English SCI will ask you whether to use color pictures after confirming the acceptance. The color map here refers to the paper printed version of their periodicals. Because the paper and color printing quality of better foreign periodicals are particularly good, the cost of color pictures will be high, so the author will decide whether to use color pictures and pay the fees. However, whether you refuse or accept the use of color pictures, the online version of your article will use the color pictures of your submitted article. Now most people download pdf and read documents online (some older scholars who are not used to computers still read paper magazines or something).

So if you (or your boss) have more money, you can use color maps and buy one or more paper periodicals for collection (the minimum order quantity of some periodicals is 10), otherwise it is unnecessary to use color maps.