Resolution, Frame & Sample Rates 9ISTW1L3

Meet the smallest guy The arrow points to the smallest amount of graphical data we use. Its called a PIXEL

The arrow points to the smallest amount of graphical data we use.

Its called a PIXEL

How many PIXELS If my screen is set to display 800x600 mode. I am using 480,000 of them. For ‘true’ colour, each pixel could be 1 of 16.7 million choices. There are 24 ‘bits’ of memory available for each pixel to use , so the biggest number it could be in BINARY is 1111 1111 1111 1111 1111 = 16.7million(ish) 600 800

If my screen is set to display 800x600 mode.

I am using 480,000 of them.

For ‘true’ colour, each pixel could be 1 of 16.7 million choices.

There are 24 ‘bits’ of memory available for each pixel to use , so the biggest number it could be in BINARY is

1111 1111 1111 1111 1111 = 16.7million(ish)

PIXEL BLOW OUT So if you want to use a big screen setting or want to print something large, then you need more and more pixels. Early video games didn’t have high resolution or many colours. Bigger size & more colours = bigger memory demands and more processor time. Until the late 90s, most computers could choose from about 256 colours (8 bit) not 16.7 million (24 bit).

So if you want to use a big screen setting or want to print something large, then you need more and more pixels.

Early video games didn’t have high resolution or many colours.

Bigger size & more colours = bigger memory demands and more processor time.

Until the late 90s, most computers could choose from about 256 colours (8 bit) not 16.7 million (24 bit).

Resolution? In Digital Media talk about RESOLUTION of images and video. RESOLUTION refers to the amount of detail that is either input or output using a computer The bigger the resolution number, the finer the detail Each DOT on your screen is called PIXEL Your screen uses 72 PIXELS in each INCH There are 72 little ‘dots’ in each inch of your screen.

In Digital Media talk about RESOLUTION of images and video.

RESOLUTION refers to the amount of detail that is either input or output using a computer

The bigger the resolution number, the finer the detail

Each DOT on your screen is called PIXEL

Your screen uses 72 PIXELS in each INCH

There are 72 little ‘dots’ in each inch of your screen.

Resolution? A printer does not have PIXELS Printers use tiny DOTS to output images PRINTERS usually have 300-2400 DOTS in each INCH that they can do. Printers measure in DPI (Dots per inch) So printers need somewhere between 4 and 32 times as much input to make an image look sharp – compaired to a screen

A printer does not have PIXELS

Printers use tiny DOTS to output images

PRINTERS usually have 300-2400 DOTS in each INCH that they can do.

Printers measure in DPI (Dots per inch)

So printers need somewhere between 4 and 32 times as much input to make an image look sharp – compaired to a screen

PPI and DPI Let’s get it straight. DPI is what your printer spews out – dots on paper. PPI is what digital cameras and scanned images produce. True, the world won’t end if we interchange these terms, but we need to understand that PPI is input ; DPI is printer output.

Let’s get it straight.

DPI is what your printer spews out – dots on paper.

PPI is what digital cameras and scanned images produce.

True, the world won’t end if we interchange these terms, but we need to understand that PPI is input ; DPI is printer output.

72ppi If a 72ppi image is 20mm x 10mm at it’s original size… And you then print it out on A 300dpi printer and also enlarge it to 200mm x 100mm

You simple did not have enough pixels in your input and when you make it bigger, it looks like this. This is what we call LOW RESOLUTION.

Moving Digital Images

Digital Motion Digital Media can be used for moving images – FILM, though it’s not film, its just BINARY now. Frame rate , or frame frequency , is the measurement of how quickly an imaging device produces unique consecutive images called frames . The term applies equally well to computer graphics , video cameras , film cameras, and motion capture systems. Frame rate is most often expressed in frames per second or simply, hertz (Hz).

Digital Media can be used for moving images – FILM, though it’s not film, its just BINARY now.

Frame rate , or frame frequency , is the measurement of how quickly an imaging device produces unique consecutive images called frames .

The term applies equally well to computer graphics , video cameras , film cameras, and motion capture systems. Frame rate is most often expressed in frames per second or simply, hertz (Hz).

Digital Media - Sound

Sound Capture When we turn ANALOGUE sound into digital, we refer to it as CAPTURING. When we talk about the ‘quality’ of the sound, we talk about its SAMPLE RATE. The higher the sample rate, the better the reproduction will be The higher the sample rate, the bigger the file size will be too!

When we turn ANALOGUE sound into digital, we refer to it as CAPTURING.

When we talk about the ‘quality’ of the sound, we talk about its SAMPLE RATE.

The higher the sample rate, the better the reproduction will be

The higher the sample rate, the bigger the file size will be too!

Sampled Music The sampling rate , sample rate , or sampling frequency defines the number of samples per second taken from ANALOGUE input It can be measured in hertz (Hz). There are some common RATES that we use in DIGITAL MEDIA

The sampling rate , sample rate , or sampling frequency defines the number of samples per second taken from ANALOGUE input

It can be measured in hertz (Hz).

There are some common RATES that we use in DIGITAL MEDIA

Rates of sampling 8,000 Hz - telephone , adequate for human speech 11,025 Hz and 22,050 Hz - used WEB sounds like YOUTUBE. 32,000 Hz - miniDV digital video camcorder 44,100 Hz - audio CD , also most commonly used with MPEG-1 audio ( VCD , SVCD , MP3 ) 96,000 or 192,000 Hz - DVD-Audio , some LPCM DVD tracks, BD-ROM (Blu-ray Disc) audio tracks, and HD-DVD (High-Definition DVD) audio tracks

8,000 Hz - telephone , adequate for human speech

11,025 Hz and 22,050 Hz - used WEB sounds like YOUTUBE.

32,000 Hz - miniDV digital video camcorder

44,100 Hz - audio CD , also most commonly used with MPEG-1 audio ( VCD , SVCD , MP3 )

96,000 or 192,000 Hz - DVD-Audio , some LPCM DVD tracks, BD-ROM (Blu-ray Disc) audio tracks, and HD-DVD (High-Definition DVD) audio tracks

Summary Digital Media includes Sound, Moving Images (film), Static Images(photos & paintings), Animated Images Storage Media, CDs, DVD, Hard Drives Devices – scanners, microphones

Digital Media includes

Sound, Moving Images (film), Static Images(photos & paintings), Animated Images

Storage Media, CDs, DVD, Hard Drives

Devices – scanners, microphones