Can anyone comment on the below histograms? Basically, I converted an image to B+W with a slight sepia tone (for a more warm look), which means that it's not monochromatic, i.e. the image still has its colour channels.
Anyways, whenever I do the conversion, my histogram changes from a relatively smooth curve (the first image) to the spiked curve (second image). I don't think this is a posterized image, because as far as I understand, posterization is when gaps occur between vertical bars, however, I want to make sure that this assumption is correct before I send the images off to the printer.