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35mm Slide - Green/Blue Colour Cast ?

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  #1  
Old 01-18-2011, 04:03 AM
Dave... Dave... is offline
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35mm Slide - Green/Blue Colour Cast ?

Even with iCorrect OneClick (quite good) and SmartCurve I'm struggling to rectify the cast in this 1960s 35mm slide (reduced size here). I'm using Photoshop v7.

The trouble seems to be with the colour of the brickwork - visually, the photo looks like it has a green cast, but SmartCurve suggests too much blue.

Any ideas would be much appreciated.

Dave.
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File Type: jpg Dave Slide.jpg (96.6 KB, 119 views)

Last edited by mistermonday; 01-18-2011 at 08:42 AM.
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Old 01-18-2011, 07:39 AM
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Re: 35mm Slide - Green/Blue Colour Cast ?

Here's a quickie ....
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File Type: jpg 35mm Colour Cast.jpg (90.9 KB, 94 views)
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Old 01-18-2011, 08:36 AM
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Re: 35mm Slide - Green/Blue Colour Cast ?

mistermonday/Repairman

Many thanks - that's useful.

The brick is perhaps paler than expected (I've tended to over-compensate) - this is it more recently:

Google Streetview today

Dave.
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Old 01-18-2011, 08:44 AM
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Re: 35mm Slide - Green/Blue Colour Cast ?

I used curves to correct the color. I used the eyedroppers only. The black point was the front of the car located in the bottom right of the photo. The white point in the center and the gray point on the stone towards the left of the photo
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File Type: jpg Cast.jpg (140.6 KB, 57 views)
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Old 01-18-2011, 08:47 AM
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Re: 35mm Slide - Green/Blue Colour Cast ?

Hi Dave, pl;ease accept my apologies, I went in to edit my text and end up erasing my post and accidentally deleting part of yours. I restored your. I will redo mine later this afternoon as I am just going into some mtgs.
FYI, your attachment was very compressed, and understandably pixelated and has lots of color noise. Restoring color will be much on a higher quality image.
Regards, Murray
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Old 01-18-2011, 10:29 AM
Dave... Dave... is offline
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Re: 35mm Slide - Green/Blue Colour Cast ?

philbach - many thanks for the info.

Murray - no problem.

Dave.
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Old 01-18-2011, 11:35 AM
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Re: 35mm Slide - Green/Blue Colour Cast ?

I tried to measure a few different points in the image to maintain overall correct color.

For this I set up four color samplers, one in the greenery, one in the white concrete of the building, one in the (seeming) white car in front of it and one on the trunk of the tree.

Now I added a curves adj. layer and set curves so that the whites became neutral, the green became green (green a little higher than red, blue the lowest) and the trunk became of a yellowish brown (red the highest, green in the middle, blue the lowest).

Next I set this layer to "Color" mode and added a new curves adj. in "Luminosity" mode to get the contrast right and as a last step I increased the saturation a little with a Hue/Saturation adj. layer.

I also added a black & white adj. layer to neutralize the shadows a little as I thought they were getting a little too warm.
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File Type: jpg cast.jpg (93.4 KB, 55 views)
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Old 01-18-2011, 11:48 AM
Dave... Dave... is offline
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Re: 35mm Slide - Green/Blue Colour Cast ?

Der_W - many thanks. I think "the (seeming) white car" (with the black roof) was a light grey, i.e., the Austin A40.

Dave.

PS I've noted the use of 'blur average' for rectifying colour casts, but unfortunately it doesn't feature in PS7 - does anyone know of a workround ?
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Old 01-18-2011, 01:49 PM
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Re: 35mm Slide - Green/Blue Colour Cast ?

Dave, I took the quick route and just ran Kodak's Digital ROC filter to see what it would do. It did neutralize the cast to some extent. The sample you attached is pretty pixelated and contains a lot of color noise so there was not much point playing with it too much. However, with a hi res scan you should be able to do a pretty good job color correcting the image.
Regards, Murray
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File Type: jpg Dave Cast MM.jpg (187.7 KB, 57 views)
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Old 02-05-2011, 04:03 AM
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Re: 35mm Slide - Green/Blue Colour Cast ?

I could do with Murray's leaves ! I've tried to add some warmth to the brickwork (only partly successfully, below), via an inverted 'a' channel, with 'soft light' blending:

Photoshop Tutorials - Photo Effects
http://photoshoptutorials.ws/photosh...oto-boost.html

But looking at the CMYK version of the original suggests a major deficiency in the yellow content - it's faded and the histogram content is appreciably compressed towards the middle.

Standard level/curve adjustments (adjusting the shadow/neutral/highlight points) aren't sufficient, e.g., as a longshot, I tried the curves suggested below for an earlier Agfa slide, but with no real success:

Photo.net - Agfa colour slides from 1938
http://photo.net/bboard/q-and-a-fetch-msg?msg_id=006myF

Also, according to a number of postings on the web, Agfa slides can be especially problematical to correct.

I'm now wondering whether the brickwork and leaves each need masking to new layers, with some selective colour adjustment applied ?

Dave.
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File Type: jpg 35mm Colour Cast - Y+Lab adj.jpg (94.1 KB, 30 views)

Last edited by Dave...; 02-05-2011 at 04:12 AM.
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