1. What is Pixel Aspect Ratio?

Pixel Aspect Ratio (PAR) is the ratio of width to height of a single pixel in a digital image. It describes how pixels should be displayed to maintain proper proportions when the storage aspect ratio differs from the display aspect ratio.

2. How Does the Calculator Work?

The calculator uses the Pixel Aspect Ratio formula:

Where:

• Display Aspect Ratio — The aspect ratio of the display device
• Storage Aspect Ratio — The aspect ratio of the stored image

Explanation: When PAR = 1, pixels are square. When PAR ≠ 1, pixels are rectangular and need to be scaled appropriately during display.

3. Importance of Pixel Aspect Ratio

Details: Correct PAR ensures images and videos display with proper proportions. It's crucial in video production, digital imaging, and when converting between different video standards.

4. Using the Calculator

Tips: Enter both aspect ratios as dimensionless values (e.g., 16/9 = 1.777..., 4/3 = 1.333...). Both values must be greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between PAR and Display Aspect Ratio?
A: Display Aspect Ratio describes the screen dimensions, while PAR describes the shape of individual pixels needed to display content correctly.

Q2: When is PAR not 1:1?
A: Common in SD video formats (e.g., DV NTSC has PAR of 10:11) and when converting between different video standards.

Q3: How does PAR affect image quality?
A: Incorrect PAR causes stretching or squashing of images. Proper PAR maintains original proportions.

Q4: What's a common example of PAR in use?
A: DVDs often use non-square pixels to store widescreen content in standard definition resolutions.

Q5: How does PAR relate to resolution?
A: PAR connects the storage resolution to the intended display aspect ratio, ensuring proper proportions regardless of pixel dimensions.