# How to find a colour on the screen?
**URL:** https://discourse.processing.org/t/how-to-find-a-colour-on-the-screen/30405
**Category:** Coding Questions
**Created:** [June 1, 2021, 5:31am UTC](https://discourse.processing.org/t/how-to-find-a-colour-on-the-screen/30405 "2021-06-01T05:31:31Z")
**Posts on this page:** 8
**Page:** 1
### Author:  [@MoonAlien822](https://discourse.processing.org/u/MoonAlien822)
#### Post date: [June 1, 2021, 5:31am UTC](https://discourse.processing.org/t/how-to-find-a-colour-on-the-screen/30405/1 "2021-06-01T05:31:31Z")
i have a colour value (11, 96, 133) and i want the program to tell me if there is any colour that is really similar or exactly the same. here is the rest of my code if its useful:
```auto
PImage screenshot;
import java.awt.Robot;
void setup() {
size(400,300);
}
void draw() {
try {
Robot robot = new Robot();
screenshot = new PImage(robot.createScreenCapture(new java.awt.Rectangle()(0,0,screen.width,screen.height)));
} catch (AWTException e) {
}
image(screenshot, 0, 0, width, height);
screenshot(0,0,width, height);
}
`
`
***1. > * Blockquote**
`
`
[quote="MoonAlien822, post:1, topic:30405, full:true"]
i have a colour value (11, 96, 133) and i want the program to tell me if there is any colour that is really similar or exactly the same. here is the rest of my code if its useful:
PImage screenshot;
import java.awt.Robot;
void setup() {
size(400,300);
}
void draw() {
try {
Robot robot = new Robot();
screenshot = new PImage(robot.createScreenCapture(new java.awt.Rectangle()(0,0,screen.width,screen.height)));
} catch (AWTException e) {
}
image(screenshot, 0, 0, width, height);
screenshot(0,0,width, height);
}
```
---
### Author:  [@glv](https://discourse.processing.org/u/glv)
#### Post date: [June 1, 2021, 5:55am UTC](https://discourse.processing.org/t/how-to-find-a-colour-on-the-screen/30405/2 "2021-06-01T05:55:57Z")
Hello,
Please format your code as per:
[https://discourse.processing.org/faq#format-your-code](https://discourse.processing.org/faq#format-your-code)
This is the same code as you provided here:
[https://discourse.processing.org/t/help-with-error-in-robot-class-and-createscreencapture-method/30396/1](https://discourse.processing.org/t/help-with-error-in-robot-class-and-createscreencapture-method/30396/1)
_ **I provided you with a link in the topic above to a working example that you can modify to get a PImage of the screen.** _
Please correct your code and then take the next step.
Once you get a PImage you can use get():
[https://processing.org/reference/get\_.html](https://processing.org/reference/get_.html)
See tutorial:
[https://processing.org/tutorials/pixels/](https://processing.org/tutorials/pixels/) _Intro To Image Processing_ section has a good example to work with!
[https://processing.org/tutorials/color/](https://processing.org/tutorials/color/)
`:)`
---
### Author:  [@MoonAlien822](https://discourse.processing.org/u/MoonAlien822)
#### Post date: [June 1, 2021, 6:09am UTC](https://discourse.processing.org/t/how-to-find-a-colour-on-the-screen/30405/3 "2021-06-01T06:09:07Z")
i think i fixed it. if i need to change anything else, just say so and i will change it.
---
### Author:  [@glv](https://discourse.processing.org/u/glv)
#### Post date: [June 1, 2021, 6:29am UTC](https://discourse.processing.org/t/how-to-find-a-colour-on-the-screen/30405/4 "2021-06-01T06:29:05Z")
Hello,
> [@MoonAlien822](#):
>
> i think i fixed it.
You formatted your code but did not do it correctly.
Take a look at it and you will see duplicate code… you can edit this.
> [@MoonAlien822](#):
>
> if i need to change anything else, just say so and i will change it.
That code does not work as is.
Take a look at your code and examples for some insight.
I was able to find an exact color on the screen and display x,y co-ordinates with the tips that I provided you:
- Here is a working example that I already provided to get a screen image:
_[Screen capture in Processing – Magic & Love Interactive](http://www.magicandlove.com/blog/2016/12/16/screen-capture-in-processing/)_
This example should help you correct your code.
This is just one example that I found and worked with.
- [https://processing.org/tutorials/pixels/](https://processing.org/tutorials/pixels/)
_Intro To Image Processing_ section has a good example to work with!
This will require some work on your part to complete.
`:)`
---
### Author:  [@glv](https://discourse.processing.org/u/glv)
#### Post date: [June 1, 2021, 11:11am UTC](https://discourse.processing.org/t/how-to-find-a-colour-on-the-screen/30405/5 "2021-06-01T11:11:28Z")
Hello,
You can get the desktop screen resolution with this to integrate with the other code:
[https://www.geeksforgeeks.org/java-program-to-print-screen-resolution/](https://www.geeksforgeeks.org/java-program-to-print-screen-resolution/)
The solution above was me doing some research.
There may be other ways to do it.
Example:
```auto
// https://www.geeksforgeeks.org/java-program-to-print-screen-resolution/
import java.awt.*;
Dimension screenSize;
int scrWidth;
int scrHeight;
void setup()
{
size(640, 480, P3D);
// This does not work!
//println(screen.width,screen.height);
//Another solution
screenSize = Toolkit.getDefaultToolkit().getScreenSize();
scrWidth = (int)(screenSize.getWidth());
scrHeight = (int)(screenSize.getHeight());
println("1: ", scrWidth, scrHeight);
noLoop();
}
void draw()
{
println("2: ", scrWidth, scrHeight);
}
```
And an _ **easier way** _:
[https://processing.org/reference/size\_.html](https://processing.org/reference/size_.html)
makes reference to:
> As of Processing 3, to run a sketch at the full dimensions of a screen, use the **fullScreen()** function, rather than the older way of using **size(displayWidth, displayHeight)**.
You can use:
```auto
// This does not work!
//println(screen.width,screen.height);
println(displayWidth, displayHeight);
```
I came across this looking here in some of the Processing source files:
[https://github.com/processing/processing/blob/master/core/src/processing/core/PApplet.java](https://github.com/processing/processing/blob/master/core/src/processing/core/PApplet.java)
Careful! You can get lost in there.
`:)`
---
### Author:  [@glv](https://discourse.processing.org/u/glv)
#### Post date: [June 1, 2021, 4:25pm UTC](https://discourse.processing.org/t/how-to-find-a-colour-on-the-screen/30405/6 "2021-06-01T16:25:06Z")
This post is continued here by @MoonAlien822 :
> [@How to check if the response from get is the same as color?](https://discourse.processing.org/t/how-to-check-if-the-response-from-get-is-the-same-as-color/30417):
>
> int x=1; int y=1; import java.awt.Robot; import java.awt.image.BufferedImage; import java.awt.Rectangle; color pas = color(11, 96, 133); //this is the color Robot robot; void setup() { size(1500, 3000); try { robot = new Robot(); } catch (Exception e) { println(e.getMessage()); } } void draw() { background(0); Rectangle r = new Rectangle(mouseX, mouseY, width, height); BufferedImage img1 = robot.createScreenCapture(r); PImage img2 = new PImage(img1); image(img2, 0, …
---
### Author:  [@MoonAlien822](https://discourse.processing.org/u/MoonAlien822)
#### Post date: [June 30, 2021, 9:07am UTC](https://discourse.processing.org/t/how-to-find-a-colour-on-the-screen/30405/7 "2021-06-30T09:07:39Z")
thank you, do you know how you, insead of finding the exact colour, can find something extremely simelar?
---
### Author:  [@glv](https://discourse.processing.org/u/glv)
#### Post date: [June 30, 2021, 10:06am UTC](https://discourse.processing.org/t/how-to-find-a-colour-on-the-screen/30405/8 "2021-06-30T10:06:39Z")
Hello,
> [@MoonAlien822](#):
>
> insead of finding the exact colour, can find something extremely simelar?
I made some suggestions in your topic here:
> [@ScreenCapture with Robot Class (code not working)](https://discourse.processing.org/t/screencapture-with-robot-class-code-not-working/30551/7):
>
> thank you for your help. sadly it doesnt work because on different distances it has a different colour value and wont recognise it. but thanks anyway
I had success comparing to a range of hues.
`:)`