thanks for answering and I apologize for the unclair English !!
For instance I have a logo, color, text and a picture. You see the whole thing as a white rectangle within the logo rests. How may I do that only the logo is visible, not the surrounding white rectangle ? With StarOffice was this possible cropping the image to the desired dimensions and then making the whites transparent with the pipete tool ... With OpenOffice I couldn't do this and also not with Gimp.
Thanks in advance for the interest and help !