Black and white can be disabled. It's a comic input option. CBZ using comic input is your easiest solution because it takes care of formatting for your the specific device and has a lot of options for turning it to look good on an ebook reader.
However, you can create a simple html file with image tags and import that into calibre. Calibre will take the html file and referenced images and create a .zip file with everything. You can then create an EPUB from that. This option will give you more manual control over the final result.
I still recommend using the comic input by putting all of the images in a zip file with the extension renamed to .cbz. Then tweaking the comic input options to your liking.
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