Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
02-08-2009, 06:51 PM   #1
New Member




Join Date: Aug 2008
Location: Waterloo, Iowa
Posts: 24
Converting a Negative to a Positive

I have a Pentax K20D and am not sure whether I have located, in the manual, info about a feature that will allow me to convert a close-up picture I take of a film negative into a positive. I'm primarily thinking about B&W. Can this model do that?

I have Adobe Photoshop CS2 as well. Any help will be greatly appreciated.

Thanks!

Tom


02-08-2009, 07:06 PM   #2
Veteran Member
jeffkrol's Avatar

Join Date: Sep 2006
Location: Wisconsin USA
Photos: Gallery
Posts: 8,435
QuoteOriginally posted by Iowa Tom Quote
I have a Pentax K20D and am not sure whether I have located, in the manual, info about a feature that will allow me to convert a close-up picture I take of a film negative into a positive. I'm primarily thinking about B&W. Can this model do that?

I have Adobe Photoshop CS2 as well. Any help will be greatly appreciated.

Thanks!

Tom
Invert function should work. Problem is the sepia (whatever color) mask in the negative but that removable should be doable as well. I wonder if you could take a way overexposed negative and use it to do a custom white balance? Then shoot the negative. I know scanners can do the conversion in software right from the scan so it shouldn't be too hard.
seems my ideas have some basis in reality:
Re: Digitizing negative color film ..............: Retouching Forum: Digital Photography Review
02-08-2009, 07:17 PM   #3
Pentaxian
Wheatfield's Avatar

Join Date: Apr 2008
Location: The wheatfields of Canada
Posts: 10,574
In Photoshop:
Image/Adjustments/Invert will do what you want.
02-08-2009, 08:27 PM   #4
Veteran Member
jeffkrol's Avatar

Join Date: Sep 2006
Location: Wisconsin USA
Photos: Gallery
Posts: 8,435
Brief pictorial.

After a quick search, it seemed all the "techniques" were quite complicated and
probably rightly so for best quality. The other option was just to buy software such as vuescan.
Anyways decided to try it myself from someone's "sample" negative.
Easiest way seems to be to
1)Add cyan
2)increase contrast using levels.
3)invert
Not perfect, but not bad for 10 minutes...........





02-08-2009, 08:44 PM   #5
Veteran Member
alohadave's Avatar

Join Date: Jan 2008
Location: Quincy, MA
Photos: Gallery | Albums
Posts: 2,024
QuoteOriginally posted by Wheatfield Quote
In Photoshop:
Image/Adjustments/Invert will do what you want.
If it's a B&W negative, this will work. Otherwise you have to deal with the orange mask that color negative film uses.

Jeff, that conversion looks pretty good.
02-08-2009, 09:44 PM   #6
Pentaxian
Wheatfield's Avatar

Join Date: Apr 2008
Location: The wheatfields of Canada
Posts: 10,574
QuoteOriginally posted by alohadave Quote
If it's a B&W negative, this will work. Otherwise you have to deal with the orange mask that color negative film uses.

Jeff, that conversion looks pretty good.
He did mention primarily B&W.
02-08-2009, 10:58 PM   #7
Veteran Member
alohadave's Avatar

Join Date: Jan 2008
Location: Quincy, MA
Photos: Gallery | Albums
Posts: 2,024
QuoteOriginally posted by Wheatfield Quote
He did mention primarily B&W.
So he did. I missed that.
02-09-2009, 10:32 AM   #8
New Member




Join Date: Aug 2008
Location: Waterloo, Iowa
Posts: 24
Original Poster
Thanks all. About the problem with the orange mask in color negs, I once dealt with that when an industrial photographer. I was trying to make a color paper negative using photographic paper then use that to make a color positive on the same type of paper. I almost gave up on getting the colors right, but then I thought of adding the film's orange tone to the color paper neg. Then it worked! That was a Eureka moment for me.

02-09-2009, 02:04 PM   #9
Pentaxian
Wheatfield's Avatar

Join Date: Apr 2008
Location: The wheatfields of Canada
Posts: 10,574
QuoteOriginally posted by Iowa Tom Quote
Thanks all. About the problem with the orange mask in color negs, I once dealt with that when an industrial photographer. I was trying to make a color paper negative using photographic paper then use that to make a color positive on the same type of paper. I almost gave up on getting the colors right, but then I thought of adding the film's orange tone to the color paper neg. Then it worked! That was a Eureka moment for me.

What you can do for the mask is take a sample of it from between frames and make an inverted layer mask to neutralize the orange, and then invert the entire image.
This is much like what Jeff did, and I suspect the process could be automated in an action.
02-09-2009, 03:17 PM   #10
Veteran Member
jeffkrol's Avatar

Join Date: Sep 2006
Location: Wisconsin USA
Photos: Gallery
Posts: 8,435
QuoteOriginally posted by Wheatfield Quote
What you can do for the mask is take a sample of it from between frames and make an inverted layer mask to neutralize the orange, and then invert the entire image.
This is much like what Jeff did, and I suspect the process could be automated in an action.
An example:
MacEdition : Features: : June 26, 2003
02-23-2009, 03:27 AM   #11
Veteran Member
roentarre's Avatar

Join Date: Oct 2006
Location: Melbourne, Australia
Posts: 11,794
Moved to Post processing section.
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!
photography, photoshop, positive
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Travel Cambodja, now the positive side bymy141 Post Your Photos! 17 04-21-2010 01:58 AM
Very positive K-x review again gazonk Pentax News and Rumors 9 03-29-2010 05:10 PM
be positive axl Monthly Photo Contests 0 06-09-2009 03:46 PM
be positive... axl Post Your Photos! 8 05-07-2009 09:39 AM
Almost Positive about FF Pentax...I think... benjikan Pentax News and Rumors 184 06-08-2008 03:56 AM



All times are GMT -7. The time now is 07:46 AM. | 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