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RasMol and Chime FAQ (Frequently Asked Questions) - B
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(Continued from previous part...)
Printing in High Resolution
If you select "File, Print" from RasMol's menus, the image
will be printed at screen resolution. This will appear jagged and of
poor quality since most inkjet or laserjet printers print at least 300
dots/inch (120 per cm), while even at 1024 pixels wide by 768 pixels
high, a 15-inch (38-cm) screen has less than 100 dpi (40 dpc). Below are
outlined several alternative strategies for printing high-resolution
images.
One solution is to use the highest screen resolution available to
you (perhaps 1280 x 1024), and resize RasMol's graphics window to
full-screen. Particularly if you print the result at less than
screen-size (e.g. in portrait rather than landscape mode and/or
xerographically reduce the image), it may have acceptable resolution. A
similar result will be achieved if you select "Export, GIF"
from RasMol's menus and save an image file (same resolution as screen).
Such a GIF file can be used on a web page or printed with a shareware
graphics editor such as LviewPro for Windows
(what is good for Macs?). LviewPro is also good for combining several
RasMol images, annotating them with good-looking text, cropping,
changing the background color or making the background transparent
(save as GIF89a), etc.
If you have a postscript printer, the RasMol command write vectps
filename creates a postscript file at printer resolution, which can
then be sent to your printer. (This command is not on RasMol's Export
menu nor is it documented in the on-line help. The command write ps
filename writes raster postscript at screen resolution.) The
disadvantage of vector postscript is that at present it does not
support ribbons, cartoons, strands, or traces. Note that the set
vectps on command adds outlines to cylinder bonds or spheres.
However, it presently does not work for spheres intersecting more than
one other sphere. Thus, it works well for stick or ball-and-stick
images but not for most spacefilling images.
A final solution is to recompile RasMol's source code after inserting
modifications which facilitate making higher-resolution images. Details
can be found by searching for "resolution" in the
RasMol email discussion history for January, March and July 1996.
How do I see RasMol's stereo pairs in 3D?
See Gale Rhodes' excellent guide to viewing stereo image pairs,
Stereo Viewing.
Modifying existing PDB files
Would you like to remove or extract
some of the atoms from a PDB file? Both RasMol
and WebLab can do this, but each with some limitations.
Details are provided under PDB Tools.
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