Author: austingarf

All About Digital Photos

Read “What is a digital photo” and answer the following questions

1. The word ‘pixel’ is short for what?

Picture Elements

2. What three base colours are used to make all the colours in a digital image? What is this system called?

Colours: Red, Green, and Blue. This system is called the “24 bit RGB” System.

3. What is the total number of colours this system can produce?

This system can produce 16 million colours which is the approximation of what the human eye can apprehend.

5. Why do we sometimes have to scroll around in our screen to see the whole image?

Computers can only display so many pixels at once. There is a range of pixels a computer can display depending on the computer. Thus, an image is cut off or partly displayed, causing you to scroll down to see the entire image, when the “life size” image has larger pixel dimensions than the display.

6. What is the difference between dpi and ppi?

DPI (dots per inch) does not have anything to do with the digital photo, but it’s the resolution of a printer. Whereas, PPI (pixels per inch) is not the digital photo itself, but it’s the resolution of the printed output of a digital photo.

7. What are the four factors that work together to create photo quality? Of these four, which ones are under your control?

  • Quality of the recording device
  • Size, in pixels, of the digital image
  • Stored in digital format (lossless vs lossy compression)
  • “Eye” of the photographer and technical proficiency (under photographers control)

8. Why do large cameras generally take better photos than smartphones or compact cameras?

Larger cameras or dSLR’ have larger and higher quality sensors in which produce high resolution and/or good quality photos. On the other hand, smartphone or compact cameras do not have the pixel quality to compare to dSLR’, although, from afar and on a small display, the quality is not very contrasting.

Grading

Knowledge and Understanding /16