Even for someone who only has to prepare presentations from time to time and cares about the quality of the graphics, Photoshop is more or less not replaceable.

Even for someone who only has to prepare presentations from time to time and cares about the quality of the graphics, Photoshop is more or less not replaceable. I tried gimp for a while but it did not nearly qualify. Do you have any idea, if there is linux-software that comes somewhat close to photoshop?