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LED Digital Display
 

 

 

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Source page: http://commons.wikimedia.org/wiki/File:LED_Digital_Display.jpg

Summary

Description
English: Showing both sides of w:LED digital display
Date 4 June 2009(2009-06-04)
Source Own work
Author Mlogic
Ufraw.png
This raster graphics image was created with UFRaw.

Licensing

I, the copyright holder of this work, hereby publish it under the following licenses:
w:en:Creative Commons
attribution share alike
This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license.
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  • to remix – to adapt the work
Under the following conditions:
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  • share alike – If you alter, transform, or build upon this work, you may distribute the resulting work only under the same or similar license to this one.

GNU head Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.

You may select the license of your choice.
U.S. quarter

This image has currency in it to indicate scale.

Avoid using objects such as coins for scale, as they will require people unfamiliar with them to look up the dimensions or guess, both of which defeat the purpose of the object in the first place. Coins are particularly bad as they can reinforce a geographical bias, and some coins' designs are copyrighted.

Ideally, a photograph should include a ruler with the subject (as seen in this photo) or add a scale marking via an image editor instead (as seen in this photo). SI ("metric") units are the most commonly used worldwide (see metre, 1 E-2 m).

Examples of bad practice: here.

A tape measure


Common coin diameters for reference:

  • U.S. dollar:
    • 1¢: 19.05 mm , 0.75 in
    • 5¢: 21.21 mm , 0.79 in
    • 10¢: 17.91 mm , 0.71 in
    • 25¢: 24.26 mm , 0.94 in
    • 50¢: 30.61 mm , 1.22 in
    • $1: 26.5 mm , 1.02 in
  • Canadian dollar:
    • 1¢: 19.05 mm , 0.75 in
    • 5¢: 21.2 mm , 0.83 in
    • 10¢: 18.03 mm , 0.71 in
    • 25¢: 23.88 mm , 0.94 in
    • 50¢: 27.13 mm , 1.07 in
    • $1: 26.5 mm , 1.02 in
    • $2: 28 mm , 1.1 in
  • Pound sterling
    • 1p: 20.32 mm , 0.8 in
    • 2p: 25.91 mm , 1.02 in
    • 5p: 18 mm , 0.71 in
    • 10p: 24.5 mm , 0.96 in
    • 20p: 21.4 mm , 0.84 in
    • 50p: 27.3 mm , 1.07 in
    • £1: 22.5 mm , 0.89 in
    • £2: 28.4 mm , 1.12 in
  • Euro
    • 1c: 16.25 mm , 0.64 in
    • 2c: 18.75 mm , 0.74 in
    • 5c: 21.25 mm , 0.84 in
    • 10c: 19.75 mm , 0.78 in
    • 20c: 22.25 mm , 0.88 in
    • 50c: 24.25 mm , 0.95 in
    • €1: 23.25 mm , 0.92 in
    • €2: 25.75 mm , 1.01 in

Other Information

This is a Kingbright LED Display model CA56-21GWA. A datasheet may be found here: http://www.rapidonline.com/netalogue/specs/55-1676.pdf



Licensing:
Creative Commons Attribution-Share Alike 3.0 Unported

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EXIF data:
File name led_digital_display.jpg
Size, bytes 1419866
Mime type image/jpeg
Image input equipment manufacturer Canon
Image input equipment model Canon EOS 5D Mark II
Orientation of image 1
Image resolution in width direction 72/1
Image resolution in height direction 72/1
Unit of X and Y resolution 2
Exposure time 8/1
F number 11/1
Exposure program 3
ISO speed rating 50
Exif version 0221
Lens focal length 50/1
Date and time original image was generated 2009:06:04 18:35:54
Date and time image was made digital data 2009:06:04 18:35:54
Meaning of each component 
Shutter speed -3/1
Aperture 14000/2001
Exposure bias 0/1
Metering mode 5
User comments ASCII
Supported Flashpix version 0100
Color space information 1
Exif image width 5616
Exif image length 3744
InteroperabilityOffset 1020
Focal plane X resolution 327183/85
Focal plane Y resolution 633119/162
Focal plane resolution unit 2
White balance 1
Sharpness 2
Interoperability index R98
Interoperability version 0100
Software used ImageMagick 7:6.5.1.0-1.1 amd64 from Debian, UFRaw 0.15-2+b1 amd64 from Debian Lenny
Copyright holder Yan Li , mlogic.org/~yan, Creative Commons Attribution-Share Alike 3.0
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