g3data (1) General Commands Manual g3data (1)
NAME
g3data -- A tool for extracting data from graphs.
SYNOPSIS
g3data [-max x y] [-scale factor] [-coords llx lly rux ruy] [-errors] [-lnx] [-lny] [filename(s) ...]
DESCRIPTION
2001-01-01;
g3data is a tool for extracting data from scanned graphs. For graphs published in scientific articles the actual data is usually not
explicitly given ; g3data makes the process of extracting this data easy.
OPTIONS -max x y If picture is larger x-wise than x or y-wise than y, the picture is scaled down accordingly otherwise this parameter has no
effect.
-scale factor
Scales the picture size by factor. This parameter nullifies effect of the -max parameter.
-coords llx lly rux ruy
Preset the coordinates of the left lower (ll) corner and the right upper (ru) corner.
-errors Print out the error of the x value in column 3 and the error of y value in column 4 of the output.
-lnx Use logarithmic scale for x coordinates.
-lny Use logarithmic scale for y coordinates.
filename(s) ...
The filename(s) of the image(s) to open. Supported image formats: PNG, XPM, JPEG, TIFF, PNM, RAS, BMP and GIF.
USAGE
g3data -scale 2 -errors test1.png
g3data -scale 2 -lny -errors test2.png
BUGS
None known.
AUTHOR
Jonas Frantz jonas.frantz@welho.com
g3data (1)
Check Out this Related Man Page
pamstretch(1) General Commands Manual pamstretch(1)NAME
pamstretch - scale up a PNM or PAM image by interpolating between pixels
SYNOPSIS
pamstretch [-xscale=X] [-yscale=Y]
[-blackedge] [-dropedge] N [infile]
You can use the minimum unique abbreviation of the options. You can use two hyphens instead of one. You can separate an option name from
its value with white space instead of an equals sign.
DESCRIPTION
pamstretch scales up pictures by integer values, either vertically, horizontally, or both. pamstretch differs from pnmscale and pnmenlarge
in that when it inserts the additional rows and columns, instead of making the new row or column a copy of its neighbor, pamstretch makes
the new row or column an interpolation between its neighbors. In some images, this produces better looking output.
To scale up to non-integer pixel sizes, e.g. 2.5, try pamstretch-gen(1) instead.
Options let you select alternative methods of dealing with the right/bottom edges of the picture. Since the interpolation is done between
the top-left corners of the scaled-up pixels, it's not obvious what to do with the right/bottom edges. The default behaviour is to scale
those up without interpolation (more precisely, the right edge is only interpolated vertically, and the bottom edge is only interpolated
horizontally), but there are two other possibilities, selected by the blackedge and dropedge options.
PARAMETERS
The N parameter is the scale factor. It is valid only if you don't specify -xscale or -yscale. In that case, pamstretch scales in both
dimensions and by the scale factor N.
OPTIONS -xscale=X
This is the horizontal scale factor. If you don't specify this, but do specify a vertical scale factor, the horizontal scale factor
is 1.
-yscale=Y
This is the vertical scale factor. If you don't specify this, but do specify a horizontal scale factor, the vertical scale factor
is 1.
-blackedge
interpolate to black at right/bottom edges.
-dropedge
drop one (source) pixel at right/bottom edges. This is arguably more logical than the default behaviour, but it means producing out-
put which is a slightly odd size.
BUGS
Usually produces fairly ugly output for PBMs. For most PBM input you'll probably want to reduce the `noise' first using something like
pnmnlfilt(1).
SEE ALSO pamstretch-gen(1), pnmenlarge(1), pnmscale(1), pnmnlfilt(1)AUTHOR
Russell Marks (russell.marks@ntlworld.com).
11 November 2001 pamstretch(1)