Today, you will build a photo-editing program while you learn about an important computerscience concept called message passing.
You have probably sent a message to a friend asking them to do something.
In Scratch, “broadcasting” works the same way.
Broadcasting sends a message from one part of a program to another.
In this example, when you click the color button, the program sends a message to theimage sprite to change the color.
Broadcast is also used in television.
Television stations broadcast news and shows, which are then received by the individualTVs in your home.
Pictogram, the tool you will create today, is inspired by the popular photo-sharing application,Instagram.
Instagram allows users to apply digital filters to images to change how they look.You willcreate a Pictogram tool that lets the user change the color, lightness, sharpness, andother qualities of images.
To create your Pictogram tool, you’ll begin with a starter project.
This project contains several sprites and a backdrop.
You will program the button sprites to send messages to the image sprites to change theway they look.
To get started: Click on the starter project link, click "remix,"and sign in to Scratch.
Then, return to CS First to watch the next video and learn how to broadcast a “changecolor” message from a button sprite to the image sprites.
"How To Take Better Instagram Photos! | Aspyn Ovard" by Aspyn Ovard (https://www.youtube.com/watch?v=waVmXBiAZ6E) -- Licensed by Creative Commons Attribution 3.0 Unported (https://creativecommons.org/licenses/by/3.0/legalcode) -- Video trimmed to needed length | Audio removed
"Broadcasting1.JPG" by creator-bz (https://commons.wikimedia.org/wiki/File:Broadcasting1.JPG) -- Licensed by Creative Commons Attribution 3.0 Unported (https://creativecommons.org/licenses/by/3.0/legalcode) -- Image scaled up, cropping edges
"Lassina Zerbo interviewed by China Central Television.jpg' by The Official CTBTO Photostream (https://commons.wikimedia.org/wiki/File:Lassina_Zerbo_interviewed_by_China_Central_Television.jpg) -- Licensed by CC BY 2.0 (https://creativecommons.org/licenses/by/2.0/deed.en) -- Image scaled up, cropping edges