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[开源项目] PaintKit：不依赖 AppKit 的 Swift 光栅绘图引擎，去背景不用模型

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Valutazione

Difficoltà
1/5
Tempo stimato
Meno di un'ora
Idoneità per principianti
35/100
Tipo di issue
Documentazione
Chiarezza
Da chiarire
Stato di attività
Attiva
Stack tecnologico
swift
Ambito
content

Direzione di ricerca

Start by reviewing the linked PaintKit repository and its BACKGROUND_REMOVAL.md and A_GUARD_TUNED_TO_ITS_TEST.md documents. The submission contains no target file, requested edit, or acceptance criteria, so confirm the repository's contribution format and whether the project should be included before making any change.

Scritto dal modello di indicizzazione a partire dal testo della issue.

Descrizione

GitHub: https://github.com/joshlin2201/itspaint

自荐一个开源 Swift 包。PaintKit 是我的 Mac 画图和标注应用 ItsPaint 里的绘图引擎，作为独立的 SwiftPM library 发布。它没有 UI 层，不依赖 AppKit、SwiftUI 或任何第三方库，只用到 Foundation、CoreGraphics、ImageIO、CoreText 和 UniformTypeIdentifiers。最低支持 macOS 12，应用本身需要 macOS 14。

推荐理由：

  • 去背景不用模型。从图片四个角各做一次 flood fill，把它们的并集设为透明。它不是分割，只认得出“页面”，所以适合 logo、产品图、截图和扫描图，对头发没用。分不出背景时会直接说明，原图不动。实现和两个关键决定： https://github.com/joshlin2201/itspaint/blob/main/docs/BACKGROUND_REMOVAL.md
  • 像素用预乘 RGBA8 存储，每次编辑都返回改动的矩形，画布只重绘这一块。撤销历史的上限是内存占用，而不是步数。
  • 引擎没有 UI，所以大部分改动可以在终端里验证，构建只需要 Command Line Tools，不需要 Xcode。
  • 去背景的判断条件曾经连续三个版本是错的，测试却一直通过。复盘： https://github.com/joshlin2201/itspaint/blob/main/docs/A_GUARD_TUNED_TO_ITS_TEST.md

四行代码就能在本地去掉产品图的背景：

import PaintKit

let engine = PaintEngine(canvas: try ImageCodec.decode(contentsOf: input))
guard engine.removeBackground() else { fatalError("no background to remove") }
try ImageCodec.encode(engine.canvas, as: .png).write(to: output)

ItsPaint 本身免费，MIT 协议，也在 Mac App Store 上架。

English:

PaintKit is the drawing engine inside ItsPaint, my Mac paint and markup app, published as its own SwiftPM product. It has no UI layer and no dependencies. It imports Foundation, CoreGraphics, ImageIO, CoreText and UniformTypeIdentifiers and nothing else, and it supports macOS 12, even though the app needs 14.

  • Background removal with no model. It floods from all four corners and makes the union transparent. It is not segmentation, it only knows what a page is, so it works on logos, product shots, screenshots and scans and is useless on hair. When it cannot separate the background it says so and leaves the image alone. The walkthrough: https://github.com/joshlin2201/itspaint/blob/main/docs/BACKGROUND_REMOVAL.md
  • Pixels are premultiplied RGBA8, and every edit returns the rectangle it changed, so the canvas redraws only that area. Undo history is capped by memory rather than by a step count.
  • With no UI, most changes can be checked from a terminal, and it builds with the Command Line Tools alone.
  • The guard on background removal was wrong for three releases while its test passed. The write-up: https://github.com/joshlin2201/itspaint/blob/main/docs/A_GUARD_TUNED_TO_ITS_TEST.md

The four lines above remove the background from a product shot, on device.

The app is free, MIT licensed, and also on the Mac App Store.

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