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Red 35mm Slide - How to Color Correct?

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  #1  
Old 09-19-2006, 02:38 PM
lamboe80 lamboe80 is offline
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Red 35mm Slide - How to Color Correct?

My grandmother has hundreds of old 35mm slides that she has asked me to scan for her. I've discovered that almost every slide is overpowered with red. I have been able to successfully color-correct everything up until now. This slide is giving me fits, so I thought I would see if anyone here can help out. I've tried curves, color balance, and all of the other steps that I've used on the other slides I've corrected. I think this will require editing the channels, and I have no experience in doing this. Can anybody help?
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File Type: jpg Red35mmSlide.jpg (71.8 KB, 109 views)
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Old 09-19-2006, 02:49 PM
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Doug Nelson Doug Nelson is offline
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Instead of editing channels, try using a levels adjustment layer. Keep it open and set the dropdown to red, then hold down the alt key and drag in the white and black sliders until you can just see detail starting to show. Then repeat with blue and green (all with the dialog still open). Then go back to each channel while you're looking at your image on the screen and move the middle slider. Once you get this zeroed in you can just drag that adjustment layer over to another open image and it will be automatically applied.

(I'd be obliged if someone would write this up for our Tutorials section)
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Old 09-19-2006, 04:14 PM
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Cameraken Cameraken is offline
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Hi Lamboe80

Doug’s method works great for the colour but it introduces a lot of chroma noise.

I used the black channel for the luminosity, Sharpened it and evened out the exposure corners.

There is still some painting to do to paint out the noise.
I used blank layers set to color to paint

If you want the numbers, just ask

Hope this helps.

Ken.
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File Type: jpg Ken_Red35mmSlide.jpg (95.5 KB, 107 views)
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Old 09-19-2006, 04:18 PM
lamboe80 lamboe80 is offline
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Thanks Ken! That's loads better than I was able to do. Could you give a few more details though?
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Old 09-19-2006, 05:29 PM
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mistermonday mistermonday is offline
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Ken, nice job. However, hand painting a ton of images will be very time consuming. This image is particularly challenging because if you examine the Green & Blue channels there is virtually no data. Most of the pixels are dead 0 (black) and what data is there tops out around 30. Levels and curves won't cut it because all they will do is introduce random noise. So the approach I took was to bulk rebuild the G&B channels.
- Using Apply Image, apply the green channel to itself inverted and 50% opacity.
- Same for the Blue channel.
- Phot filter layer next to get a skin tone balance.
- A little blue and green color fell in by default
Now you can leave as is or do some selective painting or toning.

Lamboe80, I hope all of your slides are not this bad. Did you use a flatbed scanner w/ adapter or an actual Slide scanner with a high dynamic range?

Regards, Murray
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File Type: jpg Lamboe80 rev MM.jpg (99.7 KB, 72 views)

Last edited by mistermonday; 09-19-2006 at 06:19 PM.
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Old 09-19-2006, 05:31 PM
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Doug Nelson Doug Nelson is offline
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I suspect if you try my technique on the fullrez scan, you won't have the noise problem.
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Old 09-19-2006, 08:06 PM
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Cameraken Cameraken is offline
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Hi Lamboe80

Thanks for your comments.

I realise you have a lot of these and Murray’s method may be better. It just depends how much you want to do.

I split the job into two parts. One part to get the luminosity (B&W) and another to get the colour.

I opened the image and duplicated it. I converted the duplicate to CMYK

On the RGB Image

I Adjusted levels as Doug suggested. I used these numbers
Red 29 0.77 224
Green 0 3.23 49
Blue 0 1.36 74

This improves the colour but introduces a lot of chroma noise (green spots)

On the CMYK Copy

I copied the Black Channel to a layer
Adjusted Levels
Added a layer set to Overlay and painted in white to adjust the exposure in the corners of the picture
Sharpened
I then copied this Black layer back to the RGB image and set the blending mode to luminosity


We now have an image with colour from the levels adjusted RGB and the luminosity from CMYK Black.


I added layers to paint out the green Chroma Noise and improve the colours


That’s about it. You may also like to try Neat Image to reduce the noise even further.

I hope this helps. I have attached my layers. I am sure most of this could be made into an action and as Doug has mentioned the noise may not be as bad in a hi-res copy.



Ken.
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File Type: jpg Ken_Layers.jpg (98.5 KB, 52 views)
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  #8  
Old 09-20-2006, 08:20 AM
lamboe80 lamboe80 is offline
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Lots of great tips here everybody. thanks for your efforts.

Murray: Yes, the green and blue channels are severely damaged. they have faded away almost completely. That is what is giving me the most fits. I like your approach, and I will give it a try.

Doug: I tried your approach on the full rez version and still got dreadful results. Your approach works perfectly on all of the other images I have with the red cast. This slide in particular just isn't cooperating.

Ken: Thanks for your detailed explanation. I'll try your approach as well.
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  #9  
Old 09-20-2006, 09:57 AM
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Flora Flora is offline
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Hi,

working with the size and resolution of the image posted, to prevent the chroma noise Ken was talking about, I 'edited' the green channel which, in my opinion, was the worst of the lot..).

Here are the 3 steps I took to get to an 'acceptable' result:

(Working on a duplicated background Layer)

1* Duplicated the Red Channel, run Levels on the duplicate to improve tone and contrast a bit, copied it and pasted it on the damaged Green Channel. (Attachment 1)

2* Back to the Layers, (Attachment 2) I used a Levels adjustment Layer (tweaking composite RGB and Blue) on the 'horror' achieved with my previous 'correction' .... B&A Levels (Attachment 3) ....

3* To correct the colours, I used a Selective Colors Adjustment Layer with the following values:

Reds:
Cyan +65
MAgenta -31
Yellow +38
Black -24

Yellows:
Cyan -27
MAgenta +8
Yellow -31
Black +28

Magentas:
Cyan +42
MAgenta -100
Yellow +81
Black -23

Whites:
Cyan -9
MAgenta -15
Yellow +43
Black +7

Neutrals:
Black -18

Blacks:
Cyan +7
MAgenta +1
Yellow +19
Black -9

Result after Selective Colors (Attachment 4).

After this, it's a matter of how much or how little you have time to do to finish the restoration... (Attachment 5 > my final restoration)
Attached Images
File Type: jpg SNAP-163a.jpg (67.5 KB, 43 views)
File Type: jpg SNAP-164.jpg (82.0 KB, 32 views)
File Type: jpg SNAP-165.jpg (78.2 KB, 40 views)
File Type: jpg SNAP-166.jpg (36.9 KB, 64 views)
File Type: jpg F_Red35mmSlide.jpg (97.5 KB, 98 views)
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  #10  
Old 09-20-2006, 11:58 AM
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mistermonday mistermonday is offline
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Flora, AWSEOME!! You are still the Godess of Color Correction.
Regards, Murray
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