最近想投wiley期刊旗下的Microwave and Optical Technology Letters，详看杂志的要求时，发现有如下一段关于彩图的描述：

Color Figures.
Figures submitted in color may be reproduced in color online free of charge. Please note, however, that it is preferable that line figures (e.g. graphs and charts) are supplied in black and white so that they are legible if printed by a reader in black and white. If an author would prefer to have figures printed in color in hard copies of the journal, a fee will be charged by the Publisher.

请大家帮我分析一下，是不是在线文稿选用彩色是免费的，而要出版件的话就要收取费用。

翻了一下论坛，关于wiley旗下期刊的彩图收费问题有不少讨论，解释并不唯一，从该段文字的字面意义看，似乎是如果不需要纸质出版物出彩图而保留在线彩图应该是不收费的。

不知道我理解得是否正确，因为这涉及到提交初稿时图片的选择问题，如果均收费，就都改成灰图格式。

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