Admin Table of Contents
How many bytes are required to represent each image?
Compatible File Types
| Image Type | Bytes per pixel | Compatible File Types |
|---|---|---|
| 1-bit Line art | 1/8 byte per pixel | TIF, PNG, GIF |
| 8-bit Indexed Color | Up to 1 byte per pixel if 256 colors | TIF, PNG, GIF |
| 8-bit Grayscale | 1 byte per pixel | Lossy: JPG Lossless: TIF, PNG |
| 16-bit Grayscale | 2 bytes per pixel | TIF, PNG |
How many bits does an image have?
In its simplest form, an image is a table of pixels each of which has 24 Bits of information.
How many bits are used to store a pixel?
Using 16 bits per color channel produces 48 bits, 281,474,976,710,656 colors. If an alpha channel of the same size is added then there are 64 bits per pixel.
What is basically a representation of an image?
In computer science, the representation of an image can take many forms. Most of the time, it refers to the way that the conveyed information, such as color, is coded digitally and how the image is stored, i.e., how is structured an image file.
Why do color images require more bits per pixel than black and white images?
Simply put, the file size of an image increases with bit depth because more color information is stored per pixel in an image having higher bit depth. For example: An image with a bit depth of 1 has pixels with two possible values: black and white. An image with a bit depth of 8 has 28, or 256, possible values.
How many bytes are in a .jpg image?
2.1- Bytes and File size
| File type | Size as # of pages, minutes, seconds, or dimensions | Size of file in Bytes, KB, MB, GB, etc. |
|---|---|---|
| page of plain text (.txt) | About 500 words, or 2500 characters | 2500 Bytes, 2.5KB |
| .jpg image | 1 imige | 10kb |
| animated .gif image | 30 frames | 8kb |
| .pdf file | 5 pages | 20kb |
How many bits do you need to represent 4 colors?
Colour depth
| Colour depth | Available colours |
|---|---|
| 3-bit | 2 3 = 8 |
| 4-bit | 2 4 = 16 |
| 5-bit | 2 5 = 32 |
| 6-bit | 2 6 = 64 |
What happens if you have an image that has 6 bits per pixel and you change it to 12?
What happens if you have you an image that has 6 bits-per-pixel and you change it to 12? You will see a variety of different colors in the image, and the image will look scrambled.
Why must at least two bits be used to represent each pixel?
The number of bits indicates how many colours are available for each pixel. In the black and white image, only two colours are needed. The greater the colour depth (bits per pixel), the more colours are available.
Which representation is efficient for image processing?
Chain coding is an efficient representation. For example, if the image dimensions are N = M = 512 , then representing the contour by storing the coordinates of each contour point requires six times as much storage as the chain code.
How can images be represented?
Digital images are made up of pixels. Each pixel is represented by a binary number. Consider a simple black and white image. If 1 is black (or on) and 0 is white (or off), then a simple black and white picture can be created using binary.
Which is the least significant bit in a number?
The least significant bits have the useful property of changing rapidly if the number changes even slightly. For example, if 1 (binary 00000001) is added to 3 (binary 00000011), the result will be 4 (binary 00000100) and three of the least significant bits will change (011 to 100).
Which is the most significant bit in an image?
For an 8-bit image, 0 is encoded as 00000000 and 255 is encoded as 11111111. Any number between 0 t0 255 is encoded as one byte. The bit in the far left side is referred as the Most Significant Bit (MSB) because a change in that bit would significantly change the value encoded by the byte.
How is each pixel of a bitmap image represented?
A digital image showing how each pixel of a bitmap image can be represented in binary using 1 bit. Bitmap images are made up of individual pixels. The colour of each pixel is represented as a binary number so the whole image is therefore stored as a series of binary numbers.
How are binary numbers used to represent an image?
If more memory bits are used to represent each pixel then more combinations of binary numbers are possible so more colours are possible in the image. Vector images store information as mathematical instructions rather than as individual pixels. For example, to save a vector image of a circle the software only needs to store: the image scale.