NX tut: Sharpening Selectively
Hi all
this is a quick take on the sharpening abilities of NX, with a very basic workflow process.
First, the original, your everyday prancing zebra shot ... you know, the one which everyone has lying around on their hdd? :)
At any point when you are ready to sharpen, the steps I follow are;
1. EDIT LIST
1.1 Click NEW STEP (bott right)
1.2 Click SELECT ADJUSTMENT
1.3 Select FOCUS
1.4 Select UNSHARP MASK
This opens the UNSHARP MASK dialog with it's parameters.
I have applied 100 / 2 / 5 to start with.
Here (while the USM tool is active) I have zoomed in by pressing (Z) and dragging a zoom box around the hind quarter to demonstrate the USM in progress.
Have a look at the grass to the left of the (everyone has one lying one their hdd zebra pic) and notice the effect of the USM.
Check the stripes on the hind leg too.
Very obvious USM applied.
FURTHER, the USM is applied to the ENTIRE pic, not just a selection. Makes sense so far ...
>>> However! I only want to apply USM to the prancing zebra and the areas which make photographic sense, ie, very close to him (or is it her?) hmmm... <<<
We all know sharpening trees / branches etc really show the effects of USM, so we want to stay away from sharpening there. (Well, I think so at least eh?) ;)
The magic of the NX "mask" / selection process kicks in now.
Still with the USM tool active, press (B) which gives you the Brush tool (sorry, screenshot did not want to include the brush shape here) but its just a circle cursor, with a + or - to indicate, well, + or - USM to apply.
Paint away any unsavoury looking USM applied by left clicking and dragging over areas of the image you want to be left alone (IOW, no USM applied to those areas)
NOTE!
If you feel you have removed USM where you wanted to have it in the first place, simply swap your brush by pressing the inverse key (+ or -) depending on which one you have active then, and paint the USM back onto your pic. Neat!
TIP: At any point you can click the (Z) tool to zoom out and see your results. Click (Z), right click and select 100% zoom.
In the above, I have REMOVED USM by painting over the image (all this, without a mask or selection tool, besides a loose brush, applied anywhere)
Notice, to the left of the hind leg, under the belly, is where I have removed USM. The grass and background and other areas are all still with WIP USM applied.
Here, I am revealing the "mask" that NX has created by using the B tool
Notice how undefined the edges are, how loosely the mask can be applied by painting away / back the tool in use ?
The bright red between the legs is because of reducing the brush size (while B is active, press + or -) to change size.
Further, still with B active, you can right click, and the Brush dialog opens, giving you the ability to change the opacity, hardness, size of the brush on the fly.
When done adding / removing selective USM, click OK on the USM dialog box, and you're done.
Lastly (and only for reasons known only to myself, LOL) I have applied the gaussian blur step (hey, I need to play too eh?) , which once more, applies to the WHOLE image by default.
I then repeat steps above for removing blur from the zebra only (B minus) and painting, very loosely, adjusting B size and opacity for effect.
That's it.
USM and Blur applied, using the loose brush selection.
There are other methods to achieving this too, eg. selecting ONLY the zebra, and working on that, this doesn't cover those options.
Hope someone can use this, and it's straightforward enough in it's presentation.
Hope the pics are presentable, if not, just resize them till they look good :)
Should there be any Q. comments etc, shout please.
Rgds
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Kevin
http://forums.dpreview.com/forums/read.asp?forum=1034&message=19240979