Hi Ali,
It's a measure of the number of luminance detail changes per given unit length (my rough definition) - in other words high-frequency components equate to fine detail (like hair) whereas low-frequency equates areas where theres large expanses with little change (eg blue sky, with a few clouds).
The reason it's significant is because they require different sharpening treatment ... sharpening is all about increasing contrast around edges; high-frequency stuff needs higher amounts of sharpening, but over a smaller area (eq 300% @ 0.3 as an example) whereas low-frequency stuff needs lower amounts, but over a bigger area (eg perhaps 20% @ 20 pixels).
All covered in your Real World Image Sharpening book (Is that one that you've got, or is it just RWCM and RWCR?)
I reckon when it come time for this young chap's 21st birthday party - and you want to embarrass him with all the shots of him growing up - all you'll need to do is point them to here!
Seriously, apart from the great captures and excellent processing, I think your making a wonderful documentary of his life growing up.
PS: Just don't forget your other kids!
Thanks a lot, Colin. He should be thankful to me. All I have from my own childhood, which I think was a pretty decent childhood, is a few black and whites, now with a yellowish cast on them and all those honeycomb patterns we discussed here on another thread, and with torn corners. When I was in elementray shcool, my father bought a Polaroid and I have better ones in color from those days.
I have more embarrassing pictures of him, when he first learned to stand and pee. I did not think I can post them here; what is the rule, by the way, for posting that kind of pictures of boys?
And this is my only kid for now, so no worries there!
I'm in much the same boat - my mum had a reasonable number of me which I "borrowed" to show a girlfriend at the time - I didn't return them, and most got damaged when stored in a damp garage.
Sean's the one to ultimately ask that question. Personally, I take the position of "I'd have to see the image to be able to tell how I felt about it", but having just said that, with that type of image it's more than likely that I'd feel that it's probably (as opposed to possibly) something best left out of the public arena. And there are probably people here who would be more sensitive to those kinds of things than I am, and we wouldn't want to give them a "bad taste" experience either.I have more embarrassing pictures of him, when he first learned to stand and pee. I did not think I can post them here; what is the rule, by the way, for posting that kind of pictures of boys?
Last edited by Alis; 2nd August 2009 at 09:33 PM.
Last edited by Alis; 5th August 2009 at 03:02 AM.
So, Sean is the "brain" who wrote cambridgeincolor ?
I just saw: the site is also in Portuguese !!!!!!!!!!!
Last edited by McQ; 5th November 2009 at 12:04 AM.