Digital Photography
This presentation is the property of its rightful owner.
Sponsored Links
1 / 43

B.Sc. (Hons) Multimedia Computing PowerPoint PPT Presentation


  • 54 Views
  • Uploaded on
  • Presentation posted in: General

Digital Photography. B.Sc. (Hons) Multimedia Computing. Media Technologies. Agenda. Digital Principles Camera Types Lens Principles Common Features Legacy Issues. B.Sc. (Hons) Multimedia Computing. Media Technologies. Digital Camera Principles. Digital Principles.

Download Presentation

B.Sc. (Hons) Multimedia Computing

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Digital Photography

B.Sc. (Hons) Multimedia Computing

Media Technologies


Agenda

  • Digital Principles

  • Camera Types

  • Lens Principles

  • Common Features

  • Legacy Issues

B.Sc. (Hons) Multimedia Computing

Media Technologies


Digital Camera Principles


Digital Principles

Analogue to Digital Converter

White balanceAnti-aliasingCompression

Storage

Sensor

Light from scene

Analogue Electrical Signal

Digital Signal

Filters

Buffer


Digital Principles

Size of sensor determines resolution of images

3008

2000

3008 x 2000 = 6,016,000 = 6 Megapixels (6MP)

Buffer size also important - buffer size determines many images you can take in quick succession


Types of Digital Camera


Compact rangefinder type cameras -Limited features - aimed at general users ( novice / occasional use)

Prosumers Types - aimed at the advanced amateur / semi pro user - more sophisticated functionality - probably has a wide ranging zoom lens - but not interchangeable - affordable price

DSLRs (Digital SLRs) full system cameras with interchangeable lenses and other professional accessories such as dedicated flash systems etc. Expensive as compared with prosumer models

Types of Digital Camera


Digital Camera Types

Prosumer

Compact

DSLR (Full Frame Sensor)


Mini-DSLR: Sony NEX-5


Lenses for Digital Cameras


Question

Are digital camera lenses the same as film camera lenses?

Answer

Yes - but effect focal length depends on size of digital sensor used in camera

Lenses for Digital Cameras

Lens image circle coverage

Full frame 35mm film gate


Lenses Circle Coverage

Sensor not full frame thus any lens will have telephoto effect as compared with equivalent filmcamera lens


Full Frame Sensor

Sensor full frame thus any lens coverage and focal length the same as for film camera lenses


A ‘Prosumer’ Digicam – Canon Pro-1

LCD screen

Ultrasonic zoom lens

Sensor


Common Principles


Common Photographic Principles

  • Subject Matter ‘The Great Themes’

    • Portraiture

    • Still Life

    • Landscape

    • Social and Documentary

  • Lighting and Exposure

    • Available light (natural light)

    • Flash

    • Studio

  • Composition - ‘Rule of Thirds’

  • Gadgets (Lenses, Tripods, Filters, Bags)


Autofocus (1) – Blurred image


Autofocus (2) – sharp image


Image stabilisation

  • Canon’s newly developed Hybrid IS technology optimally compensates for angular camera shake (rotational) and shift camera shake (linear). Sudden changes in camera angle can cause significant blur in images taken during standard shooting, whereas blur caused by shift-based shaking, when a camera moves parallel to the subject, is more pronounced in macro and other close-up photography.


Intelligent recognition


Flash and Lighting

Three Important features of a flashgun

1. Guide Number - indicates light power available

e.g (30 Meters at 100 ISO) reasonable power for average use

2. Recycling time - how long (in seconds) flash takes to be ready for next

3. Thru-The Lens (TTL) flash metering

Guide number: 165 in feet / 50 in meters 105mm (ISO 100)

Charge time: Approx. 6seconds (when using alkaline batteries) Approx 4seconds (when using NiMH batteries)


Pro Flash Lighting

Guide Number = 60 Metres at ISO 100


Pro Lighting -Studio Flash

Continuous background paper


Product Photography

Copy Stands - provide consistent diffuse lighting for photographing product items


Use the Flash off-camera

Bounce lighting from white surface to diffuse lighting

Flash Photography Tips

Inverse Square Law - doubling the distance requires four times the light


What’s Changed ?


Changes in the Digital Era

  • Traditional Photography

    • Take pictures then develop and print using chemical processes in a ‘Darkroom’ - or send to a film lab

  • Digital Photography

    • Take pictures then upload to a computer and edit in graphics application or dedicated software application usually bundled with camera - can take a long time!

    • What images to print - often get left on the computer

    • Professional software available - Aperture and Lightroom

    • Software ‘Media Centres’ replaces the old technology of a slide projector and slide show

    • Take memory card to digital photo booths etc


The Darkroom


Digital Image Processing in ‘The Light Room’


Image Formats and Software

Formats

  • Uses established image formats such as JPEG and GIF

  • New formats such as RAW - a raw i.e. ‘unprocessed’ image file contains minimally processed data from the image sensor of a digital camera and must be processed to be used as an editable image such as JPEG or GIF. Contents of RAW files are often considered to be of 'higher quality' than the RGB converted results.

  • RAW files different for each manufacturer - Adobe has developed .DNG Digital NeGative as a de-facto standard for RAW data to encourage usage of a common RAW format to prevent future legacy issues.

    Software

  • Adobe recently released version one of Lightroom - an integrated digital image editing and photographic library management system (PC & MAC)

  • Aperture - similar to Lightroom - aimed at professionals - already fairly well established in the professional market

B.Sc. (Hons) Multimedia Computing

Media Technologies


Legacy Issues


Digitizing Legacy Formats

Converting film to digital …

  • Scan-in images and transparencies (slides)

  • Scan negatives into a digital format

Nikon Coolscan9000 ED35mm & 120 film (medium format)

Nikon Coolscan 5000 ED (35mm)


Resolution

  • Some old photos

  • Digital resolutions


Scanned from an old photograph (1)


Scanned from an old photograph (2)


Speed affects noise…


35mm film cameras have a common film

chamber design…

Converting Film Cameras ?


Most 35mm film cameras have interchangeable backs e.g. data backs etc.

Converting Film Cameras


Solution - a digital sensor that fits inside the film chamber

and captures images at the film plane

Converting Film Cameras


Silicon Film...

Digital sensor film insert fits most SLR cameras!


Silicon Film Cartridge

Sensor


The future?


Software References

  • www.adobe.com - Lightroom tryout

  • www.apple.com - Aperture tryout

  • www.google.co.uk – Picasa 2

B.Sc. (Hons) Multimedia Computing

Media Technologies


  • Login