[FineReader Engine 10] Value of L in SubtractColor Method

Can anyone help me out to explain how SubtractColor method of ImageDocument object works?

As we can provide arguments for Hue and Saturation, but what about the third parameter L luminous which is not defined, It works over HSL color model.

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    This method is supposed for filtering static (for example red) text on different blanks, forms (i.e. passports) etc and saving grey/black color. The method changes the lightness (intensity) of the colorful background or text to remove it from the picture to increase the recognition quality. That is the reason why lightness is not passes as a parameter to the method.

    If this method is not suitable for your purposes in this case, please, describe your scenario to search for the workaround.


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