Digital Photography. ISO Light Sensitivity.

DigitalPhotography

ISO

Light SensitivityLight Sensitivity

What ISO denotes is how What ISO denotes is how sensitive the image sensor is to sensitive the image sensor is to the amount of light present. The the amount of light present. The higher the ISO, the more higher the ISO, the more sensitive the image sensor and sensitive the image sensor and therefore the possibility to take therefore the possibility to take pictures in low-light situations.pictures in low-light situations.

http://www.photoxels.com/tutorial_iso.html

However, all this increase in However, all this increase in sensitivity does not come free. sensitivity does not come free. There is a price to pay with your There is a price to pay with your image appearing more noisy.image appearing more noisy.

An image sensor is usually calibrated An image sensor is usually calibrated so that it gives the best image quality so that it gives the best image quality (greatest S/N ratio) at its (greatest S/N ratio) at its lowestlowest possible ISO speed. For most possible ISO speed. For most consumer digital cameras, this value consumer digital cameras, this value will be expressed as ISO 50, ISO 64 will be expressed as ISO 50, ISO 64 or ISO 100. A few digital cameras use or ISO 100. A few digital cameras use ISO 200 as their lowest ISO speed.ISO 200 as their lowest ISO speed.

Optimum Camera

Settings

Quality

Compression

Lossy Compression (Destructive)

Control Freak?

RAW

What size should you make your

images?

It Depends!

WebSmall size: 640 x 480Small size: 640 x 480

DPI: 72 – 96DPI: 72 – 96

Colorspace: sRGBColorspace: sRGB

Photos: JPEGPhotos: JPEG

PowerpointSize: 1024 x 768Size: 1024 x 768

DPI: 144DPI: 144

Colorspace: sRGBColorspace: sRGB

Photos: JPEGPhotos: JPEG

NewspaperLargest sizeLargest size

Colorspace: Adobe1998Colorspace: Adobe1998

Include caption Include caption informationinformation

Organization

Store all images in one main folder on you computer

2008_photo_archives_sp2008_photo_archives_sp

Name folders with date

20080123central_ext_job20080123central_ext_job

20080131east_ext_job20080131east_ext_job

20080204west_ext_job20080204west_ext_job

Name all files the same way

20080123central_ext00120080123central_ext001

20080123central_ext00220080123central_ext002

20080123central_ext00320080123central_ext003

2008_photo_archives_sp2008_photo_archives_sp20080123central_ext_job20080123central_ext_job

20080123central_ext00120080123central_ext00120080123central_ext00220080123central_ext00220080123central_ext00320080123central_ext003

Archives

Always have a backup

External harddriveExternal harddrive Network with automatic Network with automatic

backupbackup CDs and DVDs are NOT CDs and DVDs are NOT

reliablereliable

Photography

Good Composition

A pleasing arrangement of A pleasing arrangement of objects, mass, lines and objects, mass, lines and

contrasts of colors to form a contrasts of colors to form a harmonious wholeharmonious whole

3 Essentials of a good photograph

Good Technical QualityGood Technical Quality Interest or ImpactInterest or Impact Good CompositionGood Composition

Good Technical Quality No camera movementNo camera movement

Correct body positionCorrect body position Correct focusCorrect focus

Person’s eyesPerson’s eyesSelective/depth of fieldSelective/depth of field

LightingLightingFront, back, sideFront, back, side

ExposureExposure

Interest or Impact Tell a storyTell a story Express a moodExpress a mood Make a patternMake a pattern

S C U F I

Shoot

Close

Up

For

Impact

Good Composition Get closerGet closer Rule of ThirdsRule of Thirds Vantage pointVantage point Framing movementFraming movement

Keys to Success Keep it simpleKeep it simple Try vertical & horizontalTry vertical & horizontal Place subject off-centerPlace subject off-center Try unusual points of viewTry unusual points of view

Ten Tips for Better Pictures

1.1. Get close to the subjectGet close to the subject2.2. Keep people busyKeep people busy3.3. Place the subject off-centerPlace the subject off-center4.4. Use a simple backgroundUse a simple background5.5. Find unusual viewpointsFind unusual viewpoints6.6. Look for dramatic lightingLook for dramatic lighting7.7. Include the foreground to add depth Include the foreground to add depth

to scenic photosto scenic photos8.8. Keep your camera readyKeep your camera ready9.9. Take extra pictures of good Take extra pictures of good

subjectssubjects10.10. Read your manualRead your manual

1. Get close to the subject

2. Keep people busy

3. Place the subject off-center

4. Use a simple background

5. Find unusual viewpoints

6. Look for dramatic lighting

7. Include the foreground to add depth to scenic photos

8. Keep your camera ready

9. Take extra pictures of good subjects

10. Read your manual

http://www.ca.uky.edu/agc/econf08