Quantcast Scanned images have 'stepped' curved lines - digitalFAQ Forum
  #1  
04-30-2017, 07:32 AM
Streetsomersetfella Streetsomersetfella is offline
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I've recently been sent some images for cleaning up prior to being used in high-quality with printing. However I've noticed that curved edges in the images are not smooth but are made up of a series of 'steps'. See attached screen grabs.

Does anyone know how these might have been generated? The original scans were at 400dpi (annoyingly in Index Color space instead of grayscale). I believe they were done on an Epson flatbed scanner.

Anyone have any idea?


Attached Images
File Type: png Screen Shot 2017-04-30 at 12.57.13.png (74.3 KB, 6 downloads)
File Type: png Screen Shot 2017-04-30 at 13.03.37.png (98.4 KB, 6 downloads)
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  #2  
04-30-2017, 07:41 AM
Streetsomersetfella Streetsomersetfella is offline
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Found it!

The original scans were fine. However, if I tried to straighten the image (wonky horizon etc) while still in Index Color space, the stepped effect appears. If I convert to Grayscale first and then straighten, there isn't an issue.

Hope that proves useful to someone else out there!
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