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DPChallenge Forums >> Tips, Tricks, and Q&A >> How to do Selective Desaturation
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Showing posts 1 - 9 of 9, (reverse)
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12/17/2006 06:46:56 PM · #1
I want to do some selective desaturation on this photo. I want the taillight, license plate and blue and white of the car to stay in color then make all the leaves and etc black and white. How do I go about doing that with Photoshop Elements 5.0? I tried taking the yellow and green out but the dead leaves are under the red channel.

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12/17/2006 06:48:55 PM · #2
Basic-legal DPC Tutorial
12/17/2006 07:03:15 PM · #3
If you're not worried about making it basic-legal, just make a selection of the taillights and invert the selection, so everything BUT the taillights is selected, then do your desaturation and they will stay red.

R.

Something like this:

' . substr('//images.dpchallenge.com/images_portfolio/30861/thumb/439734.jpg', strrpos('//images.dpchallenge.com/images_portfolio/30861/thumb/439734.jpg', '/') + 1) . '

Did what I suggested, plus then loaded the taillight selection and amped the saturation and lightness both, then did some burning around the edges for more pleasing B/W tonalities.

Message edited by author 2006-12-17 19:15:23.
12/17/2006 07:05:25 PM · #4
Quick is to make a snapshot of the original then desat everything except the blue and cyan then go back and paint the tail lights back in. Not perfect but quick.

Message edited by author 2006-12-17 19:05:56.
12/17/2006 07:07:36 PM · #5
nm


Message edited by author 2006-12-17 19:07:54.
12/17/2006 07:07:47 PM · #6
' . substr('//www.fisherfilmworks.com/desat.jpg', strrpos('//www.fisherfilmworks.com/desat.jpg', '/') + 1) . '

make a dupe layer of the orig. then desat. make mask on new layer. select/color range on original layer to capture the blue. then go to the mask on the new layer and paste black to hide blue area on desat layer. then mask out the light and the plate by hand with a black paintbrush.
12/17/2006 07:14:34 PM · #7
Originally posted by cheezweezl:


make a dupe layer of the orig. then desat. make mask on new layer. select/color range on original layer to capture the blue. then go to the mask on the new layer and paste black to hide blue area on desat layer. then mask out the light and the plate by hand with a black paintbrush.


Seems unnecessarily complicated to me; plus the license plate still has color here...
12/17/2006 07:46:25 PM · #8
To make this one, I enlarged the image about 400% on the screen, duplicated the original layer, then used the magnetic lasso to select the watermelon slice. I inverted the selection, and made that part black and white. I used the eraser tool to go in (enlarged about 1000%) to make sure I erased any little stray places I missed (especially on the fingers), and I used the desaturation sponge to desaturate any tiny little places I missed as well. It sounds a lot more complicated than it is and it only took a short time to do. I think it worked out OK. ;)

' . substr('//images.dpchallenge.com/images_challenge/228/thumb/84485.jpg', strrpos('//images.dpchallenge.com/images_challenge/228/thumb/84485.jpg', '/') + 1) . '
12/17/2006 07:47:55 PM · #9
Originally posted by Bear_Music:

Originally posted by cheezweezl:


make a dupe layer of the orig. then desat. make mask on new layer. select/color range on original layer to capture the blue. then go to the mask on the new layer and paste black to hide blue area on desat layer. then mask out the light and the plate by hand with a black paintbrush.


Seems unnecessarily complicated to me; plus the license plate still has color here...


actually it's easy. took 5 minutes. and if you read what he said, you'll see that he wanted the plate in color.
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