Digital Photography

Grade 7 · Art · Study Guide

Learn the fundamentals of digital photography, including camera settings, composition rules, and how digital images are captured and stored.

Digital photography uses electronic sensors to capture images instead of the chemical film used in traditional photography. When you press the shutter button, the camera's image sensor — either a CCD or CMOS sensor — records the light hitting it and converts it into digital data stored as an image file.

Three key camera settings control exposure — how much light reaches the sensor. Aperture is the opening in the lens that controls the amount of light; a wide aperture (low f-number like f/1.8) lets in more light and creates a blurry background called bokeh. Shutter speed is how long the sensor is exposed to light; a fast shutter speed freezes motion while a slow one creates blur. ISO measures the sensor's sensitivity to light; a higher ISO brightens the image but adds grain called noise.

Composition — how you arrange subjects within the frame — greatly affects the quality of a photograph. The rule of thirds divides the frame into a 3x3 grid, and placing key subjects at the intersections creates more dynamic images. Leading lines guide the viewer's eye through the photo, and framing uses elements in the scene to border the main subject.

Digital photos are stored in file formats like JPEG, which compresses the image to save space, or RAW, which retains all the sensor data for maximum editing flexibility.

Key terms

Aperture
The opening in a camera lens that controls how much light reaches the sensor; measured in f-stops (e.g., f/1.8, f/11)
Shutter speed
The length of time the camera's sensor is exposed to light; fast speeds freeze motion, slow speeds blur it
ISO
A measure of the camera sensor's sensitivity to light; higher ISO values brighten images but introduce digital grain (noise)
Rule of thirds
A composition guideline that divides the frame into a 3x3 grid and places key subjects at the grid intersections for a more dynamic image
Exposure
The amount of light that reaches the camera sensor, determined by the combination of aperture, shutter speed, and ISO
RAW file
An uncompressed image file format that retains all sensor data, giving photographers maximum flexibility when editing

Flashcards

Aperture
Lens opening controlling light intake; measured in f-stops — lower f-number = wider opening = more light
Shutter speed
Duration sensor is exposed to light; fast speeds (1/1000s) freeze motion, slow speeds (1/30s) create blur
ISO
Sensor sensitivity to light; high ISO brightens image but adds noise/grain
Rule of thirds
Composition grid dividing frame into 9 equal parts; placing subjects at intersections creates dynamic images
Bokeh
The aesthetic blur in the out-of-focus areas of a photo, created by using a wide aperture (low f-number)
RAW file
Uncompressed image format retaining all sensor data; preferred for professional editing
JPEG
Compressed image file format that reduces file size but discards some image data
Exposure triangle
The relationship between aperture, shutter speed, and ISO that together determine image brightness

Questions

  1. Which three camera settings together control the exposure of a photograph?

    1. Zoom, focus, and white balance
    2. Aperture, shutter speed, and ISO
    3. Resolution, file format, and flash
    4. Megapixels, color mode, and lens type
    Show answer

    Answer: Aperture, shutter speed, and ISO

    Aperture, shutter speed, and ISO form the 'exposure triangle' — the three fundamental settings that control how bright or dark a photo appears.

  2. A higher ISO setting makes a digital photo brighter but can also introduce digital grain called noise.

    Show answer

    Answer: True

    ISO amplifies the sensor's signal to capture more light, but higher amplification also picks up electronic interference, which appears as grain or noise in the image.

  3. The composition technique called the rule of _______ divides the frame into a 3x3 grid to help place subjects more dynamically.

    Show answer

    Answer: thirds

    The rule of thirds is a classic composition guideline where the frame is divided into nine equal sections; placing subjects at the four intersections creates more visually engaging images.

  4. A photographer wants to photograph a fast-moving athlete with no motion blur. Which setting should they adjust?

    1. Use a lower ISO
    2. Use a slower shutter speed
    3. Use a faster shutter speed
    4. Use a smaller aperture
    Show answer

    Answer: Use a faster shutter speed

    A fast shutter speed (e.g., 1/1000 of a second) captures movement so quickly that the subject appears frozen and sharp with no blur.

  5. A JPEG file retains all raw sensor data and gives photographers the maximum flexibility for editing.

    Show answer

    Answer: False

    JPEG compresses and discards some image data to reduce file size. RAW files retain all sensor data and offer maximum editing flexibility.

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