I disagree. There is an incoherence here, since the DropShadow effect can work with 16 BPP. So, this is an issue anyway.
Moreover, such a limitation¦lacuna should need at least a note in the setting dialogue like i.e. <needs 24BPP minimal>
Friendly
Paul
L'important n'est pas de convaincre, mais de donner à réfléchir.
The important thing is not to convince, but to incite to think.
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There may be incoherence, but there is no problem to fix.
Drop Shadow option works by design only in 24-32bpp. It only lacks proper description. We may argue if it is good design, but that's another matter.
Drop Shadow effect may work even for 8bpp and that's OK as well.