Evaluating An Image How things look on the screen doesn’t always matter. A full resolution image from a 6 megapixel camera printed on 4” x 6” paper… each.

Slides:



Advertisements
Similar presentations
The f/stop has a dual function complicating its understanding by the beginner. The f/stop is half the exposure changing mechanism along with the shutter.
Advertisements

Book Scanning & Digital Image Production The VRC Guide to Imaging By Kate Stepp.
By Aaron Proia and Matthew Copenhaver.  For this presentation, we will be walking you through two processes that are commonly used in Photoshop.  These.
Camera PartsCamera Parts  3 main parts of a camera  lens  film (or sensors)  body.
Exposure The balance of the amount of light allowed entering the photographic medium There are 3 elements used to create the desired exposure 1. ISO 2.
Which of the two photographs appears to be the sharpest to your eyes? The image on the left has relatively low resolution with high contrast, while the.
In all cameras, light enters through the lens and hits the recording medium. (In film cameras, the film plane, in digital cameras (for our purposes),
Adobe Photoshop CS4 – Illustrated Unit G: Creating Special Effects
Digital Photography Final Exam Study Guide 2015 DIRECTIONS
Photography Basics. The Process The Exposure - Camera and Lens Developing - Dark Room or PS… Printing – Darkroom or InkJet.
Capturing and controlling digital images. Great images are not made by digital cameras. They are made by photographers who understand what to look for.
Chapter 17 Optics 17.1 Reflection and Refraction
Taking Photos Composing a picture Working with light Custom Settings Auto Settings.
Shutter Speed Afzaal Yousaf Baig
Aperture and Depth of Field. Review What are the three controls on the camera that control proper exposure?
Aperture and Depth of Field. APERTURE (F/STOP) 1.What is it? 2.Where is it? 3.What does it do? 4.When do you use it? 5.Why would you use F/2.8? 6.Why.
Digital Cameras An Introduction to Digital Cameras and the Basic Parts of a Canon A85.
Digital Photography White Balance RAW vs. JPEG Resolution & Megapixels Camera Settings.
Digital Photography Fundamentals Rule One - all digital cameras capture information at 72 dots per inch (DPI) regardless of their total pixel count and.
How the Camera Works ( both film and digital )
Camera Functions Using Your Digital Camera. 1. What happens when you press the shutter button down halfway? What does macro mode allow you to do? Pressing.
Joel Willis. Photography = Capturing Light Best Light Sources and Directions Basics: Aperture, Shutter Speed, ISO, Focal Length, White Balance Intro to.
In Three Parts. » Know ˃What exposure is ˃What affects exposure » Show ˃Define Exposure ˃Identify an over, under, and perfectly exposed photo ˃Use exposure.
DIGITAL ZOOM. STEP ONE: Turn off the digital zoom feature. STEP TWO: Don’t ever turn it on again. Works by, cropping the image and then scaling that cropped.
Chapters 4, 5 Buying a Digital Camera Essential Accessories.
Point and Shoot Digital SLR-Single Lens Reflex (DSLR) Prosumer- Not technically its own specification-combines user friendly P&S features with.
Camera types. Megapixel  Equal to one million pixels (or 1 MP).  Higher the MP = higher resolution = nicer looking picture.
FRITZ SCHNEIDERPEACHAM CYBERNETICS Introduction To Digital Photography I - Basics.
Unit 3 Focus, Depth of Field and Lenses Tim Clouse.
Lenses. 3 camera obscura / pinhole camera 3 Focal length is the distance between the lens and the point where the light rays converge. It controls.
Dynamic Range And Granularity. Dynamic range is important. It is defined as the difference between light and dark areas of an image. All digital images.
FYS 100 Creative Discovery in Digital Art Forms Fall 2008 Burg Digital Photography Assignment.
Digital Cameras. Image Capture  Images are captured by the image sensor, then stored in the camera in a memory device.  Sensors convert light into an.
Digital Photography Final Exam Study Guide 2015 DIRECTIONS Answer the following questions using the class website. Almost all questions can be found using.
Controlling the Photographic Process. With today’s modern digital cameras you can have as much or as little control over the picture taking process as.
Intro to Scanners. A scanner works by creating a digital image. When you scan a document, you are making a picture of it. This digital image can be used.
Digital Photography Basics Light Metering White Balance RAW vs. JPEG Resolution & Megapixels Camera Settings.
Lesson 25 Lenses Eleanor Roosevelt High School Chin-Sung Lin.
In the Know … Technological Vocabulary. Movin’ on Up Terms 1. Available Light – Light in a room (sunlight or existing room light) 2. Bit Depth – the color.
Camera Basics. Three things effect the exposure: 2. The size of the aperture or hole that allows light in. 3. The length of time light is admitted into.
Digital Photography Final Exam Review Assignment DIRECTIONS Save this to your Desktop or your Z:drive folder. Then, answer the following questions using.
Resolution: The Peanut Butter Analogy. When you scan an image or take a digital picture you are “collecting” a batch of pixels. The mega pixel rating.
1. What is depth of field? 2. Everything else equal, what effect will each of the following have on depth of field (larger, smaller?): -Larger aperture.
The Physics of Photography
DIGITAL CAMERAS Prof Oakes. Overview Camera history Digital Cameras/Digital Images Image Capture Image Display Frame Rate Progressive and Interlaced scans.
FYS 100 Creative Discovery in Digital Art Forms Spring 2007 Burg Digital Photography Assignment.
Audio and Video Productions Room 706. ISO Determines sensitivity of image sensor to light.
The Future of Photography. What is traditional photography? Lens Light tight box Light sensitive material Eos 1v Camera (no lens) ($1500) Canon EF mm.
It’s all about the pixels! DIGITAL PHOTO. In the late 1990’s digital cameras produced low-quality images that looked okay on a computer screen. But digital.
Lenses Contain both convex and concave lenses. Lenses Many concave and convex lenses, called elements are grouped together to produce a specific magnification.
Glossary of Photographic Terms and Concepts. Aperture (aka f-stop): the opening in a lens. The bigger the opening, the more light will be allowed in through.
The Camera. Photography is all about how light interacts with film and with paper. Cameras are designed to control the amount of light that reaches film.
Lenses Lenses define 2 important things: Angle of view (focal length) Aperture.
Chapter 2: The Lens. Focal Length is the distance between the center of a lens and the film plane when focused at infinity.
Lenses Lenses define 2 important things: Angle of view (focal length) Aperture.
Introduction to Camera. Aperture The larger the aperture of the lens opening the more light reaches the sensor. Aperture is expressed as an f-stop. Each.
Lenses. 3 camera obscura / pinhole camera 3 Focal length is the distance between the lens and the point where the light rays converge. It controls.
Digital Image -M.V.Ramachandranwww.youtube.com/postmanchandru
Getting to know your camera.
Exposure Control Exposure = Intensity of Light (X) Amount of Time
Telescopes.
DSLR vs. point and shoot.
Picture Basics Disclaimer: I am NOT a camera guy
Introduction to Digital Photography
Chapter IV, Introduction to Digital Imaging: Lesson III Understanding the Components of Image Quality
17.3 Optical Systems 1.
Multiple Exposure and Extending the Frame
Sharpening..
Introduction to Digital Photography
Chapter V, Printing Digital Images: Lesson III Using Software to Adjust the Image
Presentation transcript:

Evaluating An Image How things look on the screen doesn’t always matter. A full resolution image from a 6 megapixel camera printed on 4” x 6” paper… each pixel is 1/512 of an inch.

Evaluating An Image If your prints are going to be printed, evaluate that image to how it looks on the printer you use. If for viewing on the screen at full resolution, then pixels matter.

Evaluating An Image Using a printer will show how artifacts will print as well as how colors will translate into print.

Top 8 Imaging Problems Although there are problems inherent in digital imaging, digital cameras still give better quality images than many point-and-shoot film cameras without any corrections to the image

Top 8 Imaging Problems Noise: Like grain in film… Not necessarily a bad thing; can create interesting results.

Top 8 Imaging Problems Noise: Different cameras produce different amounts of noise, some “prettier” than others.

Top 8 Imaging Problems Noise: Typically occurs in darker parts or areas of sky in an image, but can occur anywhere.

Top 8 Imaging Problems Color: Different types of color problems can occur in any image.

Top 8 Imaging Problems Color: Some cameras consistently shoot warmer, others, cooler. Some shoot more or less saturated. None are wrong, maybe just not to your taste.

Top 8 Imaging Problems Color: Some cameras produce a color cast; could be a shift of color in the shadows, but the midtones and highlights are fine. Color casts aren’t hard to fix.

Top 8 Imaging Problems Bad White Balance: Similar to images with color casts, but affect more of an image. If improperly white balanced, a camera will not be able to accurately produce colors.

Top 8 Imaging Problems Chromatic Aberration: Happens with all types of cameras Known as “purple fringing” in digital cameras Often appears in high-contrast areas

Top 8 Imaging Problems Chromatic Aberration: Can happen when a lens focuses some wavelengths of light more or less than others More prevalent in wide angle lenses

Top 8 Imaging Problems Chromatic Aberration: Can also happen when a camera sensor “fills up” with too many electrons which overflow into adjacent photosites

Top 8 Imaging Problems Detail and Sharpness: The result of several factors… Camera resolution Lens quality The sharpening algorithm your camera uses

Top 8 Imaging Problems Detail and Sharpness: Too much detail and sharpness can be a bad thing… An image can look too harsh

Top 8 Imaging Problems Detail and Sharpness: Too much sharpening can cause aliasing, or “jaggies” in your image. Anti-aliasing can be applied to images

Top 8 Imaging Problems Exposure Problems: Camera meters can make mistakes Be aware of how a camera’s metering and exposure choice can affect detail and overall results. (practice)

Top 8 Imaging Problems Lens Distortion: Pincushion distortion causes straight lines to bend inward Usually happens at the longer focal lengths

Top 8 Imaging Problems Lens Distortion: Barrel distortion causes straight lines to bend outward More common, happens at the shorter, wide angle focal lengths

Are Problems Always A Problem? An image can have many technical mistakes but still look good. Examine the whole picture. Does it “work” or not?