Opacity or opaque may refer to:
- Impediments to (especially, visible) light:
- Metaphors derived from literal optics:
- Musical works:
- Computer science:
- Measure of obscuration of background by "painting"[clarification needed] an image, e.g. alpha channel
- Use of an opaque data type
- Property attributed to data that can be interpreted only by using an external entity, e.g. magic cookie technology
- Opaque binary blob, in network-engineering and computer-science technology, a large set of binary data (a blob) that looks like garbage to those unacquainted with its internal structure.
Topics referred to by the same term