Announcement

Collapse
No announcement yet.

Fill-Flash/Backlighting: what's it doing

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • Fill-Flash/Backlighting: what's it doing

    Fill-Flash and Backlighting work well in a number of situations. I thought at first they were simple gamma adjustments that could be done in Levels, but they seem somewhat more sophisticated.

    Do you have any inkling as to what they are doing exactly? Are they applying an S-shaped Curves curve, whose shape is determined by the sliders? Knowing what's happening would help know when to use them and when to go straight to Curves.

    Thanks.

  • #2
    I guess by the number of replies no-one here knows the answer!

    However, as an experiment I created a new image consisting of two spectrum layers with difference blending (create a spectrum gradient; simplify the layer; duplicate it; and set the blending mode). This gives you a black image. Plalying with the fill flash enhancement by moving the sliders seemed to only effect the red and blue components.

    Using a black to white gradient gave expected (to me) results.

    Cheers,
    Paul.

    Comment


    • #3
      Actually, I somehow didn't see the question, and I'm a little tied up at the end of another book.

      You are looking at something like a midtone mask: the highlights and shadows tend not to be effected. If you make a Blend Mask of the midtones (curve 100% black at 50% and 0% at 0 and 100), you can make the adjustment using the mask layer set to Luminosity and the Levels (perhaps rather than curves--I've not done enough testing to be sure, but I think I am looking more at a masked linear behavior than a non-linear one).

      As I was not impressed with the saturation handling, I might do this all "manually" by making a Luminosity and Color separation and then using a Blend Mask for the midtones to use on the Luminosity -- but dropping the composite so the background is used as a fill source for the highlights. Perhaps a screen shot would help.

      http://hiddenelements.com/files/Picture_51.pdf

      This way, the midtone adjustment can be anything you want (Levels or Curves). The benefit of having the color separate is you can adjust that independently of the midtone adjustment, which it seems Adobe did not do.

      That help?

      Comment


      • #4
        For any full version users reading this thread...

        I have a small article on similar masking techniques:

        http://members.ozemail.com.au/~binar...litymasks.html

        I termed this the 'Endpoint Mask' - as it protects the highlights/shadows while revealing the midtones (or opposite if you invert the mask). A solarizing curve is applied to a luminance mask (see attachment).

        The layer option blend if sliders can also do this, without needing a mask!


        Regards,

        Stephen Marsh.
        Attached Files

        Comment


        • #5
          Stephen,

          There are limitation to access in the standard Elements interface, which includes Blend If. I created a work-around that I call Blend Mask, which is actually easier to implement, but has no direct access to the Blend If sliders.

          I encourage you once again to have a look at the program and book...some of the technique is not just transferable to PS, but useful in it.

          Hidden Power

          Comment

          Related Topics

          Collapse

          • Yumx2
            Using Mask????
            by Yumx2
            I dont know if this is the right section to post this!
            Im lookin @ several tutorials , and they are saying to select certain areas .. using mask.. I have no clue what a mask is , and how to select using this method. Could someone please explain to me what it is, and how to go about using them.....
            10-03-2006, 03:34 PM
          • 7890
            Help - I'm stuck
            by 7890
            Hi everyone,
            My favorite subject is my wife; however, her face (forehead) appears blotchy in all of her pictures. After in-depth reading and numerous attempts to correct this, I am still at a loss. The most I can do is lighten/darken to try to smooth and match, then a slight blur. Needless to...
            02-10-2006, 05:24 AM
          • dpnew
            Masking with tone(p. 88)?
            by dpnew
            I'm having trouble understanding the meaning of what's going on in the steps for setting up the blue midtones of an image for adjustment. I just had a bit of a revelation when I was examining the names of the layers in figure 3.33, and now I realize that the steps separate the blue channel into two...
            12-28-2003, 03:04 PM
          • inskip
            Introduction and Selective exposure correction
            by inskip
            Hi there!

            I am a brand-newbie and this is my first posting. A little history, I studied photography in school but quit before finishing I went back for graphic design where I was introduced to Photoshop and realized that photography is what I really love. Right now I stay at home and...
            03-21-2005, 02:03 PM
          • Rexx
            Too many masks = ugly
            by Rexx
            I am sure every beginner has this problem, yet I cannot find any tips on it. I am probably not looking long enough or in the wrong places

            Here is my problem.

            I have an image detail that I need to mask, let us say it is too dark.
            Ok, I mask it using a contrast...
            04-04-2004, 10:44 PM
          Working...
          X