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# Image Size and Resolution Calculation Quiz

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## Questions and Answers

### What best describes a raster image?

It consists of elements like pixels.

EPS

Rasterization

### What is the spatial resolution of an image mainly dependent on?

<p>Number of pixels per unit length</p> Signup and view all the answers

### Which factor affects an image's ability to represent fine details?

<p>Resolution</p> Signup and view all the answers

### Why is it recommended to avoid digital zoom for capturing a large image with good detail representation?

<p>Digital zoom introduces probable pixels between real ones.</p> Signup and view all the answers

### What does DPI stand for in relation to digital images?

<p>Dots per Inch</p> Signup and view all the answers

### Which file format is NOT typically associated with raster images?

<p>.SVG</p> Signup and view all the answers

### What is the primary difference between a raster image and a vector image?

<p>Raster images show smooth structure when zoomed while vector images show colored elements.</p> Signup and view all the answers

## Study Notes

### Image Size and Resolution

• Image size refers to the number of pixels in a digital image, measured in width x height.
• Resolution is the number of pixels per inch (PPI) or dots per inch (DPI), with higher resolution yielding better quality.

### Image Size Calculation

• Formula: Total image size = header size + data size
• Data size = width * height * no.of bits/pixel
• Example: 6x4 inch image at 150 PPI, header file size = 10 bytes, total image size = 67510 bytes = 65.92 Kbyte

### Gray Scale Image Size Calculation

• Formula: Data size = width * height * 8
• Example: 200x200 pixels, header file size = 80 bytes, total image size = 40080 bytes = 39.14 Kbyte

### Color Image Size Calculation

• Formula: Data size = width * height * 3 (for 24-bit color image)
• Example: 400x400 pixels, header file size = 100 bytes, total image size = ?

### 24-bit Color Images

• Each pixel is represented by three bytes, representing RGB
• Supports 256 x 256 x 256 possible combined colors, or a total of 16,777,216 possible colors
• Stored as 32-bit images, with an extra byte of data for Alpha value representing special effect information (e.g., transparency)

### Image Presentation

• Frame buffer: hardware used to store bitmap, typically on a graphics card
• If not enough video card memory, data is shifted around in RAM for display

### Digital Image Definition

• Raster image or bitmap: composed of elements that appear when zoomed
• Vector image: does not consist of elements, can be zoomed smoothly

### Vector vs. Raster Images

• Raster image: used for photorealistic images, typical formats include JPEG, TIFF, GIF, PNG, etc.
• Vector image: used for simple graphics and drawings, typical formats include EPS, AI, CDR, WMF, DXF, etc.

### How We See Digital Images

• Raster and vector images are projected into a raster of colored elements (pixels) when displayed or printed
• Resolution or spatial resolution is the number of pixels per unit of length, usually given as dots per inch (dpi)

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## Description

Test your knowledge on calculating image sizes and resolutions. This quiz covers concepts such as the number of pixels in a digital image, pixels per inch (PPI), dots per inch (DPI), and how to calculate binary image sizes based on resolution and dimensions.

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