Create Glitch Art Online Add digital glitch artifacts with RGB shifting and scan lines.

The tool works by using the HTML5 Canvas API to manipulate the image data. When an image is uploaded, it is drawn onto a canvas element using the `drawImage` method, and then the image data is retrieved using `getImageData`. The RGB channels are then offset horizontally by random amounts, which creates the glitch effect. This is achieved by iterating over each pixel in the image data and shifting its red and blue channels by a certain amount, determined by the intensity slider. The shift amount is calculated as a fraction of the intensity value, with higher intensities resulting in larger shifts.

The tool also uses a technique called databending, where random horizontal strips of pixels are shifted vertically. This is done by iterating over each row of pixels in the image data and shifting it by a random amount, again determined by the intensity slider. The number of rows to shift is also calculated based on the intensity value, with higher intensities resulting in more rows being shifted. The `Uint8ClampedArray` data structure is used to store the manipulated image data, which ensures that the pixel values remain within the valid range.

The React library is used to handle user interactions, such as uploading an image and adjusting the intensity slider. When the user clicks the "Apply" button, the `processImage` function is called, which executes the glitch effect algorithm on the uploaded image. The resulting image data is then put back onto the canvas using `putImageData`, and the canvas is converted to a PNG file using the `toDataURL` method. The file can then be downloaded by the user. The tool uses JavaScript's built-in `URL.createObjectURL` and `URL.revokeObjectURL` methods to handle the image upload and download process, ensuring that the image data is properly cleaned up when it is no longer needed.

The intensity slider is implemented using an HTML `input` element with a `range` type, which allows the user to adjust the intensity value between 5 and 100. The `setIntensity` function is called whenever the user interacts with the slider, updating the intensity value and triggering a re-render of the glitch effect. The tool's use of React's `useState` and `useCallback` hooks ensures that the component state is properly updated and that the glitch effect algorithm is only re-run when necessary, improving performance and reducing unnecessary computations.