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FORUMS Post Processing, Marketing & Presenting Photos RAW, Post Processing & Printing 
Thread started 10 Aug 2004 (Tuesday) 09:51
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"Contrast Control" Tutorial, (sort of)

 
PhotosGuy
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Aug 10, 2004 09:51 |  #1

I suspect that the luminous-landscape one is better, but this is the one I used &, if nothing else, it will serve as a bad example! :lol:

So, you've got an image of a polished aluminum aircraft in the bright sunlight, & half the pic is blown out.
I started with this Tut: Adjustment layer basics (external link)

Another way to do it is on:
http://www.luminous-landscape.com …/u-contrast-masking.shtml (external link)
This one says, "# Use Gaussian Blur to reduce resolution degradation of the image by the mask, yet at the same time avoid halos on sharp contrast boundaries such as skylines. (Filter / Blur / Gaussian Blur). Low amounts are usually best."
Well, I read that after I processed the pic using the first Tut, & you can see the halo around the prop & top of the cowling. In 'Step 4', I used a 10 pixel radius for the blur, & should have noticed that!

Here's a look at the two different exposures extracted from RAW. If I remember correctly, The 'under' one was -2.0 & the 'over' one was +0.5. Getting 'over' was easy, so I used the pilots head as a guide to set the exposure.

IMAGE: http://img.photobucket.com/albums/v218/PhotosGuy/Forum%20Junk/P-47_comp_0325.jpg

The final image:
IMAGE: http://img.photobucket.com/albums/v218/PhotosGuy/Air%20Show%202004/P-47_0325.jpg

Not perfect, but better than what I had.

A gallery of two pages of pics here:
http://img72.photobuck​et.com …tosGuy/Air%20Sh​ow%202004/ (external link)

The first post of the "$2,000,000 Lawn Mower! (Air Show)", pics is here, with pic info, etc.

UPDATED 11/4/04
In ran across "Adobe digital photography white papers and primers" at:
http://www.adobe.com …limag/ps_pro_pr​imers.html (external link)

The "Highlight Recovery in Adobe Camera Raw" on that page gives a much more detailed tutorial on contrast control using a different method of selecting the highlites. This is a 'must read'.
by Jeff Schewe
"The best digital cameras have about the same dynamic range as transparency film, but with Adobe Camera Raw you can actually process your raw images to pull out more highlight detail than you may have thought possible."

EDIT 3/21/05: I found another one. It's a lot easier & seems to bring details of darker pics as well as have applications to blown pics, too. If I remember right, you'd use Screen Mode for the overexposed ones. Any way, have fun. You'll learn something either way! ;)
Blend modes for Contrast Masking:
http://www.luminous-landscape.com …ls/contrast_mas​king.shtml (external link)

More on Blend Modes:
Photoshop's Five Essential Blend Modes For Photo Editing (external link)

FrankC - 20D, RAW, Manual everything...
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Scottes
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Aug 10, 2004 10:26 |  #2

This is the third time in a week that someone has fixed a photo doing this type of thing. Something's telling me that I have to go back and fix a couple of old waterfall pics with similar problems. I gave up on them a long time ago, but 3 times in a week....

Thanks Frank. I've got to check this out.


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slejhamer
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Aug 10, 2004 10:53 |  #3

Excellent example Frank.

Here is a link to a PS action that makes much of the work automatic, as long as you have your two exposures open:
http://www.outdooreyes​.com/photo80.php3 (external link)


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PhotosGuy
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Aug 10, 2004 16:51 |  #4

Thanks for the link, slejhamer. I'll give it a try.
This whole process didn't take very long to do, but if a person has a lot of blown images. it will come in handy! :wink:


FrankC - 20D, RAW, Manual everything...
Classic Carz, Racing, Air Show, Flowers.
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Have you thought about making your own book? // Need an exposure crutch?
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Pekka
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Aug 10, 2004 16:59 |  #5

Another way is to convert two exposures from RAW and use clone tool to move data from "highlight-saved" to normal exposure" image, working only on the areas where highlights were blown on normal exposure. This is very easy and no masks are needed.


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PhotosGuy
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Aug 10, 2004 17:12 |  #6

move data from "highlight-saved" to normal exposure"

Do you mean "highlight-saved" as in save a History & paint with the History Brush?
Please tell us more, Pekka!


FrankC - 20D, RAW, Manual everything...
Classic Carz, Racing, Air Show, Flowers.
Find the light... A few Car Lighting Tips, and MOVE YOUR FEET!
Have you thought about making your own book? // Need an exposure crutch?
New Image Size Limits: Image must not exceed 1600 pixels on any side.

  
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edmund
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Aug 11, 2004 12:46 |  #7

Pekkas's suggestion

how do you make sure when you are cloning from one image to another that you start 'painting in' at the exact same spot? do you zoom in to 300% or is there some 'trick' to make sure you get it right? I really like your idea .... but could you fill in a couple of steps, please.




  
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Pekka
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Aug 14, 2004 16:19 |  #8

Develop normal exposure version (A).
Develop version which has highlights saved (B)

When you have them open in PS, ALT-click with clone (stamp) tool anywhere in photo B. See you coordinates from info toolbox.

Click photo A in exactly the same coordinates and now you have "locked" the clone tool between shots.

You can freely paint stuff from photo B to photo A, namely areas which need highlight saving - you can use all the facilities of the tool (transparency, brush size etc). You can also you history tool to revert back.

I have used this technique in photo below to paint a "better exposure of an explosion" from a picture taken 1 second apart, only the top right part (one treetop, explosion) is transferred.

IMAGE: https://photography-on-the.net/stuff/HV8O0192_1b.jpg


This shot was one of the hardest I've been ever asked to do, as there was no rehearsal and exact timing and brightness of explosions was unknown - it was quite dark so I knew I could not hold all the dynamic range so this way I could get good detail to explosion and have good low noise version of the rest of the shot.

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PhotosGuy
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Aug 15, 2004 13:01 |  #9

That's interesting! I've never considered cloning from one pic to another.
Is there an advantage to doing it that way?

I would have just dragged one pic into the other, saved a history, painted in the details & deleted the other pic layer.
Of course, that's one of the great things about PS. There are often several ways to get the same end result!


FrankC - 20D, RAW, Manual everything...
Classic Carz, Racing, Air Show, Flowers.
Find the light... A few Car Lighting Tips, and MOVE YOUR FEET!
Have you thought about making your own book? // Need an exposure crutch?
New Image Size Limits: Image must not exceed 1600 pixels on any side.

  
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tommykjensen
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Aug 15, 2004 13:23 |  #10

There is also a dynamic range plugin from Fred Miranda that can do it all automated given the 2 images. Its called DRI Pro.


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PhotosGuy
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Nov 04, 2004 08:58 |  #11

I found a Adobe Whitepaper page which gives a much more detailed tutorial.
See the UPDATED 11/4/04 info in the original post.


FrankC - 20D, RAW, Manual everything...
Classic Carz, Racing, Air Show, Flowers.
Find the light... A few Car Lighting Tips, and MOVE YOUR FEET!
Have you thought about making your own book? // Need an exposure crutch?
New Image Size Limits: Image must not exceed 1600 pixels on any side.

  
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PhotosGuy
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Mar 07, 2007 12:01 |  #12

More on LAYER MASKS:
This isn't as good as using two different exposures, but a Layer Mask is fast & easily reversible. Give it a try on an old shot: Airport runway shoot

More Layer help: Layers, Layers, Layers (external link)

Layer Masks - What the Thumbnails mean (external link)

Layer mask in Elements 4.0
https://photography-on-the.net/forum/showthre​ad.php?t=237985

Adjustment layer basics
http://www.adobe.com …tutorials/adjla​yerbasics/ (external link)

About layer and vector masks (external link)

LM in Elements & other uses (external link)

Selecting areas in PS.


FrankC - 20D, RAW, Manual everything...
Classic Carz, Racing, Air Show, Flowers.
Find the light... A few Car Lighting Tips, and MOVE YOUR FEET!
Have you thought about making your own book? // Need an exposure crutch?
New Image Size Limits: Image must not exceed 1600 pixels on any side.

  
  LOG IN TO REPLY
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"Contrast Control" Tutorial, (sort of)
FORUMS Post Processing, Marketing & Presenting Photos RAW, Post Processing & Printing 
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