Imagecache Textactions: Changing Line-Height (when using textareas to render)

hello forum,

is there a possibility to change the line-height of rendered text in imagecache-textactions?
if you render a textarea, the space between the lines is to high.
maybe it is possible to change the height in files like textactions.inc or textrender.inc? but i dont understand these files - does someone have a hint?

best regards, adam