Resolution:
Size really does matter…
The word PIXEL (pick sell) comes from two words: Picture = PIX and Elemnet = EL. A pixel is the smallest part of a digital image. At its most basic leve a single coloured square.
How do we create a pixel?
- Scanner
- Digital Camera
- Create an image on screen using specialist software, e.g. Adobe Photoshop
Digital images are always rectandles or are squares. They are constucted of pixels. There is horozontal nu,ber and a vertical nu,ber pf pixels. when you multiply these two numbers, you get the pixel size of the image.
- A million pixels is called a Megapixel
For example, an image that is 2084 pixels wide and 1536 pixels high = 3,145,728, called a 3-megapixel image, a very common image size used with digital cameras.
So what resolution do i need?
There are millions theories on what the opitum resolution is. Here are my top tips:
1.Before you do anything, KNOW YOUR OUTPUT!
Inother words are you going to use the image for:-
A) Screen
B)Print
2. KNOW YOUR DIMENSIONS.
If you are creating an image to display on screen, what size will it be? Will it be full screen, half screen, etc.
If your going to print the image, is going to be A4, A3, a 6″ x f” photograph etc.
Catution, ther bigger the dimensions, the bigger the file zone (meomory)
So what size do i need?
The 3 resolution figures youll ever need to remember are:
Traditionally:
72ppi for anything on a screen.
3000ppi for anything printed.
Realistically:
You simply need yo know the physical PPI: The PPI that a physical screen actualy provides.
72PPI
Traditionally this resolutuion was used for anything that was to be displayed on a monitor or screen.
For example: On a website, a poerpoint presentation, Tv screen, anything that doesnt require a quality printout.
The chice of 72PPI by Macintosh for their displays arose from the convient fact that actually appeared on their display screens.
The PPI of a computer display is related to the size of the display in inches and the total number of pixels in the horizontal and vertical directions. This measurament is often reffered to as dots per inch, though that measuarment more accurately refers to the resolution of a computer printer.
PPI is affected by the Dot Pitch of the screen:
the dot pitch of a computer display dtermines the absolute limit of possible pixel density. Typical circa-2000 cathode ray tube or LCD computer displaysrange from 67-130 PPI.
The IBM T220/T221 LCD monitors marketed from 2001-2005 reached 204 PPI.
Resolution of Mobile Devices: These are the top 4 and there all different,
Apple iPhone 4: 326ppi
LG KM900 Arena: 311 ppi
Samsung S8000 Jet: 301 ppi
Canon EOS 550D (T2i): 289 ppi
ahransingh 