Bold output similar to xxd

[v1gnesh]

In xxd version 2024-05-10 (and probably beginning from an earlier version), the bytes are shown in bold and 00 are duller, making content stand out.
EDIT: Colour in xxd output probably came with vim 9.1 -> https://www.vim.org/vim-9.1-released.php

Can you please add similar differentiation to hexyl.
Details here.

[sharkdp]

Sounds good. Let's maybe add this as a --emphasize or --bold option that takes a value. --emphasize=nothing would be the current setting. --emphasize=non-zero would be what you are suggesting. But other options could be added later.