Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
12-19-2007, 07:39 AM   #16
Veteran Member
jeffkrol's Avatar

Join Date: Sep 2006
Location: Wisconsin USA
Photos: Gallery
Posts: 8,435
QuoteOriginally posted by Lowell Goudge Quote
I think what you see is normal, you are getting a burning out of out of focus highlights.



I think the camera is getting a lot of blame here for seeing what the eye sees, within the dynamic limits of the sensors.
Actually it's the processing. RAW data is linear and quite compressed. It would take a lot to blow out a channel (w/ normal exposures)in RAW. Now if you take that data, apply a gamma curve (to actually make it photographic) and then use the WB multipliers (red is about 1.5X for flash and daylight) and multiply all the red values by that number it is no wonder the red channel goes out w/ red objects. Any red value equal or above 170 all becomes the same when multiplied by 1.5 since 255 is MAX in 8 bit so you lose any gradations. So the balance comes from how much do I underexpose to what highlights do I want to burn....and what way and what processor is best to process them.
One system uses whats called Uni-WB (all multipliers are at 1:1:1 making the luminosity histogram useful again). W/ Pentax you can use a CC40M filter on the lens (or flash), take a custom WB and then shoot using the filter. Expose so that the histogram is close to the right. This would be your best starting point. I hope Pentax will allow the import of WB coefficients in the next camera ala Nikon.
To see what your up against here is a Nikon chart of the "multipliers" used on each channel and each WB:
http://www.pochtar.com/NikonWhiteBalanceCoeffs.htm

How to fix your red flowers, part 2 of 2: Nikon D300/D200/D100 Forum: Digital Photography Review


Last edited by jeffkrol; 12-19-2007 at 07:45 AM.
12-19-2007, 02:10 PM   #17
Veteran Member
stewart_photo's Avatar

Join Date: Apr 2007
Location: Heidelberg, Germany
Posts: 1,864
QuoteOriginally posted by d.bradley Quote
There is also a method of enhancing the red channel by using data from the 'opposite' colour channel, in this case green. The basic principal is to take the textures from the green channel, mix them into the red channel, then colour shift back to the original hues. (snip)

That's truly impressive, d.bradley. Perhaps the best results I've seen from the various methods out there. Now if I could only understand what you've done. I'm not unfamiliar with graphics programs, but a rank beginner when it comes to Photoshop. As a result, I've gotten completely lost several times while trying to follow your description.

So, when or if you get the time, how about walking through the process with some rudimentary step-by-step instructions? Such as...

1. Select this or that.
2. Select the entire image and copy it.
3. Go to this or that tab and select it.
4. In that tab, select this or that (add notes in parenthesis or whatever as needed).
5. Etc...

I most certainly would appreciate the effort and it would likely help others as well. Thanks.

stewart
12-19-2007, 02:20 PM   #18
Veteran Member
Buddha Jones's Avatar

Join Date: Sep 2006
Location: Charlotte, NC
Photos: Gallery
Posts: 2,591
QuoteOriginally posted by mitchkramez Quote
Buddha, love the scary demon face in there! I guess you see what you want to
Yeah, it is a curse.
12-19-2007, 06:26 PM   #19
Site Supporter
Mapleleaf-Mick's Avatar

Join Date: Nov 2007
Location: Saskatoon, Canada
Posts: 299
You guys/gals are incredible with the amount of knowledge you possess. I sit here in awe and read about post processing techniques to get that great picture. I am struggling to just take "good " pictures not knowing anything about photoshop etc. The forums help is very much appreciated by me and it just amazes me how individuals out there have such a inventory of knowledge on all aspects of photography and are so willing to share their experience. From one little camera buff in Saskatchewan, a deep thanks.

12-19-2007, 09:01 PM   #20
Veteran Member




Join Date: Feb 2007
Location: Ontario
Photos: Gallery
Posts: 630
I'll re-write those instructions more clearly, just not tonight I'm completely exhausted. I'm only too happy to give back to the photo community
12-19-2007, 09:20 PM   #21
Loyal Site Supporter
Canada_Rockies's Avatar

Join Date: Nov 2007
Location: Sparwood, BC, Canada
Photos: Gallery | Albums
Posts: 9,528
QuoteOriginally posted by Mapleleaf-Mick Quote
You guys/gals are incredible with the amount of knowledge you possess. I sit here in awe and read about post processing techniques to get that great picture. I am struggling to just take "good " pictures not knowing anything about photoshop etc. The forums help is very much appreciated by me and it just amazes me how individuals out there have such a inventory of knowledge on all aspects of photography and are so willing to share their experience. From one little camera buff in Saskatchewan, a deep thanks.
We all learned from others. As I get older, it is time to pass on the knowledge to those who have less, and continue to learn from those who have more. In my case, I am brand new to digital, although I have been using Pentax cameras since 1960. I am learning all about Lightroom and post processing and all that ... and passing on some other knowledge I have from time to time.
12-20-2007, 08:45 AM   #22
Site Supporter
Mapleleaf-Mick's Avatar

Join Date: Nov 2007
Location: Saskatoon, Canada
Posts: 299
I am the same Albert. I was using film for years starting back in the sixties but I am brand new to Digital. I am finding out (however I really knew inside) just how little I know and how much there is to learn. Top that off with finding out I am red green colour blind. That is going to be a real plus when it comes to post processing.....
12-20-2007, 11:30 AM   #23
Loyal Site Supporter
Canada_Rockies's Avatar

Join Date: Nov 2007
Location: Sparwood, BC, Canada
Photos: Gallery | Albums
Posts: 9,528
QuoteOriginally posted by Mapleleaf-Mick Quote
Top that off with finding out I am red green colour blind. That is going to be a real plus when it comes to post processing.....
Hmmmmmm - I've seen some very, very nice black and white pics on this site.

12-20-2007, 12:14 PM   #24
Veteran Member
jeffkrol's Avatar

Join Date: Sep 2006
Location: Wisconsin USA
Photos: Gallery
Posts: 8,435
QuoteOriginally posted by Mapleleaf-Mick Quote
I am the same Albert. I was using film for years starting back in the sixties but I am brand new to Digital. I am finding out (however I really knew inside) just how little I know and how much there is to learn. Top that off with finding out I am red green colour blind. That is going to be a real plus when it comes to post processing.....
ACTUALLY there are some good books/tutorials on PP "by the numbers", using the eyedropper and curves.
They select this area, sharpen that one, call up
histograms, apply strange filters, and generally try to demonstrate that
if an infinite number of art directors employ an infinite number of
digital tweaks somebody somewhere may throw them a banana.
And yet, most color correction could be handled by monkeys. This
chapter and the next introduce a numerical, curve-based approach calling
for little artistic judgment.

http://www.ledet.com/margulis/PP7_Ch02_ByTheNumbers.pdf
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
camera, dslr, lens, photography
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
the greens nodretep Monthly Photo Contests 0 09-28-2009 10:38 PM
Quick question: burning time & date info on a photo brkl Digital Processing, Software, and Printing 2 05-21-2009 03:34 AM
A question on ''GREENS'' jgredline Pentax Film SLR Discussion 5 07-29-2008 02:44 PM
Greens and Colors johnyeros Post Your Photos! 0 06-02-2007 08:24 AM



All times are GMT -7. The time now is 08:04 PM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top