resize {EBImage} | R Documentation |
Functions to rotate, mirror and resize images.
## S4 method for signature 'Image': affinet(x, sx=0, rx=0, ry=0, sy=0, tx=0, ty=0, ...) ## S4 method for signature 'Image': flip(x, ...) ## S4 method for signature 'Image': flop(x, ...) ## S4 method for signature 'Image': resample(x, w, h, ...) ## S4 method for signature 'Image': resize(x, w, h, blur=1, filter="Lanczos", ...) ## S4 method for signature 'Image': rotate(x, angle=90, col, ...)
x |
An object of Image . |
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. |
filter |
Resize pixel sampling filter. |
angle |
Image rotation angle in degrees. |
col |
A numeric, integer or character specifying the background color of the rotated image. Not implemented yet, defaults to black. |
... |
Reserved. |
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 using the supplied
filter algorithm. Available filters are: Point, Box, Triangle, Hermite,
Hanning, Hamming, Blackman, Gaussian, Quadratic, Cubic, Catrom, Mitchell,
Lanczos, Bessel, Sinc
. 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.
A transformed image in an object of Image
.
Oleg Sklyar, osklyar@ebi.ac.uk, 2006-2007
ImageMagick: http://www.imagemagick.org.