Even if you look at a color picker in Photoshop, it's clear that a dark or navy blue isn't actually that far from being black, and is quite far from other hues which we would still call blue.

即使你在 Photoshop 中颜色选择器查看，很明显深蓝色或藏青色实际上离黑色不远，而且与我们仍然称之为蓝色的其他色相相去甚远。