[Tex/LaTex] Add Latex font for figure labels, legends and equation annotations with .png and .eps figures

epspdftexpngpsfrag

For exporting eps figures from Matlab i use matlabfrag and laprint functions so that i split the psfrag commands (.tex) and figure(.eps) streams. During the compilation using pstool or auto-pst-pdf packages, figures with latex text font are automatically added.

But my question is :

How to add figure labels,legends for .png figures similar to psfrag? As the .png is from third-party software.

Can i convert .png to tagged .eps and then add text using psfrag commands?

I prefer to save figures in tagged eps (.eps and .tex) instead of .pdf so that i can add latex font based on the beamer or article class used. I don't like to freeze the font of text in figures by using PDF.

Best Answer

You can't get TeX to find text in a png the way it does for psfrag as essentially the information just isn't there (even if TeX could read the binary file). However if the png image has no text at all you can overlay latex text over it. there are packages to help that but you don't really need a package.

\includegraphics{file.png}%
\begin{picture}(0,0)
\put(-100,2){label 1}
\put(-100,-22){label 2}
\end{picture}

overlays the two labels over the image. Of course you have to judge the coordinates by eye or some external measurement.

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