Tony Cook
/
Imager-1.024
/
convert.im
NAME
convert.im - image conversions
SYNOPSIS
out = i_convert(srcimage, coeff, outchans, inchans)
DESCRIPTION
Converts images from one format to another, typically in this case for converting from RGBA to greyscale and back.
- i_convert(src, coeff, outchan, inchan)
-
Converts the image src into another image.
coeff contains the co-efficients of an outchan x inchan matrix, for each output pixel:
coeff[0], coeff[1] ...
im[x,y] = [ coeff[inchan], coeff[inchan+1]... ] * [ src[x,y], 1]
... coeff[inchan*outchan-1]
If im has the wrong number of channels or is the wrong size then i_convert() will re-create it.
Now handles images with more than 8-bits/sample.
- is_channel_copy(coeff, outchan, inchan, chan_copy_info)
-
Test if the coefficients represent just copying channels around, and initialize lists of the channels to copy, zero or set to max.
- convert_via_copy(im, src, chan_copy_info)
-
Perform a convert that only requires channel copies.
SEE ALSO
Imager(3)
AUTHOR
Tony Cook <tony@develop-help.com>