How do I calculate M_I from M_J values?

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To calculate I band magnitudes from J band magnitudes for brown dwarf stars, one must first determine the I-J color values, which are readily available in astronomical data. The user initially sought a method to convert average absolute J band magnitudes to I band magnitudes but realized the need for I-J values. This clarification simplifies the process of finding the desired I band magnitudes. Further assistance may be required if complications arise during the calculation. Understanding the relationship between these color indices is crucial for accurate magnitude conversion.
omoplata
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I have a list average absolute J band magnitudes for brown dwarf stars of different spectral types. I need to find the corresponding I band magnitudes. How do I do this? I don't have the faintest idea.

Thanks.
 
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OK, I just found out that I need to find the I-J values, which can be easily found. I'll post again if I have trouble.
 

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