Understanding image dimensions, aspect ratios, and file sizes is essential for web design and digital content creation. Key concepts:

Aspect Ratio

The proportional relationship between an image's width and height. Common ratios include:

• 1:1 - Square (Instagram posts)
• 4:3 - Standard (traditional monitors, some cameras)
• 16:9 - Widescreen (HD video, modern displays)
• 3:2 - Classic (35mm film, many DSLRs)
• 9:16 - Portrait (smartphone stories, reels)

Resolution and DPI

DPI (dots per inch) relates to print quality. For web use, 72 DPI is standard as screen resolution is measured in pixels.

File Size Estimation

File size depends on multiple factors:

• Image dimensions (width × height)
• Color depth and complexity
• Compression format and settings
• Metadata included