resize {EBImage} | R Documentation

## Image transformation: rotation, resize, etc.

### Description

Functions to rotate, mirror and resize images.

### Usage

        affinet(x, sx=0, rx=0, ry=0, sy=0, tx=0, ty=0, ...)
        flip(x, ...)
        flop(x, ...)
        resample(x, w, h, ...)
        resize(x, w, h, blur=1, ...)
        rotate(x, angle=90, ...)

### Arguments

`x`
  An object of `Image-class`.
`sx, rx, ry, sy, tx, ty`
  Elements of the affine matrix.
`w, h`
  Width and height of a new resized/resampled image. One of these arguments can be missing to enable proportional resize.
`blur`
  The blur factor, where 1 (`TRUE`) is blurry, 0 (`FALSE`) is sharp.
`angle`
  Image rotation angle in degrees.
`...`
  Reserved for future use.

### Value

A transformed image in an object of `Image-class`.

### Details

`affinet` transforms an image as dictated by the affine matrix.

`flip` creates a vertical mirror image by reflecting the pixels around the central x-axis.

`flop` creates a horizontal mirror image by reflecting the pixels around the central y-axis.

`resample` scales an image to the desired dimensions with pixel sampling. Unlike other scaling methods, this method does not introduce any additional color into the scaled image.

`resize` scales an image to the desired dimensions with one of the filters that can be set using the `Image-class` accessor method `sampleFilter`. Most of the filters are FIR (finite impulse response), however, Bessel, Gaussian, and Sinc are IIR (infinite impulse response). Bessel and Sinc are windowed (brought down to zero) with the Blackman filter.

`rotate` creates a new image that is a rotated copy of an existing one. Positive angles rotate counter-clockwise (right-hand rule), while negative angles rotate clockwise. Rotated images are usually larger than the originals and have 'empty' triangular corners. X axis. Empty triangles left over from shearing the image are filled with the background color.

### Author(s)

Copyright (c) 2005-2006 Oleg Sklyar : osklyar@ebi.ac.uk

### References

ImageMagick: http://www.imagemagick.org.

### See Also

`Image-class, sampleFilter`

[Package EBImage version 2.0.1 Index]