Igor Roshchin a écrit :
Hello!
[...]
2. When do you use sharp/unsharp filters in the PS or
other software? (any hints on how to judge a reasonable level?)
As an example, here is my photo of San Diego downtown taken from the plane.
It is not a photo for presentation, just something that I am
practicing on, and I am not happy with it.
I wonder what else can be done to improve it.
"original" photo:
http://www.komkon.org/~igor/PHOTOS/SanDiego/IMGP2417-2sm.jpg
and the one after "unsharpen mask" applied in PS:
http://www.komkon.org/~igor/PHOTOS/SanDiego/IMGP2417-2sharpsm.jpg
Here is what I could do quite quickly (based on your full size version):
http://www.lacouture.nom.fr/gallery/v/discuss/IMGP2417-2sm-PL.jpg.html
What I did to it:
- Duplicate the image to a new layer
- Apply a "HiRaLoAm" to it: Unsharp masking with High Radius (50
pixels), low amount (40), and change blend mode to Luminosity. Select
opacity for best results (75% here)
- Create a Levels layer on top, and use it to adjust the levels
manually: move the cursors to cut out the unused histogram areas in
highlights and shadows, so shadows get darker and highlight get
brighter. This to overcome the fact that the window glass kills the
contrast from your image.
- Create a Hue/Saturation layer again on top, and use it to add a
bit of saturation to get back some color from the blue cast.
- Resize as needed.
- Duplicate the background layer again, and place it on top of the
HiRaLoAm layer, below the adjustment layers.
- Apply an classic Unsharp masking, with Low Radius (0.8 pixels),
high amount (200!). Change blend mode to Darken (sharpening gets ugly in
highlights much faster than in darker areas), and adjust the effect with
the opacity cursor (here around 60%).
I'd say it still needs some color correction to remove the blue cast...
(I'll remove this photo from my website sometime soon. Just tell me if
you want me to do so faster, Igor).
In your opinion, is this image oversharpened?
A bit. So is my version. Fine-tuning with two layers (one in darken
mode, the other in lighten mode), with careful tweaking of radius and
opacity, is time consuming, but usually gives very good results.
Patrice
