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Digital Images and Digital Cameras Digital Images and Digital Cameras

Digital Images and Digital Cameras - PowerPoint Presentation

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Uploaded On 2017-09-17

Digital Images and Digital Cameras - PPT Presentation

take notes in your journal Monitors Small LCD displays built into most cameras Menus are displayed on monitor Compose your image on a monitor Review images on the monitor Drains battery when monitor is on ID: 588725

digital image cameras pixels image digital pixels cameras size file color monitor images camera number buffers sensor viewfinders formats absolute capture raw

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Slide1

Digital Images and Digital Cameras

take notes in your journalSlide2

Monitors

Small LCD displays built into most cameras

Menus are displayed on monitor

Compose your

image on a monitor

Review images on the monitor

Drains battery when monitor is on

Glare can be a problem

Good for close ups and odd anglesSlide3

Viewfinders

Great for fast action (capturing the moment)

Do not drain the battery

Optical viewfinders On SLR cameras see exactly what the lens sees

Viewfinders on point and shoot cameras show the scene through a separate window that is slightly offset. (You may end up with an image slightly different than you expect.)Slide4

Capturing images

Hold the right side of the camera with your right hand while supporting the lens or camera body with your left

Decisive moment – can be hard to capture with digital cameras.

First and second delay affect how quickly a series of photos can be taken.(frame rate)

If it takes too long for the image to clear you miss the shot.Slide5

Buffers

Buffers speed up the time an image takes to move from the image sensor to the card.

Buffers are fast memory that allow you to take many photos quickly.

Continuous mode is a feature on some cameras. With this mode you can hold the shutter button down and continuously take pictures.Slide6

What is a digital photograph

Digital photographs are made up of millions of tiny red, green and blue forming pixels.

Dots make up all types of images

Newspaper (halftone)

Monitor (pixels)

Inkjet printer (bitmap)Slide7

The Image Sensor

The“film

” of the digital camera

A silicon chip with a grid of millions of photosensitive diodes that capture light.Slide8

Digital Color

Image sensor can only capture brightness, not color

The light is recorded in a gradual scale from absolute black to absolute white. (Gray Scale)

Color is created in much the same way as the first color photography.Slide9

Digital color is created by applying filters through a process called interpolation.

The color you see on your monitor depends on the settings and capabilities of your computer.

Some image file formats cannot see all of the colors. RAW and tiff are file formats that can see all of the colors. Slide10

Selecting an image size

Relative size is determined by the device used to display it.

Absolute size is determined by the number of pixels used to create it.

Size is specified in one of two ways

Pixel dimensions (3072x2048)

Total number of pixels it contains (6.29 million pixels)

Pixelization occurs when an image with a lower pixel number is made too big.Slide11

Edit a photo in its largest file size and then reduce the size if needed.

Cameras capable of large image sizes are more expensive.

Think about what you are going to do with your images before you decide on a camera

On the web – lower resolution (number of pixels)

Inkjet or laser print-200-300 pixels per inch

Professional printing – at least 900 pixels wide.Slide12

Selecting an Image Quality

What is file compression?

Name some image file formats

Why is raw different from other file formats?

Why is jpeg referred to as “

lossy

” compression?