Luminous Landscape Forum
The Art of Photography => User Critiques => Topic started by: Eric Myrvaagnes on June 19, 2020, 11:48:42 am
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Dave (Isle of Skye) suggested a possible way of automatically getting PhotoShop to correct the color balance of some scanned Kodachromes from the Canadian Rockies I posted recently over in the Landscape Showcase thread ("Re: Looking back part 3: Canadian Rockies (1977-...)
« Reply #31 on: June 17, 2020, 01:37:50 pm »".)
My bad color vision has prevented me from making appropriate adjustments myself. So I chose a few scans that my wife (with good color vision) has complained about and tried Dave's suggested method. Here, and in the next three posts, I show before and after versions of four of the slides, and I invite comments on which member of each pair is better, and whether the better looks at all convincing.
The first pair is looking down on Lake O'Hara, and the second pair is the rock wall behind Floe Lake.
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Floe Lake Rock Wall:
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View north from Yuma Pass (near Floe Lake):
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Mountain goat, near Twin Falls:
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Eric, I'm looking at these on my workhorse editing desktop system which has everything including the cat's arse profiled and calibrated and the second version of all four are much improved.
As for convincing, well compared to the first version of each, a resounding yes!
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Hi Eric,
When I viewed your images in the original post, I didn’t realize you had colour vision challenges. I just assumed you wished to keep your slides the way they were previously edited (you had also mentioned some film processing mishaps). With this new info, many of the original images had a strong magenta tint throughout, and especially in the highlights. This new processing you have done is great and looks far more realistic. Love the new editing process!
The content of the photographs remains outstanding.
Cheers,
Mike
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Thank you Keith and Mike.
I will now go ahead and try the PS almost-automated procedure on all of my old slide scans.
I had an exhibit several years ago at a local library, and I brought a photographer friend to see it, and he remarked that my blue skies looked a bit magenta. They just looked blue yo my eyes, so i couldn't see how to fix them.
My one safety technique since then is that I never touch the color balance slider in LightRoom unless the image is sufficiently abstract that I don't care about color accuracy.
Mike's suggested technique is simple enough that I should be able to make a PS action to do it quickly. By the way, I am still using PS 6 (wno rental fees) and this works for me.
-Eric
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These are much more natural, Eric. Thank you to Mike for the great tutorial on creating or fixing colour balance.
I gave up on Kodachrome and got swept away by the Fujifilm tide of 'pop' colours. As I learned more, I tried to choose film with characteristics that best suited the subject. Green scenery definitely benefited from Fuji. But Ilfachrome was better for more pastel like colours, and so on.
JR
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Just to clarify: it was Dave (Isle of Skye) who made the processing suggestions that you employed here. I deserve no credit.
Cheers,
Mike
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Just to clarify: it was Dave (Isle of Skye) who made the processing suggestions that you employed here. I deserve no credit.
Cheers,
Mike
Ok. Thank you Dave (Isle of Skye)!
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As for convincing, well compared to the first version of each, a resounding yes!
+1
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I just made scans of over 10.000 slides, mostly from the 1980-2000
Some started to change colour already, others looked perfect.
It is a lot of work sometimes to get the colours right.
in this case the colours look more natural after the photoshop treatment.
I still have a lot of work to do.
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Just to clarify: it was Dave (Isle of Skye) who made the processing suggestions that you employed here. I deserve no credit.
Cheers,
Mike
Oops! My bad.
Thanks so much Dave!!
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Update: I have now replaced all of my Canadian Rockies images (in the Landscape Showcase forum) with ones reprocessed using an action built on Dave's suggestion. I have also added four more images that I forgot to include the first time.
Enjoy!
-Eric
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I'm still curious on how this works.
I've always used the eyedropper of White Balance in Lightroom when necessary. I assume that clicking on a neutral gray pixel this tells LR that that is "gray" and then LR corrects all other colours.
Now I tried this Ctrl+Shift+B thingy in PS and it does something, but the result is different.
In LR I'm telling the program what "gray is". I imagine that I can understand how it works.
In PS I'm just pressing keys, PS does everything for me. I don't know what criteria it uses.
Can anybody explain a little?
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That's a good question.
For me, with defective color vision, I can't be sure what gray might be neutral in a photo, unless I had included a neutral gray card when taking the photo.
I think Dave's explanation was roughly that PS looks at the brightest and darkest points in an image and assumes that they are white and black, and adjusts from there.
That suggests an experiment I might try: I'll set up a scene where the brightest is non-white (say, really light green, for example) and the darkest is a dark version of the same color. What will PS do to that? When I get around to doing that, I'll post the results here.
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The ability of digital cameras and of Photoshop (Camera Raw or Lightroom, which has Camera Raw built in) to handle white balance has improved almost beyond belief since I started doing digital 20 years ago. In most cases it's right on. Occasionally you need to instruct it with the eyedropper.
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But the eyedropper isn't reliable for those of us with deficient color vision. If I pick a spot that looks neutral to me, it may well have considerable magenta that I don't see.
I should carry the gray card with me more often...
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The other thing you can do, Eric, is pick a spot you know is white. Usually there are more of those than spots that are middle gray.
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I photographed a gray card (visitor unasked for :) )
I got the following readings in PS (Info RGB)
Photo 1 As Shot
Gray Card 155 157 175
White Wall 239 239 244
Photo 2 In PS Camera Raw - Eyedropper on gray card
Gray Card 175 175 175
White Wall 249 249 249
Photo 3 with Ctrl+Alt + B
Gray Card 159 159 174
White Wall 252 252 252
Photo 2 seems to be right
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The other thing you can do, Eric, is pick a spot you know is white. Usually there are more of those than spots that are middle gray.
My bad vision will still cause problems: How do I know a "white" wall isn't actually light green or light magenta?
Of course I could carry a small print that PS has guaranteed to be white.
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My bad vision will still cause problems: How do I know a "white" wall isn't actually light green or light magenta?
Of course I could carry a small print that PS has guaranteed to be white.
Why not carry 1/4 of a grey card with you (4x5)? That's small enough and guaranteed gray. The back is white
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Why not carry 1/4 of a grey card with you (4x5)? That's small enough and guaranteed gray. The back is white
I might try that the next time I get out with a camera, unless I have forgotten by then. :-\
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I might try that the next time I get out with a camera, unless I have forgotten by then. :-\
A friend of mine told me once.
"There are three things that I always forget:
1. The names of persons I meet
2. My wedding anniversary
3...…….third………third……….hmmm, I don't remember...:("
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:D