![cover image](https://wikiwandv2-19431.kxcdn.com/_next/image?url=https://upload.wikimedia.org/wikipedia/commons/thumb/6/69/2xsai_example.svg/640px-2xsai_example.svg.png&w=640&q=50)
Image scaling
Changing the resolution of a digital image / From Wikipedia, the free encyclopedia
In computer graphics and digital imaging, image scaling refers to the resizing of a digital image. In video technology, the magnification of digital material is known as upscaling or resolution enhancement.
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/6/69/2xsai_example.svg/256px-2xsai_example.svg.png)
When scaling a vector graphic image, the graphic primitives that make up the image can be scaled using geometric transformations with no loss of image quality. When scaling a raster graphics image, a new image with a higher or lower number of pixels must be generated. In the case of decreasing the pixel number (scaling down), this usually results in a visible quality loss. From the standpoint of digital signal processing, the scaling of raster graphics is a two-dimensional example of sample-rate conversion, the conversion of a discrete signal from a sampling rate (in this case, the local sampling rate) to another.