Method Image.Image()->dct()

Method dct

object dct(int newx, int newy)

Description

Scales the image to a new size.

Method for scaling is rather complex; the image is transformed via a cosine transform, and then resampled back.

This gives a quality-conserving upscale, but the algorithm used is n*n+n*m, where n and m is pixels in the original and new image.

Recommended wrapping algorithm is to scale overlapping parts of the image-to-be-scaled.

This functionality is actually added as an true experiment, but works...

Parameter newx

Parameter newy

new image size in pixels

Returns

the new image object

Note

Do NOT use this function if you don't know what you're dealing with! Read some signal theory first...

It doesn't use any fct (compare: fft) algorithms.