Codetown ::: a software developer's community
Welcome to Kotlin Thursdays! Last week, we were able to render an image with TornadoFX and even manipulate its pixels. Today, we will go over Pixel Math!
Think of these resources as supplemental if you happen to be more curious. We always encourage looking into documentation for things you use!
Last week, we got the hang of how to grab these pixels and do something with them. Today, we're going to expand by creating our own filters using operational pixel manipulation.
For all practical purposes, we're going to be talking about monochromatic images. If we try to write filters using colored pixels, it will prove a lot more difficult to work with RGB values as opposed to just black or white.
Best we learn to walk before we start trying to fly!
In order to create our own image filters, we need to have a solid understanding of pixel math, or binary operations.
Binary operations are the bread and butter of computers! You can compute operations on binary values 1 and 0.
AND - both inputs must be true for the output to be true
0 && 0 = 0
0 && 1 = 0
1 && 0 = 0
1 && 1 = 1
OR - one or both inputs must be true for the output to be true
0 || 0 = 0
0 || 1 = 1
1 || 0 = 1
1 || 1 = 1
NOT - inverse result
!0 = 1
!1 = 0
!(0 && 0) = 1
!(1 || 1) = 0
Likewise, if we assign the color BLACK to 1 and the color WHITE to 0, we can easily apply binary operations to to the binary values black and white. Working with colors gets significantly more difficult when there are RGB values to consider. There are other binary operations like XANDS, XORS, and XNORS, but for now, let's just focus on the first three.
Now that we understand how OR, AND, and NOT works, let's implement these functions with colors.
fun or (a: Color, b: Color) {
return if (a == Color.BLACK || b == Color.BLACK) {
Color.BLACK
}
else { Color.WHITE
}
fun and (a: Color, b: Color) {
return if (a == Color.BLACK && b == Color.BLACK) {
Color.BLACK
} else {
Color.WHITE
}
}
fun not (color: Color) {
return if (color == Color.BLACK) Color.WHITE else Color.BLACK
}
You'll notice that these functions are for pixel colors only. Next week, we look into higher-order functions in Kotlin to learn how we can pass functions as a parameter - but you'll welcome to check out the video to see how we can apply one of these primitive filters to our images! See you next week :)
Tags:
Codetown is a social network. It's got blogs, forums, groups, personal pages and more! You might think of Codetown as a funky camper van with lots of compartments for your stuff and a great multimedia system, too! Best of all, Codetown has room for all of your friends.
Created by Michael Levin Dec 18, 2008 at 6:56pm. Last updated by Michael Levin May 4, 2018.
Check out the Codetown Jobs group.
Hashicorp recently released the version 2.3 of Terraform Cloud Operator for Kubernetes with a new feature: the ability to initiate workspace runs declaratively. The Terraform Cloud Operator for Kubernetes was introduced in November 2023 with the goal to provide a Kubernetes-native experience while leveraging Terraform workflows
By Claudio MasoloMore projects from the CNCF incubated level are preparing to graduate for an ever-widening cloud native ecosystem. The Backstage community has worked on a more robust architecture, and Crossplane aimed to improve its developer DX. KubeFlow and Volcano, both tools promising to improve AI adoption within the Kubernetes ecosystem, are working on easier installation and more features, respectively.
By Olimpiu PopAccording to Marijn Huizenveld, discipline is key to preventing accumulating technical debt. In order to be disciplined you should make it difficult to ignore the debt. Heuristics like fixing small issues immediately, agreeing on a timebox for improvement, and making messy things look messy, can help tame technical debt.
By Ben LindersElon Musk announced that xAI would make its AI chatbot Grok open source, and now the release is accessible on GitHub and Hugging Face. This move enables researchers and developers to expand upon the model, influencing how xAI evolves Grok in the face of competition from tech giants like OpenAI, Meta, Google, Microsoft, and others.
By Daniel DominguezWilliam Chen discusses the importance of trimming your computational graph, storing data in multiple formats, leveraging open source, and considering multiple dimensions of modularization.
By William Chen© 2024 Created by Michael Levin. Powered by