# How To Change The Color Of A Pixel In Javascript

### FAQ?

#### How do I change the pixels in JavaScript?

1 Answer. // pick out pixel data from x, y coordinate var x = 20; var y = 20; var red = data[((imageWidth * y) + x) * 4]; var green = data[((imageWidth * y) + x) * 4 + 1]; var blue = data[((imageWidth * y) + x) * 4 + 2]; var alpha = data[((imageWidth * y) + x) * 4 + 3];

How do I access/change pixels in a javascript image object? - Stack ...

stackoverflow.com > questions > how-do-i-access-change-pixels-in-a-javas...

#### How do you make pixels yellow?

In this example we want to turn the Duke Blue pixels of the Duke logo yellow. Since only the white pixels have a red value of 255, we can use that condition in our if statement to identify the pixels we want to change. To turn the pixel yellow, we set its green and red values to 255 and blue value to 0.

Convert Blue to Yellow - Build Software Applications

www.dukelearntoprogram.com > course1

#### Can you use RGB in JavaScript?

JavaScript Function to Convert an Integer into a Hexadecimal var rgbToHex = function (rgb) { var hex = Number(rgb). ... length < 2) { hex = "0" + hex; } return hex; }; Now you can run the following function to covert any RGB value from 0 to 255 into the proper color hex value.

Learn How to Convert RGB Colors to Hexadecimal with Javascript

#### What is canvas in image processing?

You can use Canvas to draw new graphics or you can load existing images and process them at the pixel level. In this extract from a chapter in my new book on JavaScript Graphics we look at how it works.

JavaScript Canvas - Image Processing - I Programmer

www.i-programmer.info > programming > 13149-javascript-canvas-image-...