Haloes Surround Bright Areas

A scan of a high contrast film such as Kodachrome results in haloes around bright areas adjacent to dark areas:

Sailboat with halo caused by extreme contrast

Scan with halo around bright areas

Sailboat with contrast adjusted to make halo more visible

Contrast enhanced to make flare more visible


  1. This is flare, inherent to the CCD technology used by consumer scanners.  Flare is also present in the mid-tones as reduced pixel-to-pixel contrast.
  2. Dirty optical element

Remedies:  1. Decrease analog gain.  2. Create a mask of bright areas, perform scan of masked image, perform scan of bright areas, and composite scans.  Film masking   3. Use a drum scanner.  4. Clean optics

Comment: Unlike other types of flare, such as that caused by dirty optics, CCD flare varies with the scan traversal direction.  That means an image created with the traversal from a bright to a dark area will differ from that done with the traversal from a dark to a bright area.  Over aggressive use of analog gain can also aggravate flare.

I've found the LS-9000 to be a clear improvement over the LS-8000 and previous generations of scanners in controlling flare.

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