Importing images using subfloats in LaTeX

I am 开发者_如何学Cusing subfloats to import 2 .png files in a figure to basically generate subfigures. There's no space between the figures when I compile it. How do I put some white space in between them? And is it possible to convert them to black and white using LaTeX?

Try \vskip 1em between the figures. If this doesn't work, post your nonworking figure code so we can see what's going on.

To put white space in between them, you can throw a \quad—or anything that makes whitespace—in between the subfloats within the figure. Converting to grayscale is not in the graphicx package as far as I can see; all the literature on it says to use an external program. My first instinct is to explore TikZ (a LaTeX package) just because it is so powerful, but I have no idea if it can do anything with external graphics. This Page deals with compile time options to specify a grayscale or color version. For example, if you have all the color images in one folder, you batch convert them to grayscale and put them in a separate folder with identical filenames. Then, at compile time, specify from which folder to get the images. See the comments for the graphicspath implementation.