Image representation is the way a computer stores a picture as numeric data. Most digital images are made of pixels arranged in a grid, where each pixel stores color information such as red, green, and blue values.
A digital image is a giant colored spreadsheet: each square has a position and a color value.
Showing a random 20 of 50 problems.
Example 1
easy
A black-and-white scanner uses 1 bit per pixel. What two values can a pixel hold?1-bit-per-pixel scanner — what two values can a pixel hold?
Example 2
easy
With 24-bit color (8 bits per RGB channel), how many distinct colors can be represented?How does color count grow with bit depth? At 24-bit: 2^24 = ?
Example 3
challenge
A photographer claims '12-bit RAW captures 4 times more color detail per channel than 10-bit.' Verify or correct the claim using level counts.
Example 4
medium
An image with a 256-color palette stores 8 bits per pixel. How does this compare in size per pixel to true-color 24 bpp?
Example 5
easy
What RGB triple represents pure green at 8 bits per channel?8-bit per channel RGB pixel for pure green — what is the RGB triple?
Example 6
challenge
You must store a 4000×3000 photo at 24 bpp, but the disk has only 30 MB free (use 1 MB=8,000,000 bits). What minimum compression ratio is required?
Example 7
easy
A pixel has RGB value (0, 0, 255). What color does it represent?Pixel with RGB value (0, 0, 255) — what color does it represent?
Example 8
easy
Estimate the uncompressed size in bits of a 50×50 grayscale image at 8 bits per pixel.
Example 9
medium
A 24-bit image is converted to an 8-bit palette image. By what factor does the per-pixel storage shrink, and what is lost?
Example 10
hard
Compare 8-bit and 10-bit per channel for one channel: how many MORE levels does 10-bit provide, and by what factor?
Example 11
hard
Two images have the same file size in KB but different dimensions: one is 1000×1000 at 8 bpp, the other is 500×500 at 32 bpp. Which has more pixels, and which stores more color information per pixel?
Example 12
easy
Each pixel stores 8 bits for red, 8 for green, 8 for blue. How many bits per pixel is this?
Example 13
medium
A pixel has RGB value (255, 255, 0). State the color it shows on screen.Pixel RGB (255, 255, 0) shown in binary — what color does it show on screen?
Example 14
medium
Fill in: a JPEG compressed file has the same ____ as the raw image but smaller ____.
Example 15
medium
A pixel stored as binary RGB is `11111111 00000000 11111111`. What color is it in words and decimal RGB?Pixel binary RGB: 11111111 00000000 11111111 — identify the color and decimal RGB
Example 16
easy
Fill in: doubling only the WIDTH of an image multiplies the total pixel count by ____.
Example 17
easy
An image is 200×100 pixels. How many pixels does it contain?
Example 18
medium
A pixel stored as binary RGB is `00000000 11111111 00000000`. State the color and the decimal RGB.Binary pixel: 00000000 11111111 00000000 — state the color and decimal RGB
Example 19
medium
A grayscale photo uses 8 bits per pixel. How many gray shades can a pixel display?Grayscale: 8 bits per pixel — how many gray shades can a pixel display?
Example 20
easy
An image is 100 pixels wide and 50 pixels tall. How many pixels does it contain?