[Play_RAW] Scans from old negative film > heavy color cast

play_raw

#1

Hope I am not off-topic here. It’s not really a Raw Play thing, it’s more about saving old negatives film.

Film is about 20 years old. Somehow it lost lots of blue. I scanned it with a Nikon Coolscan without any color correction. This is what it looks about:

Here a link the 8bit TIF (~65Mb)

https://drive.google.com/open?id=1jDrJ9sXbevF65z3Q1KPiWD9GXEgxHKA3

What I did in Darktable was using Tone Curve > Lab Channels > Set the white point in the Lab B (the surfboard) to the center line, and kept a straight line.

That makes the image look a bit more normal. Still, no blue sky.

What I look for is basically to get ‘okay’ with a few clicks. I am aware that one can do much more, but I have a about 1000 images to scan and my aim is not perfection here. A believe the quality of the negatives has quite deteriorated over the the last 20 years, so my expectations are not that high. And some are way worse than this one.


#2

Nice image. Please license your image; see: PlayRaw stuff to keep in mind.


(Boris Hajdukovic) #3

Hi @st.raw,

you can use color balance module to remove color cast quickly. As in your example above, you can use the surfboard surface as a reference. Choose color picker for hue from highlights : gain/slope and mark an area on the surfboard. Result:

Additionally you can use the color correction module to make further corrections. To my taste, the warmer dark tones look most pleasant for this picture:

By the way, I don’t think the sky in this picture is blue. To me it seems to be rather cloudy. This can be also seen from the fact that there are no strong shadows in the rest of the picture.


#4

,

Image11_01.tif.xmp (12.8 KB)


#5

@yteaot Nice. What is your general methodology here, as I am away from the computer.

@st.raw Old negative film only kept its color for a few years. New film colors will last for decades. Magenta fades the slowest. The compliment of magenta is green. So your positive result will be very green. And it is. The cyan and yellow fade faster than magenta and at different rates. The result is a major color imbalance. I’ve mostly scanned Kodachrome slides and have seen no color degradations after 40+ years, so I’m relatively inexperienced at the color rebalance methods.


#6

Image11.tif.pp3 (13.0 KB)
Image11-1.tif.pp3 (14.0 KB)


#7

-First Colorbalance / neutralize colors.
Then Color Zones / almost all the colors off but keeping some red
-Then repaint with color look up table + mask. Separately green forest, bluish water and sky
-Repair with retouch edge on left bottom and white dock
-Some adjustments with filmic and crop and rotate

I don’t know what the original colors were like. I chose the colors that seemed to fit the picture’s condition. So I did not try to restore colors, I made new ones


#8

second version with less magenta skin tones, mainly rgb curves and channel mixer :slight_smile:
Cropped with a 16:10 ratio

Image11.tif.pp3 (13.3 KB)


(Thomas) #9

@yteaot, really impreessive what you did!

I just tried to do some general corrections.


Image11.tif.xmp (4,0 KB)


(Shreedhar Inamdar) #10

Hello @st.raw. If I undestand correctly, you need a quick solution (a click or two long) for restoring your slides. Since the original color seem to have degraded considerably, may I suggest that you keep them in B&W form and the ones that are really special can be looked into restoring in color. Here is my three click solution using RawTherapee 5.5.
1.Turn on the Black and White module
2. Turn on Local contrast module.
3. Turn on Haze Removal module.
You get this:


(Alberto) #11

This was fun, thanks for sharing! Here’s my take…


#12

Thanks for all replies. Interesting to see the different approaches. My comments:

@st.raw
20 Second fix, but there is more in it.

@s7habo
I need to look into that. Interesting approach.

@yteaot
Saturations seems a bit low but I really like the tonality. Quite a lot of steps though. Need to study that further too.

@hiram
That scan isn’t that bad. I have worse, much worse.

@age
Similar colors to @yteaot, which I really like a lot. I don’t really use Rawtherapee, had to look up what pp3 is associated with. Can’t saw much yet, but the menu looks much better organized. I love that one can see what module is on/off instantly. Update: Tried your method with Darktables Channel Mixer - so far failed. DT’s Channel Mixer is really user unfriendly compare to RT. Very confusing and easy to delete what you’ve done when you switch off a channel (will instantly disappear from the pipe and not come back) - One more try: Using the Channel Mixer for each color individually seems impossible.

@Thomas_Do
You sort of set a negative curve in Lab B. Interesting. Very effective.

@shreedhar
I love b&w, mainly for artistic reasons. My scan doesn’t really qualify for that. As long as I can try to squeeze some color out of it I will try that.

@agriggio
Very impressive. Can you post the side car file please?


#13

@st.raw I generally like @age’s handle on colour. Getting skin right is pretty important.

I don’t have a colour managed workflow and my screen is old and low quality, so I am not confident in processing the image. :blush:


(Alberto) #14

I’m afraid I don’t have one that can be useful, sorry. however, the bulk of the work is done with a channel mixer, which is available in many programs. that will get you 70% there. the rest are more local tweaks and a global increase in contrast and saturation. if you want something quick that can be applied in batch, I think that channel mixer alone would give some decent starting point


(Todd Prior) #15

One click …Photostylizer filter in Google’s free Color Effects module of NIK…could be tweaked and saved as a recipe for your batch edit


(Todd Prior) #16

I think the options were Varitone and applied at maybe 20ish percent