Why can film scans look brighter than digital shots made with the same exposure settings?
Asked 6/22/2016
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I shot the same scene on a Canon 5D Mark III and a Canon EOS 500N using the same Canon 50mm f/1.4 lens and matching ISO, shutter speed, and aperture settings. The film was developed and scanned by a lab, and the digital files were shot in RAW, opened in Adobe Camera Raw, and saved as JPEG.
In both my black-and-white and color examples, the scanned negatives look noticeably brighter than the digital images, even though the camera settings matched. Is this due to film ISO being different from its box rating, development/scanning, metering differences between the cameras, or does negative film simply render tones differently than digital?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
10y ago
2 Answers
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Film is not brighter, it has different tone curve. In your examples highlights and shadows from negative are translated differently to the print than digital.
With traditional films like the HP5 the curve is S-shaped. Also, with the black and white example, each film has certain tonal response to different colors, your digital conversion to bw has a different one. This may cause difference in skin tones, for example.
If you want to get digital results that are closer to film, use some of the film emulating bw conversion plugins like Silver Effex.
It is also possible that the films came from the lab a bit overdeveloped.
Originally by user27944. Source · Licensed CC BY-SA 4.0
user27944
10y ago
0
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Negative film is not inherently “brighter” than digital, but it often looks that way because the whole imaging chain responds differently.
Main reasons:
- Different tone curves: Negative film and digital sensors do not map shadows, midtones, and highlights the same way. Film often has a more gradual highlight roll-off and a different overall contrast curve.
- Lab scan interpretation: A scan is already a translated version of the negative. Even with “no corrections,” scanner/software choices affect brightness and contrast.
- ISO differences: Box speed and digital ISO are not perfectly equivalent. Film makers and camera makers may rate sensitivity differently, so matching settings does not guarantee matching brightness.
- Metering differences: The two cameras may not meter the same scene the same way, even if the displayed settings match.
- Film-specific rendering: Black-and-white film can respond to colors differently than a digital B&W conversion, changing skin tones and tonal balance.
Overdevelopment could also make negatives scan brighter/denser, but the simpler explanation is that film, digital capture, and scanning each have different tonal behavior.
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