Scanning is a great way to make digital files of your physical negatives.
I’ve been scanning my negatives for a few years now with an Epson V600 scanner, and it works great. But sometimes the scanner renders the scans a bit soft where they look out of focus even if the photo itself is sharp.
Whether this is an issue with the scanner glass or just the way it renders the image, I wanted to find a way to sharpen my film negative scans while keeping the natural look of the film.
Sharpening Film Scans with the Scanner vs. Photoshop
For a while, I was using the default “unsharp mask” in the scanner software settings. It’s essentially a sharpening filter that is applied by the scanner directly to the scan.
While this did make my film images sharper (and was more than sufficient for the purposes of posting film photos on social media), once I started trying to print photos of my digital scans, I didn’t love the way the unsharp mask rendered the grain of the film.
To me, it looked harsh and a bit too much like a digital simulation trying to be what grain actually looks like.
I’m not very savvy in Lightroom or Photoshop, and after a few unsuccessful searches through online forums, I decided to go to my film guy at the local camera shop for advice.
“Oh, high pass,” he said without skipping a beat in response to my question.
He went on to explain that “high pass” is essentially a filter that can be applied in Photoshop for sharpening photos. He explained how to use it, and it seemed pretty simple, even for a Photoshop newbie like me.
So I went home, followed his instructions to sharpen my film scans and was actually very pleased with the results. I was looking for a subtle change, but for those who want a bit more sharpness the high pass filter gives you that option, too.
So here’s how to use the high pass filter in photo shop to sharpen your film negative scans!
As I said, applying the high pass
filter in Photoshop is pretty simple. Here’s how to do it:
1. Open in Photoshop
Open your negative scan (scanned without the scanner’s unsharp mask) in Photoshop, and make any other edits to your photo that you were planning to do (contrast adjustments, spot touch dust/hairs, etc.).
2. Copy Background Layer
Create a copy of the background layer in the layers menu. Do this by right clicking on the background later in the layers dropdown menu and click “duplicate layer” (or CTRL+J on Windows or Command+J on Mac).
3. Apply High Pass Filter
With the duplicate layer selected, click on “Filter” on the top menu bar.
In the drop down menu click “Other” and then “High Pass.” Your image should turn a color close to middle grey, with a faint outline of the edges in your image.
This will allow you to see the effect of the filter as the outline of your image will get more prominent as you increase sharpness.
4. Adjust High Pass Filter
A small dialog box will appear with a magnified preview of your image and a slider that reads “Radius: __ pixels.” The more you increase this number, the more you increase the sharpness of your image.
I was looking for a pretty subtle change in sharpness, so anything between 0.5 and 3.0 pixels is enough in my opinion.
If you do too much, it will create ugly halos and distortions in your image, so keep that in mind.
Once you have set the number, click “OK.”
5. Blend Layers
Your image should now appear as grey, with a black outline of the image itself. Now, you need to blend the two layers to get the final image.
To do this, go back to the layers panel, and on the dropdown menu, which says “normal,” click “overlay.”
This will blend the two layers and give you your sharpened image. You can also toggle between the sharpened and unsharpened layer by clicking the eye symbol beside the duplicate layer.
Hopefully, this is helpful if you haven’t been happy with how your negative scans are turning out. I like this technique because it’s simple and gives you a lot of control.
I was looking for a very subtle change in sharpness (I don’t mind a softer look), but you can experiment to get the look you want.
Please share your tips for sharpening negative scans if you have any!