For an image, the term monochrome is usually taken to mean the same as black and white or, more likely, grayscale, but may also be used to refer to other combinations containing only tones of a single color, such as green-and-white or green-and-black.
Chinese has more native speakers than any other language, followed by Hindi and Urdu, which have the same linguistic origins in northern India. English comes next with 527 million native speakers. Arabic is used by nearly 100 million more native speakers than Spanish. The numbers are fascinating because they reflect the fact that two-thirds of the world's population share only 12 native languages.
However, all such lists should be used with caution. 1  First, it is difficult to define exactly what constitutes a language as opposed to a dialect. 2  Second, there is no single criterion for how much knowledge is sufficient to be counted as a second-language speaker. For example, English has about 400 million native speakers but, depending on the criterion chosen, can be said to have as many as 2 billion speakers.