The Gallery app for viewing graphics in icecream sandwich has a black background. When viewing certain charts copied from the net (Wikipedia) and viewing offline in the picture Gallery the transparent parts of the charts downloaded are appearing black due to the black background. Any text existing in these transparent regions of the original graphic is therefore merging with the black background and becoming invisible. As black on black ought to be. Any way out? Is there any setting by which the background colour can be changed to something lighter - in the manner we change backgrounds in book-readers? Could someone help please?