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RGB
A method of expressing color.
Colors are expressed by overlaying and combining the three colors, red (R),
green (G), and blue (B). These three colors are called the three primary colors
of light, and by overlaying and combining them, every color can be expressed.
Like light, the image becomes brighter as more colors are overlaid and com-
bined, (if red, green and blue are all combined at 100%, they become white),
so this method is known as the additive color mixture method.
TIFF
An abbreviation for “Tagged Image File Format”.
TIFF is an image data format developed by Aldus and Microsoft.
It is able to organize and store the data of a single image into a single file
with various different resolution, encoding systems and number of colors.
During compression, non-quality loss systems (irreversible compression) such
as LZW or pack bit can be selected.
Thumbnail
An image that has been compressed in order to display a number of such
images together in a list format.
Originally this comes from the words “thumb” and “nail”. In this software,
thumbnails are displayed when the imported images are displayed in list
format on the thumbnail screen.
Threshold value
The boundary limit where some photographic processes do not work.
For example, the UnSharp Mask process defines the applicable criteria of
whether or not an edge is added.
Tone Curve
When the shape of a curve is changed, the relationship between the input
(original image color) and output (image color after adjustment) changes,
and the brightness and contrast within a certain gradation range can be finely
adjusted.
Unsharp mask
One of the sharpness processes, when unsharp mask is applied the color
and brightness of outline parts is accentuated.
Digital Terminology
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