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High resolution scan ?

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High resolution scan ? Philip Louw 04 Apr 08:16
  High resolution scan ? John Cupitt 04 Apr 11:13
Philip Louw
2006-04-04 08:16:42 UTC (almost 18 years ago)

High resolution scan ?

Hi,

I have an idea, It might be done already or not feasable at all. Scanning a orignal image(Painting/drawing) the maximum resolution is dictated by the scanner hardware.
Would it be possible to create a function where the image is moved slightly between multiple scans.Besause the allignment of the original to the sacnning device changes different image data would be picked up. And then have the information off these multiple image files combined to create a higher resolution image.

I think that the same type of logic that is used in sewing overlapping pictures together for creating panoramas could be used .

-- View this message in context: http://www.nabble.com/High-resolution-scan--t1391299.html#a3739203 Sent from the Gimp Developer forum at Nabble.com.

John Cupitt
2006-04-04 11:13:52 UTC (almost 18 years ago)

High resolution scan ?

On 4/4/06, Philip Louw wrote:

Would it be possible to create a function where the image is moved slightly between multiple scans.Besause the allignment of the original to the sacnning device changes different image data would be picked up. And then have the information off these multiple image files combined to create a higher resolution image.

Yes, this technique is usually called "superresolution", for example:

http://www.soe.ucsc.edu/~milanfar/SR-Software.htm

I have an idea, It might be done already or not feasable at all. Scanning a orignal image(Painting/drawing) the maximum resolution is dictated by the scanner hardware.

For oil paintings, the smallest features are the hairline cracks in the paint surface at around 0.1mm. So there's no point going beyond about 20 pixels/mm, or about 600 dpi. This is easy to achieve with conventional lenses and large-format cameras.

The other factor is reproduction. What are you going to use all that detail for? At 600 dpi you can make a high quality 2x lifesize print. How often do you need to print larger than that?

John