My personal belief that sharpening pinhole images for display in the web is a travesty of the truth. The images were not created sharp by the camera and should not be represented as such, by some stretch that the photographer believes it should be sharper to match his usual standard.
I do concede that some sharpening is necessary to at least overcome inherent failings in simple scanning and subsequent displaying, but too many images I have seen are deranging the ethereal softness of pinhole so that the result resembles the tack-sharp images of SLRs, MF or LF! The question is, why? Definition, not sharpness, is the technical bit of pinhole and is best appreciated viewing the negative of a print. Leave the the image as the pinhole created it and delight in primal way of the camera obscura.