Read bitmapped images.
The main purpose is to pick up data points from scanned diagrams
The specified file is read and interpreted as a bitmapped graphic picture.
A subsequent GDISP displays the picture and allows to define the x- and y-axis
using a cursor rectangle.
You have to explicitly specify the lower and upper limits as well as linear or log scale.
Once the axes are completely defined you can apply other gd commands for further processing
GDISP / XMIN(0) XMAX(10) YMIN(1) YMAX(100) YLO
GPOS / LOOP
reads the image data, defines the x- and y-axis (log).
With GPOS data points can be picked up and their coordinates
are saved to file.gd
Name of a bitmapped graphics file. The particular format is determined
from the file name extension. Currently supported are:
.iff Amiga IFF-ILBM (big-endian systems only)
.xbm X11 bitmap (UNIX systems only)