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please NEVER use cvLoadImage(), or anything from opencv's deprecated C-api , it might be gone tomorrow.
you don't even have to use anything from opencv there, darknet has it's own image loading routines (stb_image)
yes, you have to split your interleaved pixels into seperate color planes, or channels. that's not at all specific to darknet, but common to all dnn's
darknet also already has builtin functions to deal with this, please look at src/image.c, there's ipl_into_image() and such
opencv has a split() function to seperate the interleaved image into channels.