What is brightroom?

Brightroom is a Swift library for iOS that lets developers add a full photo editor to their apps. Rather than providing a fixed editor screen you drop in unchanged, it gives you building blocks that you can arrange and combine to create your own editing interface. The core of the library is an EditingStack, which tracks all of the edits a user makes (like a history log), handles rendering the final result, and can load images from a remote URL or from local storage. The rendering engine runs on Metal, Apple's low-level graphics API, which means edits are applied directly on the GPU and preview updates stay fast even on large photos. The library supports images up to 12,000 pixels on a side and handles P3 wide color gamut, the same color space used by Instagram. Both UIKit and SwiftUI are supported. Built-in capabilities include crop and rotation with a Photos-app-style interface, face detection, free-form masking (drawing a selection by hand over parts of the image), and custom color filters applied through LUT files. A LUT is a lookup table that maps original colors to new ones, which is a common technique for applying Instagram-style color grades. The library is available via Swift Package Manager and requires iOS 15 and Xcode 15.2 or later. It is on version 2, which renamed the project from Pixel to Brightroom. A companion open-source production app called Drip is available on the App Store and uses Brightroom as its photo editing engine, giving a real-world example of what the library looks like in a finished product. The license is MIT. A demo app is included in the repository for trying out the editing features locally.