Color space conversion functions for RGB, YUV, YIQ, XYZ, and HSI.
rgb2grey(obj, compress=TRUE)
rgb2hsi(obj)
hsi2rgb(obj, cspace = "Adobe", compress=TRUE)
rgb2yuv(obj)
yuv2rgb(obj, cspace = "Adobe", compress=TRUE)
rgb2yiq(obj)
yiq2rgb(obj, cspace = "Adobe", compress=TRUE)
rgb2xyz(obj)
xyz2rgb(obj, cspace = "Adobe", black= 0, exposure=1, compress=TRUE)an object of class "adimpro", with value$type specifying the color space
(last three letters of the function name or 'greyscale' for rgb2grey)
and value$img containing the color values.
an object of class "adimpro", obj$type should coincide with
the first three letters of the function name, that is obj$img containes
color values in the corresponding color space.
Target color space, one of c("sRGB","Adobe","wGamut","kodak","xyz").
For function xyz2rgb also c("yuv","yiq") are implemented.
Multiplicative factor for all color channels (in xyz or rgb spaces). Applied in linear color space, i.e. if the image is gamma corrected the gamma correction is reversed first.
Adjustment for black color. Color values with luminance <= black will be assigned to black in RGB.
logical, determines if image data are returned in raw-format.
Karsten Tabelow tabelow@wias-berlin.de and Joerg Polzehl polzehl@wias-berlin.de
The functions convert an image obj from one color space into
another.
rgb2grey converts from RGB to GREYSCALE.
rgb2hsi and hsi2rgb convert from RGB to HSI and vice
versa.
rgb2yuv and yuv2rgb convert from RGB to YUV and vice
versa.
rgb2yiq and yiq2rgb convert from RGB to YIQ and vice
versa.
rgb2xyz and xyz2rgb convert from RGB to CIE XYZ and vice
versa.
Conversion to XYZ, YIQ, YUV and HSI
involves an inverse gamma correction if required.
Gonzalez, R.C., and Woods, R.E. (2002). Digital Image Processing. Prentice Hall.
Polzehl, J., and Tabelow, K. (2007). Adaptive smoothing of digital images, Journal of Statistical Software 19 (1).