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Questions and Answers
What is the primary advantage of Lossless compression?
What is the unit of measurement for the number of pixels displayed per inch on a printer?
What type of graphics are rendered using mathematical formulas?
What determines the smoothness of a video?
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What is the purpose of Color Depth in digital images?
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What is the difference between a Raster image and a Vector image?
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What is the primary advantage of using a higher bitrate for audio files?
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What is the benefit of using a lossless compression format like FLAC or ALAC?
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What is the primary advantage of using a higher resolution for video files?
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What is the purpose of the 'alt' attribute in HTML?
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What is the primary purpose of CSS in web development?
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What is the primary difference between internal and external CSS stylesheets?
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Study Notes
Image Compression
- Image compression reduces file size, but may compromise image quality
- Lossless compression reduces image size without quality loss
- Uncompressed images retain original quality and size
- Colour depth is measured in bits
Image Size and Resolution
- Image size is measured in pixels (width x height)
- Resolution refers to the level of detail an image holds
- PPI (pixels per inch) measures pixel density
- DPI (dots per inch) is used for printing
Graphics and File Types
- Vector graphics use mathematical formulas and are resolution-independent
- Raster graphics are made up of pixels and are resolution-dependent
- File types: BMP, PNG, JPEG, GIF, TIFF (raster); SVG (vector)
Audio Compression
- Lossless compression (WAV, FLAC, ALAC) preserves audio quality
- Lossy compression (MP3, AAC) reduces file size but compromises quality
- Bitrate affects audio quality, with higher bitrates resulting in better quality
Video
- Frame rate (FPS) affects video smoothness
- Aspect ratio refers to the width-to-height ratio of a video
- Resolution affects video quality and file size
- File types: AVI, MKV, MP4 (compressed or uncompressed), WebM (lossless)
Web Development
- A simple webpage typically consists of: header, menu or navigation, content area, and contact information
- HTML tags:
for alternate text,for URL,for unique element ID,for image URL - CSS (Cascading Style Sheets) is used to add style to a webpage
- There are three types of CSS: external, internal, and inline
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Description
Test your knowledge of image compression, including file compression, image quality, colour depth, resolution, and vector graphics. Learn about the different types of compression, image size, and the details of image displays.
