An integer indicating desired the number of rows for the image.
ncol
An integer indicating desired the number of columns for the image.
colorspace
A string indicating the desired color space for the image.
Options are "BGR" (Blue Green Red image, the default), "BGRA" (BGR image
with Alpha channel), and "GRAY" (grayscale image).
bitdepth
A string indicating the desired bit depth for the image.
Options are "8U" (the default), "8S", "16U", "16S", "32S", and "32F".