megapixels. intro when you are going to purchase a camera, two very important questions should be...
TRANSCRIPT
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Megapixels
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Intro
• When you are going to purchase a camera, two very important questions should be asked:
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First Question• First will it be a point and shoot or an SLR?
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What the heck are megapixels?• Second how many megapixels is this
camera?
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Objectives• Learn what Megapixels are.
• How Megapixels relate to maximum print sizes.
• What DPI and PPI are.
• How to figure out the maximum print size based on the pictures resolution.
• What is resolution and how is it calculated.
• How to calculate an area.
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Why is this useful?• A Camera is a tool; use the right tool for the
job.
• Making an educated decision about what camera to purchase.
• If you have a picture you will know exactly how large you can print it without losing quality.
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What is a Megapixel?• A Megapixel is 1 million pixels• Pictures are made up of little dots
called pixels.• Pixel stands for PICture Element• They are arranged horizontally and
vertically
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How are megapixels calculated?
• Multiply the number of horizontal pixels by the number of vertical pixels. It is exactly like calculating area.
• A 3MP ( megapixel) camera has 2,048 horizontal pixels and 1,536 vertical pixels, for a total of 3,145,728 pixels. We would simply call this a 3 MP camera.
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Find an unknown dimension• Example 35=7Y
• 7 X 5 is 35 so we divide 35 by 7 which equals 5.
• 24=8Y
• 32=Y – 4
• 12=Y + 9
• Bonus 3Y + 8=20
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Answers to examples
• 24=8Y Y=6
• 32=Y – 4 Y=36
• 12=Y + 9 Y=4
• Bonus 3Y + 8=20 Y=4
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Find the Megapixels• Find the Megapixels for the following pictures:• 4300X2600• 3228X2300• 2300X1800
A Picture is 12 MP, it’s length is 5300 what is it’s width?
• Remember to round the number to the nearest million.
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Answers
• 4300 X 2600= 11,180,000 or 11MP
• 3228 X 2300= 7,424,400 or 7MP
• 2300 X 1800= 4,140,000 or 4MP
• 5300 X 2,264 for 12MP
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Bonus• You can use this same idea to find the total
square footage of an area.53’
26’
Find the total square footage
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Bonus• Answer
53’
26’ 1378’
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Part 2
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Resolution• Resolution is basically your total
pixel count• If the pixel count ( or resolution) is
small, the image quality is poor.•
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What is the difference between dots per inch and pixels per inch????
• PPI refers to the square pixels in a digital image, with NO spaces between them.
• DPI refers to printed dots AND the spaces between them.
PPI DPI
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Printing• When printing on paper, resolution is
also how many pixels you have per inch.
• This is the image resolution and has nothing to do with the technology by which the print is made. (Inkjet, Laser)
• Adding or taking away pixels is called resampling, and can cause loss of quality
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Printing• 150 DPI ( 300 PPI) is the accepted
standard for printing photographic quality images.
• Printers usually refer to the number of rows or lines per inch (LPI)
• 150 LPI is simply 150 rows of 150 Dots Per Inch
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• When a digital image is prepared to print, pixels are converted to dots.
• Dots have spaces between them. 300 pixels becomes 150 dots AND spaces, so 300 PPI becomes roughly 150 DPI.
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More Pixels = Better Quality
• 72-ppi and 300-ppi images; inset zoom 200%
• PPI is used to describe how densely the pixels that make up an image are packed within a span of an inch.
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Are all cameras equal?• Even if two cameras have the same
number of pixels, it does not always mean that the size of their pixels are also equal.
• If an SLR camera has a greater “digital Sensor area” than a compact camera, then each pixel from the SLR will be larger in size than each pixel from the compact camera
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So Why do we care how big the pixels are in size?
• A larger pixel has more light-gathering area, causing the individual pixels to be further apart, making it easier to control image noise and tonal distribution.
• The image will be smoother and more detailed
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How do you know how large you can print your photo for maximum
quality?• You take photos of your sister’s wedding. You
have an 8 megapixel camera. This is 8,000,000 pixels
• Your resolution is 3264 x 2488• If you have 300 PPI, you will divide 3264 by 300
and 2488 by 300 • You get 10.88 x 8.29. So the biggest photo you
would want to print for maximum quality is 10 x 8
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Here is a chart to help you
(numbers inside colored boxes are megapixels)
Inches @ 300 DPI ( numbers inside colored boxes are megapixels)
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Megapixels Pixel Resolution*Print Size @ 300ppi
Print size @ 200ppi
Print size @ 150ppi**
3 2048 x 1536 6.82" x 5.12" 10.24" x 7.68" 13.65" x 10.24"
4 2464 x 1632 8.21" x 5.44" 12.32" x 8.16" 16.42" x 10.88"
6 3008 x 2000 10.02" x 6.67" 15.04" x 10.00" 20.05" x 13.34"
8 3264 x 2448 10.88" x 8.16" 16.32" x 12.24" 21.76" x 16.32"
10 3872 x 2592 12.91" x 8.64" 19.36" x 12.96" 25.81" x 17.28"
12 4290 x 2800 14.30" x 9.34" 21.45" x 14.00" 28.60" x 18.67"
16 4920 x 3264 16.40" x 10.88" 24.60" x 16.32" 32.80" x 21.76"
Megapixels vs. Maximum Print Size Chart