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DPChallenge Forums >> Individual Photograph Discussion >> Is this oversharp?
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 11/12/2005 06:33:58 PM · #1
I was just goofing around on a walk today with the family. Was trying the High Pass technique of sharpening mentioned on another thread. Opinions about the image in general or about the sharpening?

11/12/2005 06:39:58 PM · #2
Sharpening looks ok.

Have you tried LAB mode>Channels (pick lightness)>Unsharpen> Back to RGB mode.
 11/12/2005 06:41:42 PM · #3
Originally posted by faidoi:
Sharpening looks ok.

Have you tried LAB mode>Channels (pick lightness)>Unsharpen> Back to RGB mode.


Conversion to LAB mode and back can do undesirable things to color gamut. Better to do your USM pass, then immediately edit>fade Unsharp Mask and choose the luminosity blend mode. Same effect, no conversion required.
 11/12/2005 06:43:01 PM · #4
Looks great on the shroon...
 11/12/2005 07:14:00 PM · #5
Is that a halo around the mushroom, or just nasty chromatic aberration?
 11/12/2005 07:20:06 PM · #6
What halo?

Originally posted by riot:
Is that a halo around the mushroom, or just nasty chromatic aberration?
11/12/2005 07:31:14 PM · #7
Doesn't look too sharp but something about it...the contrast or it's deep saturation(perhaps?), is a bit harsh. Otherwise it's very cool image.
 11/12/2005 07:35:17 PM · #8
There might be something around the mushroom. I do most of my work on a laptop at 1900x1200 and that can hide mistakes which show up on CRT at lower resolution. I did a few things on this that I may not normally do. I shifted the yellow hue +20 to green. (Has anybody else noticed that when you saturate or work on plants that it's the yellow channel which commands the majority of pixels?) I also masked most adjustment layers and painted over the mushroom as it was too delicate to handle any manipulation.

I usually go upstairs and check to see how it looks on my CRT, but lately I've noticed my CRT must be getting old as it isn't as bright as it used to be. Even at max bright/contrast, I can't get it bright enough to differentiate the last 4-5 boxes on the gradient scale. So I'm mostly left hoping I haven't made mistakes I can't see.
 11/12/2005 07:37:23 PM · #9
I tried editing on my laptop today...couldn't see what the hell I was doing...gave up.
11/12/2005 08:02:18 PM · #10
Well, I looked upstairs and can't say I see any artifact around the mushroom...
 11/13/2005 02:44:03 AM · #11
I see it (CRT, not formally calibrated). It's a dark "halo" around the cap of the 'shroom. Either a masking or sharpening artifact.

11/13/2005 02:53:39 AM · #12
Originally posted by DrAchoo:
There might be something around the mushroom. I do most of my work on a laptop at 1900x1200 and that can hide mistakes which show up on CRT at lower resolution. I did a few things on this that I may not normally do. I shifted the yellow hue +20 to green. (Has anybody else noticed that when you saturate or work on plants that it's the yellow channel which commands the majority of pixels?) I also masked most adjustment layers and painted over the mushroom as it was too delicate to handle any manipulation.

I usually go upstairs and check to see how it looks on my CRT, but lately I've noticed my CRT must be getting old as it isn't as bright as it used to be. Even at max bright/contrast, I can't get it bright enough to differentiate the last 4-5 boxes on the gradient scale. So I'm mostly left hoping I haven't made mistakes I can't see.


Overall it looks way oversharpened to me, which is to say the localized contrast is extreme. It's not real looking at all.

Regarding the yellow channel, MOST definitely. The "green" of living foliage, in particular, is MUCH more connected to yellow and cyan channels than it is to green channel. So much so that often moving the green saturation has virtually no effect.

R.
 11/13/2005 12:31:56 PM · #13
Originally posted by kenskid:
What halo?

Originally posted by riot:
Is that a halo around the mushroom, or just nasty chromatic aberration?




I know this is pixel-peeping to quite an extreme level, but these things are noticeable at 640. You have a dark halo on the outside of the mushroom's edge, accompanied by a light halo on the inside - classical mark of too much USM. For this image, possibly try reducing the radius of the unsharp mask? The halo is only visible because it is "bleeding" over pixels too far from the edge you're trying to highlight.
 11/13/2005 02:17:13 PM · #14
Thanks riot, here is the original only cropped, resized and compressed. I didn't use USM remember, I used High Pass to try to accomplish sharpening.

Those artifacts could more easily come from my quick masking.

I 100% agree Bear. You look at a picture of lush greenery and think you are going to need to manipulate the green channel, but it's always the yellow that changes the intensity.

Original: Is the artifact there as well?



I love pictures of moss, but have a difficult time with them. They either turn into mushy shades of green with little definition, or they get oversharp easy. Or, if you are doing a mossy tree, the greens quickly turn to blacks and you get an unapppealing picture. Any tips from moss lovers out there?
 11/13/2005 08:44:09 PM · #15
Originally posted by DrAchoo:
Original: Is the artifact there as well?


Hmm, have you got in-camera sharpening turned on? There's definitely a hint of halo around the top edge of the mushroom and around the stem, but it's much less obvious than in the edited version, not at all noticeable unless i look at it stupidly close-up. If your in-camera sharpening is on, then your high pass was just exacerbating the artefects from that. If it's not, then i'm at a loss... i suppose it might just be a trick of the light.
 11/13/2005 09:05:50 PM · #16
I think it is actually a small force field generator. The really small ones often produce that halo effect:-)
 11/13/2005 09:06:16 PM · #17
Wow - Talk about being into extreme details. ;^) Had it not been pointed out to me I would not have noticed, and certainly not commented or marked down a score in a challenge, the halo being mentioned. I was almost ready to say that it could possibly be just natural with the way the moss behind the mushroom has many dark edges. Then I saw riot's blow-up...maybe there is something there.

But gosh almighty - how in the heck did you see it to begin with? Yikes. Makes me feel like nothing will ever be perfect enough to 'compete' again. Then again, maybe I'll get lucky on the 2 or 3 second scan most entries get and sneak a couple flaws past y'all. ;^)

Wow!
 11/13/2005 09:07:23 PM · #18
Originally posted by cdcootie:
I think it is actually a small force field generator. The really small ones often produce that halo effect:-)

Only when you eat them...
 11/13/2005 09:16:28 PM · #19
Originally posted by jhonan:
Originally posted by cdcootie:
I think it is actually a small force field generator. The really small ones often produce that halo effect:-)

Only when you eat them...


dang it I knew I shouldn't have followed that rabbit...it gets me every time.
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