plot with image question

[Mark S. <ma...@sc...>]

Hi all!

Recently I discovered the 4.1 version of gnuplot and the image 
plotting facilities. Without knowing, I was waiting for this. A big 
thank you guys!

My question: If I plot an image now I get the pixel numbers along the 
X and Y axis. Is it possible to supply values for the X and Y axis 
(thus besides the image). Or is it possible the give an expression 
for the X and Y axis. Instead pixel numbers I want to give 
micrometers as the images are microscopic of nature. Can be done by 
another datafile with X and Y values, or by an expression, let say 
X*(MicroMeterPerPixelValue) for the X axis.

Your ideas are appreciated!

P.S. There is no such thing as a mubar functionality in gnuplot, is 
there? I mean a little line onto the image indicating a specified 
amount of distance. Of course I can program this directly into the 
image by making a line of pixels black (or white), but if there is 
some gnuplot functionality for that I sure like to use it.

Thanks, Mark

--
Mark Savenije (software/system engineer Centre for Advanced Microscopy)
Swammerdam Institute for Life Sciences (SILS)
Faculty of Science, University of Amsterdam, The Netherlands
Kruislaan 316, 1098 SM, Amsterdam, The Netherlands
Tel: ..+31 20 5257860, fax: ..+31 20 5256271
E-mail: ma...@sc..., WWW: http://wwwmc.bio.uva.nl