Part of Unit: The Art of Seeing
Lesson Plan Overview / Details
Understand the building block of digital imaging, the pixel. Using math, you can calculate the correct size for your digital printing 300 dpi or computer screen 72ppi presentation.
Computer lab with Photoshop and basic cropping knowledge in Adobe Photoshop
- 10 Minutes
- Lecture 25
- 25 Minutes
- Student Practice
- 25 Minutes
- 20 Minutes
California Career and Technical Education Standards
Objectives and Goals
The student will understand the vocabulary of digital imaging. The student will create a high resolution digital image for printing and scale it in Photoshop by cropping to a low resolution image for the web, understanding the difference between the two.
Activities in this Lesson
- Jelly Beans and Pixels - Hooks / Set
Ask the question...What do a jelly bean, dab of paint and a square have in common?
Short 5 slide presentation with a picture done in jelly beans, an impressionistic painting done with paint dabs and a digital image composed of pixels.
- What do a jelly bean,.ppt [ Download ] 5 slide presentation with a jelly bean portrait
- Presentation for teacher - Lecture
This is a presentation about digital resolution for the teacher to present on a computer with an LCD projector.
- Digital Resolution Lecture in Powerpoint [ Download ] This is a presentation about digital resolution for the teacher to present on a computer with an LCD projector.
- Digital Resolution Lecture in Keynote [ Download ] This is the same presentation about digital resolution for the teacher to present on a computer with an LCD projector
- Student practice - Guided Practice
Open Photoshop and crop a photo for printing at 300 ppi, then crop the photo at 72 ppi to use on the web as viewed on a computer screen understanding the difference in quality.
- Assessment Types:
- Teacher-Made Test,
Here is a quiz with teacher answer sheet to test understanding of resolution in .pdf format.
- Quiz [ Download ] Quiz to measure understanding of resolution and pixels needed.
- 9 to 12
- Industries and Pathways:
- Arts, Media & Entertainment
- Specialized Program:
- Online Course/Program
- Interpolation is the process of "stretching" a digital image by adding pixels that were not there originally. Since every pixel must have a color, this process usually involves assigning an intermediate color to the "invented" pixels based upon the colors of the pre-existing pixels surrounding the new ones.
- The total number of pixels in an image which can be calculated by multiplying pixel columns by pixel rows and dividing by one million.
- Pixels are the building blocks of every digital image. Clearly defined squares of light and color data are stacked up next to one another both horizontally and vertically. Each picture element (pixel for short) has a dark to light value from 0 (solid black} to 255 (pure white). That is, there are 256 defined values.
- Print resolution
- 300 pixels per inch is a standard print resolution
- The term resolution is used for measurement with pixels as the unit of measurement in digital imaging.
- Screen resolution
- 72 pixels per inch is a standard screen resolution used for web images