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The background image is used as the bottom layer, and the image with parts to be added are placed in a layer above that. Using an image layer mask , all but the parts to be merged is hidden from the layer, giving the impression that these parts have been added to the background layer.
The top "layer" is not necessarily a layer in the application; it may be applied with a painting or editing tool. The top "layer" also is called the "blend layer" and the "active layer". In the formulas shown on this page, values go from 0.0 (black) to 1.0 (white).
Low contrast areas are replaced by a gray background. The filtered image will represent the rate of color change at each location of the original image. Applying an embossing filter to an image often results in an image resembling a paper or metal embossing of the original image, hence the name.
In graphics software, layers are the different levels at which one can place an object or image file. In the program, layers can be stacked, merged, or defined when creating a digital image. Layers can be partially obscured allowing portions of images within a layer to be hidden or shown in a translucent manner within another image.
Rotation is now a common feature of modern video cards, and is widely used in tablet PCs (many tablet devices can sense the direction of gravity and automatically rotate the image), and by writers, layout artists, etc. Operating systems and drivers do not always support it; for example, Windows XP Service Pack 3 conflicts with monitor rotation ...
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Scrolling displays built up of individual tiles can be made to 'float' over a repeating background layer by animating the individual tiles' bitmaps in order to portray the parallax effect. Color cycling can be used to animate tiles quickly on the whole screen. This software effect gives the illusion of another (hardware) layer.
The MediaWiki software as of 5 October 2011 checks image metadata such as EXIF and automatically rotates the image when it is uploaded. The file page may show the upright image, but thumbnails may be rotated.