Learn in the textbookData Representation Methods for Still Images
DefinitionVector data (ベクターデータ) represents an image with point coordinates and shape information such as the lines and curves that connect them and the fills inside them.
ExplanationBecause it is redrawn from coordinates and formulas every time it is shown, its outlines never blur or turn jagged when scaled up or down. Its size depends not on the on-screen dimensions but on the number and complexity of shapes, so logos and drawings built from simple shapes stay small. On the other hand, it is a poor fit for images like photographs, where the color changes from point to point.
AnalogyIt is like handing over drawing instructions such as “draw a line from this point to that one,” rather than a finished picture. Follow the steps and you can draw it cleanly on paper of any size.
Memory hookVector is the same word as the math term for a quantity with direction. Picture an arrow running from a start point to an end point to draw a line.