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• please NEVER do anything per pixel ! (can't be said often enough)
• that opencv has it the rows/cols way is bad enough, but changing the sematics of x or y like x < imageWork.rows makes it only worse. if you ever see yourself writing code like that again -- slap yourself. hard. as often as nessecary.
• you don't need to copy anthing here, a reshape() will do:

Mat kmeansData = imageWork.reshape(1, imageWork.total()); // 1 channel, 3 cols, H*W rows

• please NEVER do anything per pixel ! (can't be said often enough)
• that opencv has it the rows/cols way is bad enough, but changing the sematics of x or y like x < imageWork.rows makes it only worse. if you ever see yourself writing code like that again -- slap yourself. hard. as often as nessecary.worse.
• you don't need to copy anthing anything here, a reshape() reshape() will do:

Mat kmeansData = imageWork.reshape(1, imageWork.total()); // 1 channel, 3 cols, H*W rows