Representing Data Flashcards
Binary is base
2
All data ad instructions are in…
BINARY
Denary is base
10
Hexadecimal is base
16
1 bit per pixel is…
2colours black and white, monochrome
10x10 image needs 100 bits
4 bits (a nibble) per pixel is…
Greyscale
1x10 image needs 400 bits
3 bytes per pixel is…
Full colour, 1 byte for red, 1 for green and 1 for blue
10x10 image needs 300 bytes
16bpp is called…
High colour
What is true colour
24bpp
What is the resolution
The number of pixels per unit. The more pixels per inch, the more data to be stored and the larger the file
What is a bitmap image
An image where every pixel is defined.
Adv. of bitmap
Can change every pixel, strong control
Can use for photo realistic images as lots of Pixels and very complex
Disad of bitmap
Gets pixelated if zoom too much
Bigger file size than vector
More colours=
Larger file size
What is a vector image
A image created with the mathematical and geometrical data
Adv. of vector
Does not get pixelated
Small file size
Disad. Of vector
No control over individual pixels
Cannot create photo realistic images
Compression techniques:
Used to reduce file size. JPEG /JPG used for photos Png used for website images Gif used for animations NEVER photos Bmp used for drawing in paint
The higher the sample interval…
The lower the sample rate
When sound is sampled at a low rate..
Few samples taken
Poor match between original sound and sampled sound
Small file size
When sampled at a high rate…
More samples taken
Good mTch between original and sampled sound
Large file size required
Bit rate
Is the amount of space used for each sample
Operator
The instruction
Operand
The data part
