I'd use QtConcurrent::blockingMappedReduced(). First divide the image into chunks, then map the chunks to grayscale chunks and then reduce the chunks into a single image again.
BTW. What is the format (and especially the depth) of your image?
The "Q"
Re: Multithreaded per pixel operations on QImage
I'd use QtConcurrent::blockingMappedReduced(). First divide the image into chunks, then map the chunks to grayscale chunks and then reduce the chunks into a single image again.
BTW. What is the format (and especially the depth) of your image?
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