|
"Jaggies" is the informal name for artifacts in raster images, most frequently from aliasing,〔(Mitchell, Don ), "(The Antialiasing Problem in Ray Tracing )", Advanced Topics in Ray Tracing, Course Notes, SIGGRAPH 90.〕 which in turn is often caused by non-linear mixing effects producing high-frequency components or missing or poor anti-aliasing filtering prior to sampling. Jaggies are stairlike lines that appear where there should be smooth straight lines or curves. For example, when a nominally straight, un-aliased line steps across one pixel, a dogleg occurs halfway through the line, where it crosses the threshold from one pixel to the other. Jaggies should not be confused with most compression artifacts, which are a different phenomenon. == Causes == Jaggies can occur for a variety of reasons, the most common being that the output device (display monitor or printer) does not have enough resolution to portray a smooth line. In addition, jaggies often occur when a bit-mapped image is converted to a different resolution. This is one of the advantages that vector graphics has over bit-mapped graphics – the output looks the same regardless of the resolution of the output device. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Jaggies」の詳細全文を読む スポンサード リンク
|