I’d like to share iPhotro v4.0.0, a free and open-source, local-first photo manager that recently gained a set of advanced color grading tools.

This release focuses on giving photographers precise control over color and tone, while keeping a clean, non-destructive workflow and a familiar, macOS-like interface.

Color Grading & Tone Control

iPhotro now includes a full, professional-style color toolset:

• Color Curves

  • Master RGB curve plus individual Red, Green, and Blue channels

  • Fine control over shadows, midtones, and highlights

  • Real-time preview while editing

• Levels

  • Histogram-based tonal adjustment

  • Per-channel (RGB) control for accurate contrast and exposure correction

• Selective Color

  • Targeted adjustment of six color ranges (Red, Yellow, Green, Cyan, Blue, Magenta)

  • Independent control of hue, saturation, and luminance

  • Useful for skin tones, skies, foliage, and product colors

• White Balance

  • Eyedropper sampling for neutral gray or skin tones

  • Temperature and tint controls for fine correction

All adjustments are non-destructive and stored in sidecar files, so original photos are never modified and edits can be revisited or removed at any time.

Workflow & Philosophy

• Local-first: no cloud, no accounts

• Non-destructive editing by design

• Smooth, distraction-free UI inspired by macOS photo apps

• GPU-accelerated previews for responsive color editing

Who It’s For

• Photographers looking for a FOSS alternative for managing and grading local photo libraries

• Users who want advanced color tools without subscriptions

• Anyone interested in open-source photography workflows

iPhotro is not trying to replace Lightroom overnight, but to provide a free, open, and transparent photo workflow with serious color control.

Release (v4.0.1):
https://github.com/OliverZhaohaibin/iPhotron-LocalPhotoAlbumManager/releases/tag/v4.0.1

Source code (FOSS):
https://github.com/OliverZhaohaibin/iPhotron-LocalPhotoAlbumManager

Feedback from photographers is very welcome — especially around color tools and workflow expectations.