A string corresponding to the colorspace the image should
be converted to. Options are "BGR" (Blue Green Red image), "BGRA" (BGR image
with Alpha channel), and "GRAY" (grayscale image). Converting from a Bayer
mosaic to BGR using the default algorithm is also possible with "BayerBG2BGR",
"BayerGB2BGR", "BayerRG2BGR", or "BayerGR2BGR".