| Author | Thread |
|
|
05/31/2006 08:48:44 PM · #1 |
Does anyone have any links regarding forums or tutorials about using this technique to switch from color to black and white?
|
|
|
|
05/31/2006 09:00:21 PM · #2 |
I don't have any links or tutorials, but I just click Monochrome and adjust the red and constant. My red is usually around +110 and the constant is around -5 - -10 just work with that and do what is best for you picture.
I hope this helps
Phillip |
|
|
|
05/31/2006 09:26:18 PM · #3 |
I'll try to explain the process I use. These instructions are for PS.
Apply a channel mixer adjustment layer. Check the "Monochrome" option near the bottom. Then you'll need to fiddle with the percent of the Red, Green, and Blue channels. First, set the Red to 100% and all others to 0. Look at the effect on the image. Then try Green at 100% and all others at 0. Note the change. Then try Blue at 100% and all others at 0. Pick your "favorite" out of the three conversions, and use that as a starting point. Which conversion looked the best to you? If the Red channel, for example, gave you the best conversion of the three, then you can start out with Red at 100%, Blue at 0, and Green at 0. Watch what happens when you add or subtract Red (or Green, or Blue). For the best coversion, you'll usually want the percents of the three to add up to 100% If you boost the Red to 120%, for example, then you might want to set Blue to -20% or Blue to -15% and Green to -5%.
When determining the best possible conversion, you'll want to take noice, contrast, etc. all into consideration.
Hope this helps. Let me know if you have any questions.
Message edited by author 2006-05-31 21:39:19.
|
|
|
|
05/31/2006 09:37:54 PM · #4 |
Originally posted by justin_hewlett:
I'll try to explain the process I use. These instructions are for PS.
Apply a channel mixer adjustment layer. Check the "Monochrome" option near the bottom. Then you'll need to fiddle with the percent of the Red, Green, and Blue channels. First, set the Red to 100% and all others to 0. Look at the effect on the image. Then try Green at 100% and all others at 0. Note the change. Then try Blue at 100% and all others at 0. Pick your "favorite" out of the three conversions, and use that as a starting point. Which conversion looked the best to you? If the Red channel, for example, gave you the best conversion of the three, then you can start out with Red at 100%, Blue at 0, and Green and 0. Watch what happens when you add or subtract Red (or Green, or Blue). For the best coversion, you'll usually want the percents of the three to add up to 100% If you boost the Red to 120%, for example, then you might want to set Blue to -20% or Blue to -15% and Green to -5%.
When determining the best possible conversion, you'll want to take noice, contrast, etc. all into consideration.
Hope this helps. Let me know if you have any questions. |
That's pretty much exactly what I do. And then you can tweak it even more with curves and the normal stuff of course.
|
|
|
|
05/31/2006 09:40:20 PM · #5 |
Originally posted by Cutter:
That's pretty much exactly what I do. And then you can tweak it even more with curves and the normal stuff of course. |
Me too, and I almost always prefer starting with the Green channel. 70% Green, 30% Red is often a good mix. |
|
|
|
05/31/2006 09:42:26 PM · #6 |
Originally posted by scalvert:
Originally posted by Cutter:
That's pretty much exactly what I do. And then you can tweak it even more with curves and the normal stuff of course. |
Me too, and I almost always prefer starting with the Green channel. 70% Green, 30% Red is often a good mix. |
Usually I gravitate more towards the Red channel (and avoid Blue like the plague). It seems to give me the best conversion on the majority of photos.
|
|
|
|
05/31/2006 09:49:44 PM · #7 |
| if you run gaussian blur on the green channel and play around with the sliders (about 140 green, 30 red and -70 blue) you can come up with a photoshop version of IR. |
|
|
|
05/31/2006 09:49:50 PM · #8 |
You are all wasting your time, just click desturate and be done with it ;-) hehe
|
|
|
|
05/31/2006 10:08:58 PM · #9 |
|
|
|
05/31/2006 10:33:40 PM · #10 |
Originally posted by justin_hewlett:
...For the best coversion, you'll usually want the percents of the three to add up to 100%... |
I'm glad you said usually. It appears that the longer I use the channel mixer for this purpose, the more I deviate from the rule - often just a little, sometimes by much. |
|
|
|
05/31/2006 10:43:14 PM · #11 |
Scott Kelby has a new book out that is really fascinating... I picked it up last week.. it's called "The Photoshop Channels Book". It covers this and MANY other phenomenal uses of the channels pallete.
|
|
|
|
06/01/2006 06:44:13 PM · #12 |
| Thanks everyone for the responses. I'm looking forward to trying some of these steps out. |
|
|
|
06/01/2006 07:22:51 PM · #13 |
Two other methods...
create a hue/sat layer, set blend mode to COLOR.
create a hue/sat layer, move the sat layer to 0. (this is the top layer)
you can adjust the hue on the lower hue/sat layer (the color blend one).
alternately, you can put a channel mixer layer under teh hue/sat you used to desat and adjust it's channels - it is VERY sensitive though. Do not check the monochrome box.
|
|
|
|
06/01/2006 07:27:24 PM · #14 |
Originally posted by dr_timbo:
if you run gaussian blur on the green channel and play around with the sliders (about 140 green, 30 red and -70 blue) you can come up with a photoshop version of IR. |
how do you run a gaussian blur on the green channel?
|
|
Home -
Challenges -
Community -
League -
Photos -
Cameras -
Lenses -
Learn -
Help -
Terms of Use -
Privacy -
Top ^
DPChallenge, and website content and design, Copyright © 2001-2025 Challenging Technologies, LLC.
All digital photo copyrights belong to the photographers and may not be used without permission.
Current Server Time: 09/06/2025 08:55:35 AM EDT.
