How images are stored (pixels, resolution) in Intro to Computing - Quick Revision & Summary

Recall & Review

beginner

What is a pixel in a digital image?

A pixel is the smallest unit of a digital image, like a tiny colored dot. Many pixels together form the full picture.

beginner

What does image resolution mean?

Resolution is how many pixels are packed into an image, usually shown as width × height (like 1920×1080). Higher resolution means more detail.

beginner

How does resolution affect image quality?

Higher resolution means more pixels, so the image looks clearer and sharper. Lower resolution means fewer pixels and a blurrier image.

intermediate

How are colors stored in pixels?

Each pixel stores color using numbers for red, green, and blue (RGB). Mixing these colors in different amounts creates all colors you see.

beginner

Why does zooming in on a low-resolution image make it look blurry?

Zooming in shows individual pixels as big blocks because there aren’t enough pixels to keep the image sharp at larger sizes.

What is the smallest part of a digital image?

A Resolution

B File size

C Color depth

D Pixel

A pixel is the smallest unit of a digital image.

If an image has a resolution of 800×600, what does this mean?

A It has 800 pixels in width and 600 pixels in height

B It has 800 colors and 600 shades

C It is 800 kilobytes in size

D It takes 800 seconds to load

Resolution shows the number of pixels horizontally and vertically.

Which color model is commonly used to store pixel colors?

A HSV (Hue, Saturation, Value)

B CMYK (Cyan, Magenta, Yellow, Black)

C RGB (Red, Green, Blue)

D Grayscale

RGB is the standard color model for pixels in digital images.

What happens to image quality when you increase resolution?

A Image becomes clearer and more detailed

B Image becomes darker

C Image file size decreases

D Image colors change

Higher resolution means more pixels, so the image looks clearer.

Why do images look blocky when zoomed in too much?

A Because colors fade

B Because pixels become visible as large squares

C Because resolution increases

D Because the image file is corrupted

Zooming in shows individual pixels as blocks if resolution is low.

Explain how pixels and resolution work together to create a digital image.

Think of pixels as tiny dots and resolution as how many dots fit in the image.

Describe why an image with low resolution looks blurry when enlarged.

Imagine zooming in on a mosaic made of few tiles.