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08/22/2003 08:57:28 AM · #1 |
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08/22/2003 09:01:52 AM · #2 |
Another good way to sharpen an image is with a multi-pass sharpen.
(all with threshhold set to 0)
First one is radius 100, amount 20%
Second one is radius 20, amount 20%
Third one is radisu 4, amount 30%
Fourth one is radius 0.5, amount 100%
That sharpens the image considerably without halo-ing it. Also, when you do this, your darks get a bit darker, lights get a bit lighter. So don't add contrast before this step. In fact, you may need to flatten the image a little and leave it with LESS contrast before doing this. But worth it in the end!
:)
M
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08/22/2003 09:04:32 AM · #3 |
Great link, and great tip!
Thanks guys... |
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08/22/2003 09:07:34 AM · #4 |
Second Mav's post, and to add, I've played around with reducing or increasing slightly the amount at each step, I've found that being a little more conservative, e.g. 15%, 15%, 25%, 75% yields excellent results when conservative sharpening is called for.
I also heartily recommend setting threshold to non-zero value (3-4 usually, but depends on initial noise level) to minimize raising noise.
Edit:
I also use the Fred Miranda sharpening action, and I very much like the results.
Message edited by author 2003-08-22 09:08:11.
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08/22/2003 09:31:43 AM · #5 |
| thanks mav and kirbic - your posts are very helpful! |
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08/22/2003 12:50:58 PM · #6 |
Another recommended sharpening technique is to only do your sharpening in Lab mode in the luminosity channel (you can achieve the same thing in RGB by fading the USM in luminosity mode).
By combining USM and gaussian blur layers (with care) you can also remove halo effects. |
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09/16/2003 04:48:56 PM · #7 |
Frisca alerted me to this helpful thread--Thanks! Using Mavik's technique actually created unclarity in the three photos I tried it on. I even fiddled with the levels some when it wasn't working.
I got MUCH better results with just the last step:
Threshold=0
Radius= 0.5
Amount= varied greatly depending on photo (but from approx. 125% to 300%)
I also tried this variation with my three photos:
Threshold=0
Radius=1
Amount=varied greatly depending on photo but was much smaller: 75% - 200%
It looked about the same, though the first method got me more fine details, which was important for one of the photos.
Once I started raising the radius, I began to get a distortion of the image the higher the radius: the fine detail was lost and the photo began to actually look unclear and, for lack of a better term, 'pixel-crystaline', even though it was in focus.
Has anyone else fiddled with Unsharp Mask? |
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09/16/2003 06:02:01 PM · #8 |
I found this quite interesting today
//www.pixelgenius.com/sharpener/why.html
basically recommends a 3-pass approach to sharpening.
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09/16/2003 06:43:27 PM · #9 |
That's a good article. My only "concern" is that the recommendations for the final output sharpening may encourage a little too much, since most of us are not creating output for halftone presses (well, I do at work, but that's different).
I think one has to be especially careful of oversharpening lo-res images like we post here, since they're always being viewed at that actual pixels "chunky" state. |
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09/16/2003 07:26:42 PM · #10 |
Originally posted by GeneralE:
That's a good article. My only "concern" is that the recommendations for the final output sharpening may encourage a little too much, since most of us are not creating output for halftone presses (well, I do at work, but that's different).
I think one has to be especially careful of oversharpening lo-res images like we post here, since they're always being viewed at that actual pixels "chunky" state. |
Yup, exactly the point - that final sharpening pass has to be very tuned to whatever output format you are going for, print needs at varying sizes and viewing distances are quite different, as are those for web needs
Message edited by author 2003-09-16 19:27:19. |
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10/11/2003 11:49:33 PM · #11 |
With the multi-pass sharepen, do you proform each sharpening and save before the next sharpening is proformed?
Originally posted by mavrik:
Another good way to sharpen an image is with a multi-pass sharpen.
(all with threshhold set to 0)
First one is radius 100, amount 20%
Second one is radius 20, amount 20%
Third one is radisu 4, amount 30%
Fourth one is radius 0.5, amount 100%
That sharpens the image considerably without halo-ing it. Also, when you do this, your darks get a bit darker, lights get a bit lighter. So don't add contrast before this step. In fact, you may need to flatten the image a little and leave it with LESS contrast before doing this. But worth it in the end!
:)
M |
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10/12/2003 01:57:46 AM · #12 |
Has anyone ever tried this method?
I got this from one of the photo websites.
Sharpens very well with no halos.
1. Open photo
2. layer - duplicate layer (name sharpen or etc)
3. filter - other - high pass (on the new layer)
4. hard light (Layer tool box)
5. adjust opacity (usually 20% - 70%)
Calvus
Message edited by author 2003-10-12 02:08:18.
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10/12/2003 02:04:57 AM · #13 |
Hey Calvus, I do it that way except, I use the "overlay" in the layer box. I'll have to check out and see how hard light works. But that High Pass filter works pretty good.
Message edited by author 2003-10-12 02:06:29. |
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10/12/2003 02:09:38 AM · #14 |
I really like it.
It does not work well all all photos but it does for most.
Calvus
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