Scanners, Scanning and Scanography For RIGHT brained thinkers Presented to the Sequim PC User's Group Tom Pitre, December, 2009 First scan, 1957 - from a SCANNER in development at the U.S. National Bureau of Standards. Size – measured 5 sq. CM (@ .77 sq. inches)
Scanocity
Jan 20, 2015
A small powerpoint presentation that is mentioned in Scanocity is not available for upload. It demonstrates use of scanned image to design a structure. Not critical for understanding. tp, author.
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Scanners, Scanning and Scanography
For RIGHT brained thinkers
Presented to the Sequim PC User's Group
Tom Pitre, December, 2009
First scan, 1957 - from a SCANNER in development at the U.S. National Bureau of Standards. Size – measured 5 sq. CM (@ .77 sq. inches)
A Little Scanner Entertainment
Scanner plays music. Follow the link aboveat home.
http://www.youtube.com/v/jJgSraig-bU&hl=en&fs=1&
Cat Scan
How Does a Scanner Work?
Image is lit. Mirrors reflect light into lens, then on to a CCD that turns light into electricity. White=more current. Focused light reaches color CCD (diodes). A converter (ADC) stores readings of electricity as shades of gray. Lastly, the digital information is sent to PC where it is translated into a format that graphics programs understand.
Carriage Assembly of Scanner
The CCD
Tiny, Optical Lens
A Poor Job of Scanning
Moire or interference pattern
Source and background informaton: http://en.wikipedia.org/wiki/Moir%C3%A9_pattern
Another Newspaper Scan
A Good Scan – in color
Google Book Scan Problem
Scanners used to:
Scan paper – including documents, pictures, etc. in black and white, gray tones and color
Scan objects – for ART and non-art use Used to send a “FAX”, via email To archive important documents (feeder) Convert image to editable text using OCR
software As a design tool for graphics, drafting, etc.
Scanner Control Panel; Example
Scanned Text (image)
OCR – on line serviceImage to DOC or TXT
http://www.newocr.com
Scanner Button Settings
Image Scan Settings
More about Settings
• 300 dpi is nominal. To print, use 600 dpi. Use 600 for CD/DVDs, museum archives.
• Computer screens are 96dpi, so use 96 dpi if it's for the for the PC.
• Save in TIF for quality. JPGs for photos and art, GIFs for line art, text and font images.
• Use B&W for plain text, Grayscale for newspapers*, photos, pencil and text for print
• Dithering – smooths color – example follows.
Grayscale
The scale is 0 to 100. 0 is paper white, while 100 is solid black.
Dithering
Dots or pixels are arranged in such a way that allows us to perceive more colors than are actually used.
More about Scanning Newspapers
Back up the clipping with BLACK paper to prevent “print through”.
Iron the clipping so it's FLAT. Put dish towel on it and iron it.
Some scanners have DESCREEN. Use it.
Some scan in color and convert to grayscale
Scan in as TIF, manipulate image then save as .jpg
Resolution – general “rule of thumb”
• For example, let's say you were scanning a 6" x 4" photo and printing to a 600 dpi color printer.
• If you wanted the printout to be the same size as the original, you could scan at 150dpi (= 1/4 the resolution of the printer).
Scanning Slides
• Template for back lighting (For slides.). Reflects light BACK through the slide.
• Battery operated light – fluorescent (color, no EMF interference since ( NOT 60 cps) battery is used)
Original scanned at 300 dpi
Original scanned at 96 dpi
Deep Field Scanning
You may scan under plastic (translucent plastic box) or under a black box. (Paint inside of a shallow box flat black.
Scanning Objects
Scan Feathers
Fruit and vegetables
Shells
Flowers
Pine Cones
Scan Backgrounds and Large Images
Use of tissue paper, rice paper, velvet or any texture or background that would add interest.
Keep scan glass clean and protected
Scan large images and STICH together with software. Search GOOGLE for “panoramic” for samples, guides, etc.
Scanning objects
Manipulation of Source
Art Scan; Assemblage
Tips and Tricks
Experiment. Make collages and scan them, Make assemblages and scan them (3D)
Make your own FONTS for writing http://www.yourfonts.com
Scan your signature http://www.productivity501.com/how-to-create-a-scanned-signature/357/
3D Object
Jump to Designing a Porch
• I used my scanner in 2002 to design a front porch for my house.
• A portion of the slide presentation is shown here with explanation.
Scanned B&W Negative
Scanned negative on LEFT. Used image software to change scan to NEGATIVE, which makes a “PRINT”. This can be manipulated, of course.
Scan Negatives
References
http://www.scantips.com/
http://heritagecollector.com/support/Registered/GSuggestions/Class2Scanning.htm
http://danandsherree.com/2005/10/07/basic_scanning_techniques.php
http://www.web-wise-wizard.com/web-graphics-design/ (Image formats)
http://www.newocr.com/ Image to TEXT
What's Next?
As always, practice, experiment Practice some more. Then some more.
Credits
• Thanks to Richard at Nicola Engineering for color information.
• Thanks to Thomas at TutorVista for math conversions.
• Thanks to Jessica for recycled scanner parts.
• Thanks to WikiPedia for diagram.
Presentation, © 2009, T. Pitre, Sequim.