Obvious; readily apparent; easy to see or understand.
Open, public; having the property that theories and practices are publicly visible, thereby reducing the chance of corruption.
Not noticeable because it happens automatically or in the background; invisible.
Having the property of transparency, i.e. sufficiently accurate that the compressed result is perceptually indistinguishable from the uncompressed input.
Of an image or animated gif, having parts that do not overwrite the color of the background the image is placed over.
See-through, clear; having the property that light passes through it almost undisturbed, such that one can see through it clearly.
undeniable, obvious