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The only requirement was that this image was invisible, either by being the same color as the page, or by being transparent. Spacer GIFs themselves were small transparent image files. GIF files were used as it was a common format that supported transparency, unlike JPEG. These files were commonly named spacer.gif, transparent.gif or 1x1.gif.
GIF animation of an Apollonian sphere packing with transparent background. Transparency in computer graphics is possible in a number of file formats. The term "transparency" is used in various ways by different people, but at its simplest there is "full transparency" i.e. something that is completely invisible. Only part of a graphic should be ...
Salvator Mundi (detail of the left hand and transparent orb. This detail is important as there should be light diffraction through the orb. Leonardo knew this but decided NOT to follow the physics of diffraction fearing it would attract too much the admirers)
Oriented FAST and rotated BRIEF (ORB) is a fast robust local feature detector, first presented by Ethan Rublee et al. in 2011, [1] that can be used in computer vision tasks like object recognition or 3D reconstruction.
Hill says that with the advent of digital photography, "the ghost light is re-imagined as an orb", and many paranormal-themed websites show pictures containing visual artifacts they refer to as "orbs" that are claimed and debated as evidence of spirit presence, especially among ghost hunters. [15] [16] [17] [18]
A see-through display or transparent display is an electronic display that allows the user to see what is shown on the screen while still being able to see through it. The main applications of this type of display are in head-up displays , augmented reality systems, digital signage, and general large-scale spatial light modulation .
The tomb of Childeric I, a fifth-century king of the Franks, contained a 3.8 cm (1½ inch) diameter transparent beryl globe. [3] The object is similar to other globes that were later found in tombs from the Merovingian period in Gaul and the Saxon period in England. Some of these were complete with a frame suggesting an ornamental object. [4]
The first is characterized by "ghostlike" grey blobs perceived at the intersections of a white (or light-colored) grid on a black background. The grey blobs disappear when looking directly at an intersection. The second is constructed by superimposing white discs on the intersections of orthogonal gray bars on a black background.