This document provides an overview of key photography concepts including pixels, megapixels, resolution, color modes, histograms, and preparing images for print in Photoshop. It defines pixels and megapixels, explains how to calculate megapixels from image dimensions. It also outlines the differences between screen and print resolution, RGB and CMYK color modes, and how histograms can be used to analyze image exposure. The goal is for the learner to understand these essential digital photography and editing fundamentals.
3. Recap
š Q: What is a pixel?
š A: The smallest editable component of
an image/display. A pixel can only
display one colour.
4. Recap
š Q: What is a megapixel?
š A: A megapixel is a measurement of
pixels by the millions
š 1 megapixel = 1 million pixels
5. Recap
š You can calculate a megapixel
by multiplying the image’s
width and height in pixels;
š For example;
š 4752 px wide X 3168 px high =
15,054,336 pixels or
15 megapixels
6. Resolution
š Image resolution is the detail an image holds
š Higher resolution means more image detail.
š Image resolution can be measured in various ways;
š DPI = dots per inch (measurement when referencing print files)
š PPI = pixels per inch (measurement when referencing digital files)
š Width x Height in pixels (1920 px x 1080 px = HD resolution)
9. Colour Modes
š When creating graphics, editing photographs, etc. for
different purposes, along with resolution, you need to
consider which colour mode you will be working in.
11. Colour Modes
RGB CMYK
š Red, Green, Blue
š Created with light
š Use for web/screen
š Start with black and add
amounts of light (RGB)
š Cyan, Magenta, Yellow,
Key (Black)
š Created with ink
š Use for print
š Start with white and add
amounts of ink (CMYK)