When we are select the text in impress and applied color gradient to that text, then the color will be applied to whole page not to that particular selected area .
It seems to me that you are applying the color as a background color for the page.
You need to change the font color or the highlight color.
I also like to recommend to download and use the free-of-charge guides from http://www.libreoffice.org/get-help/documentation/
I need to change the highlight color… where exact code is located in the LO modules? can you help me…