Which transformation type is used to achieve a resizing effect in graphics?

Dilation is the transformation type used to achieve a resizing effect in graphics. It involves enlarging or reducing the size of an object while maintaining its shape and proportions. During a dilation, all points of the object are moved away from or towards a fixed center point by a scale factor. If the scale factor is greater than 1, the object increases in size; if it is between 0 and 1, the object decreases in size.

This transformation contrasts with other types such as translation, rotation, and reflection. Translation moves an object from one location to another without changing its size or orientation. Rotation involves turning the object around a fixed point, altering its orientation but not its size. Reflection flips the object over a line, creating a mirror image, again without resizing it. Therefore, dilation is the only transformation that specifically alters the size of the object while preserving its shape.