Combining Images

The principle use of PSMERGE is to combine more than one EPS file into a single picture. For example:

% psmerge pic1.eps pic2.eps > printme.ps

will overlay the two pictures with their origins at the same place on the paper.

For line graphics and text the order of the files does not make any difference but if either picture contains filled areas or grey scale images it does. Filled areas and grey scales are opaque and will obliterate anything already plotted in the same region of the page. Therefore, for example, to overlay a contour map on a grey scale image, the file containing the contour map must appear after the one containing the image.