Just found instructions on doing High Pass sharpening in Photoshop, while I was reading a Canon Tutorial on how to take wildflower photos.
It blows my mind how the hell that makes things sharper. How does laying a weird grey image, over the top of the normal image, make it look so much sharper?
I an NOT asking HOW to do High Pass Sharpening. Nor am I disputing that it doeswork. I know how to do it. In fact it's now probably my favourite way of sharpening an image, but it just seems like some kind of "black magic" that a weird greyed out image layed over the normal image, actually sharpens the main image. Talk about a WTH moment. How is a grey image over a normal image making it sharper. I'm a bit lost here.
For those new to all this like I am, who don't even know what I'm talking about, it's a method of sharpening where you take an image, create a duplicate layer, do a High Pass filter on that layer (getting the pixel radius right seems to be the secret - start at around 10 pixels and work up or down from there) and then make it an "overlay" on the original image at about 30-50% transparency.
For some reason this weirdly grey looking image now laid over the original makes the original look so much sharper. How the hell? What the heck? It's black magic I tell ya. It's the devil's work.