méretezési

Méretezési is a term used to describe the process of changing the size of an object, structure, or dataset, often while aiming to preserve its proportions. In geometry and related fields it refers to scaling a figure by a scale factor, producing a similar figure. The factor k determines enlargement (k>1) or reduction (0<k<1), and the operation may occur with a fixed center, called the center of dilation.

In mathematics, scaling is a type of similarity transformation. Distances from the center of dilation multiply by the absolute value of the scale factor, and the orientation of the figure is preserved if k is positive. If k is negative, the figure is reflected as well as scaled. Isotropic scaling applies the same factor to all directions, while anisotropic scaling uses different factors along different axes, which can alter the shape's proportions.

In computer graphics and digital imaging, méretezés commonly refers to resizing raster images or user interface elements. The process relies on interpolation to estimate new pixel values. Common methods include nearest neighbor, bilinear, bicubic, and Lanczos interpolation, each balancing quality and performance differently. Vector graphics scale without loss of quality because they describe shapes mathematically rather than as pixels. Practical considerations include preserving aspect ratio to avoid distortion and understanding that aggressive upscaling can introduce blur or artifacts.

In layout, typography, and responsive design, méretezés involves adjusting sizes and spaces across devices or contexts. Relative units and scalable fonts help maintain readability and visual harmony when the display size changes.

See also: scaling (mathematics), image resizing, interpolation.