ilk - Man Page

ilk [@file ...] [-i <image>] [-0 <origin>] -t <xform0 ...> [-k <kernel>] [-min <xMin yMin>] [-max <xMax yMax>] [-b <boundary>] [-bg <bg0 bg1 ...>] [-s <xSize ySize>] [-a <avg #>] [-o <filename>]

(I)mage (L)inear Trans(X-->K)forms. Applies linear (homogenous coordinate) transforms to a given image, using the given kernel for resampling.

@file ...

response file(s) containing command-line arguments

-i <image>

input image; default: “-”

-0 <origin>

where to locate (0,0) prior to applying transforms.

• “u:<float>,<float>” locate origin in a unit box [0,1]x[0,1] which covers the original image
• “p:<float>,<float>” locate origin at a particular pixel location, in the index space of the image

default: “p:0,0”

-t <xform0 ...>

transform(s) to apply to image. Transforms are applied in the order in which they appear.

• “identity”: no geometric transform, just resampling
• “translate:x,y”: shift image by vector (x,y), as measured in pixels
• “rotate:ang”: rotate CCW by ang degrees
• “scale:xs,ys”: scale by xs in X, and ys in Y
• “shear:fix,amnt”: shear by amnt, keeping fixed the pixels along a direction <fix> degrees from the X axis
• “flip:ang”: flip along axis an angle <ang> degrees from the X axis
• “a,b,tx,c,d,ty”: specify the transform explicitly in row-major order (opposite of PostScript) (1 or more 2D transforms)

-k <kernel>

reconstruction kernel; default: “cubic:0,0.5”

-min <xMin yMin>

lower bounding corner of output image. Default (by not using this option) is the lower corner of input image. (2 doubles)

-max <xMax yMax>

upper bounding corner of output image. Default (by not using this option) is the upper corner of input image. (2 doubles)

-b <boundary>

what to do when sampling outside original image.

• “bleed”: copy values at image border outward
• “wrap”: do wrap-around on image locations
• “pad”: use a given background value (via “-bg”)

default: “bleed”

-bg <bg0 bg1 ...>

background color to use with boundary behavior “pad”. Defaults to all zeroes. (1 or more floats)

-s <xSize ySize>

For each axis, information about how many samples in output:

• “x<float>”: number of output samples is some scaling of the number input of samples; multiplied by <float>
• “<int>”: specify exact number of samples (2 sampling specifications)

default: “x1 x1”

-a <avg #>

number of averages (if there there is only one rotation) (unsigned int); default: “0”

-o <filename>

file to write output nrrd to (string); default: “-”

gprobe(1), miter(1), mrender(1), nrrdSanity(1), overrgb(1), puller(1), tend(1), unu(1), vprobe(1)

gprobe(1), miter(1), mrender(1), nrrdSanity(1), overrgb(1), puller(1), tend(1), tend-anplot(1), unu(1), vprobe(1).