Cariad
Logo Queen
Premium,ExMod 2001-03
join:2000-07-02
Staten Island, NY
clubs:
| reply to Edit This
Re: Punch up those photos.......fast and easy.
Canon PowerShot A20
11.3mm 1/125th F11
before | 
Canon PowerShot A20
11.3mm 1/125th F11
after |
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manfmmd
Premium
join:2003-01-14
Earth
clubs:
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Before | 
After |
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Bryon
R.I.P. Bassman442
Premium
join:2001-07-23
Speedway, IN
clubs:
 ·Comcast
| reply to Edit This
A few months ago, I started experimenting with sharpening in L*a*b mode. As I read various boards regarding this technique, I found some concerns about double conversions and potential image degradation, i.e. RGB > L*a*b >RGB.
There are a few threads at dgrin.com and dpreview.com (mostly centered around L*a*b sharpening, not image punchup).
Please don't take this as me being a naysayer, just thought it fair to point out that what you may gain on one end of the equation, you may lose on the other end.
regards, Bryon
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No man is an island, though you could strive to be a peninsula... |
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MikeG
Premium
join:2004-10-02
Hamilton, ON
·Mountain Cable
1 edit | reply to 35375105
said by 35375105  :Wouldn't this do the same as duplicating the layer, setting the layer to overlay, then adjusting the opacity of the layer? yep, exactly.
Actually, its even refered to as a Digital Polorizer on a tutorial i read somewhere.
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~The heart of learning is the will to try~ |
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Edit This
Premium
join:2001-05-08
| reply to 35375105
said by 35375105 :Wouldn't this do the same as duplicating the layer, setting the layer to overlay, then adjusting the opacity of the layer? LAB method seems to work better for me. Here are examples. 1st image is original....2nd is LAB......3rd is RGB Overlay method.
Canon EOS 10D
17mm 1/20th F4.5 ISO100
Canon EOS 10D
17mm 1/20th F4.5 ISO100
Canon EOS 10D
17mm 1/20th F4.5 ISO100
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I post therefore I am. |
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barqsdrinker
What Can I Photograph Today?
Premium
join:2001-02-26
Apo, AE
clubs:
| reply to Edit This
Tried it out on a photo. Not 100% sure I like it for this particular photo, but it might come in handy for others.
Canon EOS DIGITAL REBEL
80mm 1/125th -0.5ev F3.5 ISO100
Before
Canon EOS DIGITAL REBEL
80mm 1/125th -0.5ev F3.5 ISO100
After
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Thanks for reading!  |
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Nezmo
The name's Bond. James Bond.
Premium,MVM
join:2004-11-10
Coppell, TX
| reply to jfgnet
said by jfgnet :From Photoshop Help quote:
The Lab Color mode has a lightness component (L) that can range from 0 to 100. In the Adobe Color Picker, the a component (green-red axis) and the b component (blue-yellow axis) can range from +127 to –128. In the Color palette, the a component and the b component can range from +127 to –128.
You can use Lab mode to work with Photo CD images, edit the luminance and the color values in an image independently, move images between systems, and print to PostScript Level 2 and Level 3 printers. To print Lab images to other color PostScript devices, convert to CMYK first.
Lab images can be saved in Photoshop, Photoshop EPS, Large Document Format (PSB), Photoshop PDF, Photoshop Raw, TIFF, Photoshop DCS 1.0, or Photoshop DCS 2.0 formats. You can save 48‑bit (16‑bits-per-channel) Lab images in Photoshop, Large Document Format (PSB), Photoshop PDF, Photoshop Raw, or TIFF formats.
Note: The DCS 1.0 and DCS 2.0 formats convert the file to CMYK when opened.
Lab color is the intermediate color model Photoshop uses when converting from one color mode to another.
Thanks for that but quite honestly, I still don't understand what it's use is. Why would you change from one color mode to another for instance?
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My Gallery
Formerly Nezmo  |
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Edit This
Premium
join:2001-05-08 | reply to Edit This
Very nice work everyone.
Got any more? |
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jfgnet
12 Step Program
Premium,MVM
join:2001-02-14
Limbo
clubs: | reply to Nezmo
Some operations are are more efficient under different modes, for instance Postscript level 2 & 3 are supposed to better with LAB Mode, level 1 works better with CMYK Mode, monitor display outpu in RGB Mode, Commecial printing i CMYK Mode etc... |
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manfmmd
Premium
join:2003-01-14
Earth
clubs:
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Before | 
After |
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Jtmo
Premium
join:2001-05-20
Novato, CA
·Comcast
| reply to Edit This
NIKON E2100
4.7mm 1/118th F2.6 ISO100
original set to 800x600 | 
NIKON E2100
4.7mm 1/118th F2.6 ISO100
Lake Tahoe East Shore |
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Sledhed
Eamus Catuli
Premium
join:2005-01-19
Crete, IL
1 edit | reply to Edit This
Here's my try.
Chris
For some reason it did not put the captions in. First image is the original. Second is the Lab color. Third is curves. |
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rcroning
D70 Rocks
Premium
join:2005-05-21
Winnipeg, MB | reply to Edit This
Works great!!! Used it on my New Year greeting. Thanks!!!:) |
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McFly
Premium
join:2001-09-03
Carleton Place, ON
·Rogers Hi-Speed
| reply to Edit This
Here is my go at it. Image from the summer.
Canon EOS DIGITAL REBEL XT
18mm 1/100th F6.3 ISO100
Before
Canon EOS DIGITAL REBEL XT
18mm 1/100th F6.3 ISO100
After
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Edit This
Premium
join:2001-05-08 | Hey....that looks great McFly !!!! |
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McFly
Premium
join:2001-09-03
Carleton Place, ON
·Rogers Hi-Speed
| said by Edit This :Hey....that looks great McFly !!!! Thanks. Nice technique you came up with.
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"We didn't lose the game; we just ran out of time." Vince Lombardi |
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SimbaTLK1
Rawrrr
join:2001-09-07
Bethel Park, PA
clubs: | reply to Edit This
just seems to me like a contrast boost... |
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Edit This
Premium
join:2001-05-08
| reply to Edit This
You can experiment with other channels and blending modes. Here are some examples of an image I worked with. Note the blending modes and different LAB channels I used. Try different things and see what happens. Keep the opacity option in mind at all times to tune the image to your liking.
50mm 1/180th F8 ISO100
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I post therefore I am. |
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ff1324
Everybody Goes Home
Premium
join:2002-08-24
On Four Day
| reply to Edit This
Original | 
LABBED | 
Original | 
LABBED and Lower Red |
It really didn't do much for the picture of the front of the fire truck (different fire). I lowered the red level in the picture and that really made it look better.
I have to agree, however, the effect primarily appears to be a contrast and brightness change. Does the Overlay serve to increase the saturation of the colors?
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The funny thing about firemen...night and day they're always firemen |
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Edit This
Premium
join:2001-05-08
| said by ff1324 : Does the Overlay serve to increase the saturation of the colors? I have yet to find the definitive answer to that question. I will post it asap. Should be within a week max.
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I post therefore I am. |
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