Image scaling

Image scaling is the process of changing the size of a digital image. The problem of scaling is especially important when increasing size of images. In this case, indeed, the fact that digital images are made of pixels becomes evident.

An image size can be changed in several ways. Consider doubling the size of following image:

The most easy way of dobling its size is to replace every pixel with four pixels of the same color.

This image shows the annoying effects that what was pixels in the original image are not boxes. This effect can be attenuated using other systems for changing the size of the image. For example, linear interpolation produces the following result.

Linear interpolation is typically better than the trivial system for changing the size of an image, but is not perfect. Other systems for image scaling exist.

External links

• B/W and color scaling
• Interpolation by Vincent Bockaert