Tech tip1 min read
Why a Photographic Resolution Target Is Not Suitable for Scanning
Micrographic control targets are designed for photography, not scanning; scanning them causes digital aliasing, so use document scanning targets.
Film image quality cannot be monitored by passing a Micrographic Control Target through a scanner and then writing it to film. These targets are designed for photography, not scanning.
Highlights
- If the detector size (CCD pixel) is equal to or larger than the target line width, less information is captured
- Digital aliasing then occurs, and the scanner artificially reconstructs edge detail of lines or text
- Scanning targets designed for documents (Document Scanning Targets) should be used for document scanning
Source:Eastman Park Micrographics(epminc.com)(opens in a new tab)
Frequently asked questions
Why can't a Micrographic Control Target be used to monitor film image quality during scanning?
Because Micrographic Control Targets are designed for photography, not scanning, so passing them through a scanner and writing to film cannot monitor film image quality.
When does digital aliasing occur when using a CCD scanner?
Digital aliasing occurs if the detector size (CCD pixel) is equal to or larger than the target line width, so less information is captured.
What effect does digital aliasing have when scanning a photography target?
The scanner artificially reconstructs edge detail of lines or text.
What type of target should be used for document scanning?
Document Scanning Targets should be used for document scanning.
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