How do labs expose scans of intentionally overexposed foggy negatives?

Question

I photographed a very bright foggy scene on color negative film and intentionally gave extra exposure so the fog would stay bright instead of being rendered as middle gray. After lab scanning, the files came back darker and muddier than I expected.

When a lab scans negatives, does the scanner or software effectively normalize each frame toward a middle tone, similar to how a camera meter would? Or are scans usually done with fixed settings for a film stock so that bright scenes stay bright and dark scenes stay dark?

The lab told me each image is judged individually during scanning, but that seems subjective unless the operator knows the intended look. I was aiming for a bright, airy rendering.

Is this likely a scanning issue rather than exposure on the negative? And what is the best way to correct a foggy negative scan that looks too dark or muddy?

user75526 · Accepted Answer

Does anyone know how I could fix this picture?

Increase gamma/exposure by a half stop (or however much you like).
Auto levels on a separate layer with color blending to correct the color cast. Some programs use temperature and tint to adjust white balance.
Any other levels/curves adjustments to taste. Some programs have shadows, midtones, highlights adjustments, which are just another way to work with curves.

... a human judges the brightness of each picture individually while scanning.

That's doubtful. More likely, a computer auto adjusts the images. Then a human quickly checks thumbnails for obvious errors. The image you have would be left alone because it looks like what it is, a foggy day.

To minimize operator effort, each image is probably auto adjusted independently of others. The same setting for an entire roll wouldn't work well because people don't expose every frame perfectly. You can ask the lab if they're willing to show you their scanning process. (I didn't pay close enough attention to this detail when my local lab showed me their process.)

Now the images I got back from the lab are much darker than I wanted them...

It's darker because the computer/operator can't read your mind. If you have special instructions for the lab, you need to provide them ahead of time. You might also need to pay for editing services.

The basic scans that labs provide are just a starting point for you to do your own editing. You can screen the lab scans for images to digitize and process yourself. If you have a reasonably good digital camera, you can use a slide copier.

See Using a 35mm Slide Copier with a Crop Sensor.

How do labs expose scans of intentionally overexposed foggy negatives?

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