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One color entry in a single GIF or PNG image's palette can be defined as "transparent" rather than an actual color. This means that when the decoder encounters a pixel with this value, it is rendered in the background color of the part of the screen where the image is placed, also if this varies pixel-by-pixel as in the case of a background image.
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.
The GIF encoding process can be modified to create a file without LZW compression that is still viewable as a GIF image. This technique was introduced originally as a way to avoid patent infringement. Uncompressed GIF can also be a useful intermediate format for a graphics programmer because individual pixels are accessible for reading or painting.
A young girl looking worried. Worry is a category of perseverative cognition, i.e. a continuous thinking about negative events in the past or in the future. [3] As an emotion "worry" is experienced from anxiety or concern about a real or imagined issue, often personal issues such as health or finances, or external broader issues such as environmental pollution, social structure or ...
Generalized anxiety disorder (GAD) is an anxiety disorder characterized by excessive, uncontrollable and often irrational worry about events or activities. [5] Worry often interferes with daily functioning, and individuals with GAD are often overly concerned about everyday matters such as health, finances, death, family, relationship concerns, or work difficulties.
Mass psychogenic illness (MPI), also called mass sociogenic illness, mass psychogenic disorder, epidemic hysteria or mass hysteria, involves the spread of illness symptoms through a population where there is no infectious agent responsible for contagion.
Ancher, Michael, "The Sick Girl", 1882, Statens Museum for Kunst. Sickness behavior is a coordinated set of adaptive behavioral changes that develop in ill individuals during the course of an infection. [1] They usually, but not always, [2] accompany fever and aid survival.
For people experiencing the physical and mental symptoms of an anxiety disorder, stigma and negative social perception can make an individual less likely to seek treatment. [69] Prejudice that some people with mental illness turn against themselves is called self-stigma. [68] There is no explicit evidence for the exact cause of stigma towards ...