 598.
- -e, --expr=string
- filter data through the c-style string expression
string. This feature is compile-time dependent and only available, if zimg
-V shows the string dynaload. The expression string string will be compiled
on the fly by "gcc -c -O3 -shared -o". The expression is wrapped in a function
which will be called for each data value z (double) with the current x
(unsigned int), width (unsigned int) and y (unsigned int), height (unsigned
int) values supplied. Example:
# zimg -e "cos(z) - (width - x)" ...
- -R, --expr-source=file.c
- Use file.c as input file name for compiling the expression.
If the switch --expr is not given, --expr-source should point to an existing
file which holds the c source for the expression function. If the switch
--expr is given, it will be wrapped in a c function and stored in the file.c
given by --expr-source. If --expr-source is not given, the expression given by
--expr will be stored in a temporary c-file which will be deleted after the
expression evaluation.
The switch --expr-source can be used for reusing the
expression source:
# zimg -e "cos(z) - (width - x)" -R myfunc.c
# zimg -R myfunc.c ... file.dat
- -O, --expr-object=file.so
- Use file.so as output file name for compiling the
expression. If none of the switches --expr and --expr-source is given, file.so
should exist and be a valid object file which was probably compiled before
by zimg. Shared objects are searched in the current directory, then in the
directory ~/.zimg/expr, then in /usr/lib/zimg/expr and then in the search
path of your dynamic loader (refer to the manual pages of dlopen() or shl_load(),
depending on the implementation). If --expr-object is not given, the expression
given by --expr or --expr-source will be compiled to a temporary shared object
file which will be deleted after the expression evaluation.
If at least
one of the switches --expr or --expr-source are given, the expression will be
compiled to file.so. This can be used for compiling a shared object file
for later use:
# zimg -e "cos(z) - (width - x)" -O myfunc.so
# zimg -O myfunc.so ... file.dat
For complicated expressions it might be useful to create the c-source for
the expression with an editor and compile it 'by hand'. Please refer to the
manual page of your c-compiler for how to create shared object files (for
gcc it is the switch -shared). The shared object must export a function zimg_expression
with the zimg_expression_t as given in zimg.h. Example:
#include <zimg.h>
float
zimg_expression(unsigned int x, unsigned int y,
float z, const zimg_expression_info_t* info)
{
unsigned int height = info->height;
return z - (float)x * (float)(height - y);
}
- -S, --scale=xy
- -S, --scale=x,y
- Scaling of the image. If only one numer is given,
it is use for both directions. Any non-numeric character may be used as separator.
The factors should be greater 1. SCALING IS STILL EXPERIMENTAL.
- -C, --crop[=left-rightxtop-bottom]
- crop the raw data to the specified size. Note
that the numbers given apply to the raw data, not to the eventually enlarged
or binned image. If the optional argument is omitted, the data is cropped
automatically: all data with the same value as the border is cropped.
- -A,
--align=horizontal[xvertical][,bordercolor]
- align to an integer multiple
of the specified pixels. If vertical is omitted, it it set to horizontal.
Example: -A16 will pad the resulting image so that it's (both) dimensions
are multiples of 16. This is useful, if the images are used to create an
mpeg sequence for example (otherwise mpeg_encode will cut the images down
so that the dimensions are multiples of 16). The data is centered within
the resulting image. The optional argument bordercolor must be given as
6-digit hexadecimal number, where the first digits are the red value, the
second two digits the green value and the last two digits the blue value
(so the color values for each color are between 0 and ff). Note that zimg
will try to choose a color out of the existing color map which comes close
to what you've specified, but depending on the color map you might not get
exactly what you've requested. See also the --textcolor switch. If the bordercolor
is not given, the image border color is chosen to be the most frequent
color of the original data's border.
- --contours=levels[,log][,bg=color|fg=color]
- draw contour lines. This option is still experimental. Optional arguments
are probably subject to future changes. The optional argument `log' distributes
the contour levels logarithmically over the image. The optional argument
bg=color forces contour-only drawing i.e. colors the background with the specified
color. This color must be give as 3 or 6 digit hex value or the special
keyword 'black'. fg=color uses the specified color as contour line color. bg
and fg and should not used together. The contour algorithm is pretty fast
and does not spline when enlarging the image.
- --interlace
- write an interlaced
image. --interlace is off by default. If you write a jpeg image using the --jpeg
switch, the --interlace switch will be interpreted to write a progressive
JPEG.
- -j, --jpeg[=quality]
- write a jpeg instead of a png image. quality must
be an integer number between (inclusive) 0 and 100. If quality is omitted,
an appropriate default quality is used. Jpeg is only available, if zimg
was compiled with libgd >= 1.8. If you have set image interlacing using the
--interlace switch, this switch is interpreted to write a progressive JPEG.
Some programs (e.g., Web browsers) can display progressive JPEGs incrementally;
this can be useful when browsing over a relatively slow communications
link, for example. Progressive JPEGs can also be slightly smaller than
sequential (non-progressive) JPEGs.
- -t, --label=[+-]x[+-]y,string
- print string
at the specified position of the FINAL image. 'Final' means the image size
with all padding and scaling applied. The string can be a multiline string
separated by '\n', e.g. "this\nis\nmultiline\ntext". x and y can be negative coordinates,
in which case they're interpreted as offsets of the right and bottom text
bounding box from the right and bottom border of the image respectively.
If you specify for example --label=-1-1,string, the string is entirely visible,
having the lower right border of it's bounding box in the bottom right corner
on the image. Long multiline strings should preferably be passed by specifying
this option several times (e.g. for each line separately) because of limitations
of the option parser. See also STRING ESCAPES.
- --vlabel=[+-]x[+-]y,string
- same
as the --label option, but prints the string vertically. See also STRING ESCAPES.
- --legend=string
- print string outside the image region black on white.
The legend is either placed right or bottom of the image depending on the
ratio of the resulting total image (smaller ratio wins). The string can
be a multiline string separated by '\n', e.g. "this\nis\nmultiline\ntext". The extra
space needed for the legend is reserved automatically. Long multiline strings
should preferably be passed by specifying this option several times (e.g.
for each line separately) because of limitations of the option parser. The
string can be reset to zero length (e.g. for multifile input together with
modelines) by using --legend w/o string argument. See also STRING ESCAPES.
- -F, --font=integer
- font size. Must be between (inclusive) 1 and 4. If the font
size is not specified, it is chosen according to the image dimensions:
a larger image gets a larger font size.
- -T, --textcolor=xxxxxx
- The xxxxxx
must be given as 6-digit or 3-digit hexadecimal number, where the first digit(s)
are the red value, the second two digit(s) the green value and the last
two digit(s) the blue value (so the color values for each color are between
0 and ff). Note that zimg will try to choose a color out of the existing
color map which comes close to what you've specified, but depending on the
color map you might not get exactly what you've requested. Alternatively
the color can be also specified by one of the predefined color names, see
the section "LINE COLORS". If the text color is not given, it will be chosen
automatically and should give normally a high contrast.
- --line=[+-]x1[+-]y1[+-]x2[+-]y2[...]
- draw a line or polyline from x1, y1 to x2, y2 (and more vertices) on the
FINAL image. 'Final' means the image size with all padding and scaling applied.
Example --line=+10+10+10+20 draws a horizontal line. All coordinates are
absolute. Negative coordinates are interpreted from the right and bottom
border respectively.
- --rline=[+-]x1[+-]y1[+-]x2[+-]y2[...]
- same as --line, but all
coordinates except x1 and x2 are interpreted relatively to x1 and x2.
- -L,
--license
- Display some license information. zimg is published under the terms
of a BSD type License.
- -V, --version
- Prints a version identifier for zimg
to standard error. This is guaranteed to always contain the string "zimg"
and the version number. Additionally the string "png" or "gif" indicates
the output format which depends on the gd driver which was compiled in.
Compile time options as edf support are appended in brackets.
- -v, --verbose
- switch on some informational output. Might not be too useful.
- --statistics
- print histogram like statistics of the processed data to stderr.
- --help
- Prints
a help message to stderr and dies.
The switches --label, --vlabel
and --legend accept some string escapes. The replacement of these string escape
takes place after the data has been read and processed. String escape start
with a percent sign '%' followed by a single character which indicates the
type of the substitution. The following string escapes are supported:
- %c
- Current time in RFC822-conformant format.
- %f
- The filename of the input file
- %m
- The minimum of the processed data.
- %M
- The maximum of the processed
data.
- %i
- The integral of the processed data (valid data points only, see
also the --no-data switch).
- %{...}
- Will be substituted with the standard output
of the shell command which is given between the opening { and the closing
}.
Some of the switches accept a color specification, e.g. --no-data,
--align, --contours, --textcolor and --xor. These "line colors" are not choosen
from the colormap which is used for rendering the data. Line colors can
be specified either as 6-digit or 3-digit hex value or as one of the predefined
strings "black", "white", "red", "green", "blue", "magenta", "cyan", "yellow".
In the case of a 6-digit hex value, the first two digits represent the red
value, the second two digits the green value and the last two digits the
blue value. In the case of a 3-digit hex value, the first digit represent
the red value, the second digit the green value and the last digit the
blue value.
If the input data is ascii (or at least the header
is ascii), zimg looks for modelines like some versions of vi or vim do.
This is done only until the first data point is read. The format for modelines
is as follows:
<space>zimg:<zimg options>:
You can have multiple modelines and even use a modeline to switch to binary
input. Example:
#!/usr/bin/zimg
# zimg: -l10 -C50-550x200-450:
# zimg: -m7,5,15 -t -r547x633 -s --swap:
...
Note that in this case the order is important. Everything after the line
containing the -s (unsigned short binary) is considered as binary data. So
exchanging the two modelines like in the next example would interpret the
second modeline as binary data (which is probably not what you want):
#!/usr/bin/zimg
# zimg: -m7,5,15 -t -r547x633 -s --swap:
# zimg: -l10 -C50-550x200-450:
...
- zimg my.dat > my.png
- This one of the most simple examples. The
file my.dat is assumed to hold the dimensions of your 2-D data as the first
two convertable integers. Everything before the first convertable integer
is silently skipped, so it is also valid to have the dimension specifiers
after a comment (hash) mark like this:
# 128 128
45.12
76.70
...
- my.dat > my.png
- If your operating system supports the specification of an
interpreter by preceding it with #! you can make your data file an executable
like this (you probably have also to change the permissions of my.dat e.g.
`chmod +x my.dat' on UNIX):
#!/usr/bin/zimg
# 128 128
# zimg:--red:
45.12
76.70
...
- zimg my.dat.gz | xv -
- pipe the output of zimg directly to your favorite image
viewer (here: xv). The file will be filtered by gunzip.
- zimg --red -r1200x1200
--skip=2400 -S1/2 -s l408_01.image | xv -
- read binary data which hold 1200 x 1200
unsigned short data values. Skip the first 2400 bytes. Use the red scale
color map. Scale the image down to 600 x 600 pixels and pipe it to xv.
Note
that the skip option is not really necessary as long as the data is located
at the very end of the input file. In this case the header size would be
calculated by zimg.
- zimg my.png --xlabel=10,10,'love is like oxygen' --jpeg > my.jpg
- read the png as source image, apply a label and write it as jpeg.
- zimg
for displaying function expressions w/o input data
First you've to create
the c source which holds the function expression, for example sinc.c:
#include <zimg.h>
#include <math.h>
float
zimg_expression(unsigned int x, unsigned int y,
float z, const zimg_expression_info_t* info)
{
double width = (double)info->width;
double height = (double)info->height;
double xd = (double)x - width * 0.5;
double yd = (double)y - height * 0.5;
double value;
xd *= 10 / width;
yd *= 10 / height;
value = sqrt(xd*xd+yd*yd);
return value ? sin(value) / value : 1
}
This expression can be displayed w/o any data file by using /dev/zero as
input source. As the input data is not used at all, you can use the -c switch
-- tell zimg to treat the input as bytes. Furthermore you've to specify the
dimension of the image with the -r switch:
# zimg -c -r300 --skip=0 -Rsinc.c -Osinc.so < /dev/zero | xv -
The object file sinc.so can now be reused in subsequent zimg runs, e.g.
# zimg -c -r500 --skip=0 -Osinc.so < /dev/zero | xv -
Note, that you've to tell zimg explicitely not to skip the file header,
otherwise it will read from /dev/zero infinitely as it thinks it's the data
header.
- HOME
- When this variable is found,
zimg looks there for a file with the name .zimgrc which may contain command
line options. If expression evaluation support is compiled in, object files
are searched in the directory $HOME/.zimg/expr/.
- ZIMG_VIEWER
- used to view
stdout, if zimg detects that stdout goes to a terminal (which is probably
not what you want). Defaults to "xv -".
the .zimgrc file in the HOME
and the current directory are read in this order. These files are read
before command line parsing is done, so command line options given on the
command line will eventually overwrite previously defined settings of the
resource files.
The .zimgrc files in the HOME and the current working directory
might contain command line options separated by any white spaces including
newlines. Blank lines and everything behind a hash `#' mark is considered
to be a comment.
probably.
The official zimg web site at:
http://zimg.sourceforge.net/
Johannes Zellner <johannes@zellner.org>
This version of zimg was originally derived from the program z2ppm
which was able to write portable pixmap (ppm) files.
- Thomas Boutell
<boutell@boutell.com>, the author of the gd driver.
- Petr Mikulik's <mikulik@physics.muni.cz>
for the color code
- (getcolor.c, see also http://www.sci.muni.cz/~mikulik/gnuplot.html)
and the OS/2 port
- Levente Novak <novak@jaguar.dote.hu> for the DOS/DJGPP port.
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