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- August 3, 2009 at 5:53 pm #263589
I did a demo on alternative ways to improve a photo, and LAB provided a quick and easy way to salvage those flat & washout look of landscapes, especially those taken under hazy days, when colours are less than spectacular.
1) Open the image in Photoshop CS.
2) Change to LAB mode by selecting, from the menu, Image->Mode->Lab Color
3) From the Histogram, the image appears a little dark, so adjust the tones brighter using levels and shift the white point arrow to the left (from Image->adjustments->levels
The photo should appear now appear brighter.
4) Now open curves from menu, Image->Adjustments->Curves
5) Select the channel ‘a’ from the curves adjustment window
6) shift the top right point left about 2.5 squares and bottom left points right similarly.
use the mouse pointer, click on the point and drag across, keeping the ‘curve’ symmetrical as shown.
7) Similarly, from the curves adjustment window, select the ‘b’ channel
8) and shift the curve similarly as in (6)
9) The image should now have pretty good contrast and colour saturation, next step, sharpening in Lab…
Attachments:You must be logged in to view attached files.August 3, 2009 at 6:07 pm #296338
10) Next we do sharpening, but only in the lightness channel
15) Now change back to RGB mode from the menu
16) Save the image in jpeg. Voila!
Hope this is useful.
Attachments:You must be logged in to view attached files.August 4, 2009 at 3:27 am #296350tanhbSpectator
Thanks for sharing.August 5, 2009 at 5:09 pm #296557wltpchMember
Thanks a lot!
Loong TatAugust 6, 2009 at 8:56 am #296642Yeo, Wee HanSpectator
Thanks PT. I read about LAB mode some years back but never tried it…. Looks like its worth exploring!
HanAugust 6, 2009 at 9:17 am #296646
Yes, Han. I think it is worth exploring, esp for landscapes.
I like the sharpening in the lightness channel, and the quick adjustments for contrast and colours is good for a quick proofing. It’s even good for old photo restoration, and high noise reduction.
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