Pixels - Computer

What color do you get if R=255, G=255, and B=255?

white

What happens if you increase the range?

If you increase the range, the number of colors that can be represented increase.

Why were images first broken down into pixels? What problem did this solve?

Images had to be broken down into pixels so that a computer could represent them digitally.

What problem does pixelation solve?

It breaks down the picture into data, making it possible to store on a digital device.

Is it possible to represent all of the colors in the world? Why or why not?

It isn't possible to represent all of the colors in the world, because the color spectrum is continuous and computers work with discrete values.

What is RGB?

The RGB color model uses varying intensities of (R)ed, (G)reen, and (B)lue light are added together in to reproduce a broad array of colors.

What is resolution?

The dimensions of how many pixels you can fit on a screen.

What is density?

The number of pixels per given area.

How many colors in the standard RGB model?

16,777,216

What year was the first digital image?

1957

how many binary digits equal 1 pixel?

24

How many different values can be represented by one Red component of a pixel?

256 (0 to 255)

how many hexadecimal digits represent 1 pixel?

6

How many bits for each RGB?

8 bits each

What is hexadecimal?

A base-16 number system that uses sixteen distinct symbols 0-9 and A-F to represent numbers from 0 to 15.

What was the subject of the first digital image?

Baby picture

Describe a function that would take in any RGB value and double its intensity. What do you think happens if the input is 200, 220, 209?

R x 2, G x 2, Y x 2 Possible answers: The numbers cycle around beyond 255 back to the 0 side (145, 185, 163). The numbers max out and become 255, 255, 255.

Why do RGB values range from 0 to 255?

RGB values are represented by 8 bits, where the min value is 0 and the max is 255.

What are screen resolution and pixel density? How do they differ?

Screen resolution is the number of pixels on a screen as arranged vertically and horizontally, and density is the number of pixels per a given area. Pixel Density - Same resolution, but phone has more density

What is a pixel?

Short for "picture element", the fundamental unit of a digital image, typically a tiny square or dot that contains a single point of color of a larger image.

Can they be any other range?

While 8-bit ( 0-255) is the common range for each color channel today, there are no theoretical bounds on the range. The range is arbitrary. So the range could be different as long as everyone agreed on the format, or protocol for it.

What impact does x-50 have and x+50?

X-50 darkens the image and x+50 brightens the image.