As you may know, PhotoFlow is an open-source, non-destructive photo editing software for adjusting photos from RAW images to high-quality printing.

Main features:
- Fully non-destructive, layer-based photo editing workflow with realtime preview of the final image
- Support for 8-bits and 16-bits integer as well as 32-bits and 64-bits floating point precision, selectable at runtime and on a per-image basis
- Plugin-based architecture: new tools can be implemented as separate modules that are loaded at runtime
- Allows to load and edit images of arbitrary size, thanks to the underlying rendering engine based on the VIPS library
- Fully color managed workflow: user-defined input, work and output profiles, soft-proofing, etc…
- Support for layer grouping and layer masks
- Support for common photo editing tools: levels, curves, brightness-contrast control, blurring, sharpening, cropping, resizing, colorspace conversions, etc…, all implemented in the form of image layers
- User-friendly interface to develop new tools and image filters as external plugins
For more information about this PhotoFlow, see the project’s official website.
The latest version available is PhotoFlow 0.2.5, which comes with changes.
New features:
- Freehand drawing: added brush feathering and improved painting performances. Added Ctrl+Alt+left_click mouse combination to continue last stroke.
- Implemented first version of spline path mask tool.
- HSL mask: added mask inversion.
- Lens correction: bundled LensFun version 0.3.2. This fixes a crash of the lensfun module under Ubuntu.
Bug fixes:
- Clone stamp: fixed bug in region selection affecting strokes after the first one
- Fixed compilation issues under Fedora 23
Installation instructions:
For Ubuntu systems, Photoflow is available via some third party PPA, so installing it on your Ubuntu 15.04 Vivid Vervet, Ubuntu 14.04 Trusty Tahr and derivative systems like Linux Mint 17.2 Rafaela, Linux Mint 17.1 Rebecca, Linux Mint 17 Qiana, Pinguy OS 14.04, Elementary OS 0.3 Freya, Deepin 2014, Peppermint 6, Peppermint 5, LXLE 14.04 and Linux Lite 2 is easy. Just add the PPA to your system, update the local repository index and install the photoflow package:
$ sudo add-apt-repository ppa:dhor/myway
$ sudo apt-get update
$ sudo apt-get install photoflow
Optional, to remove photoflow, do:
$ sudo apt-get remove photoflow
For Fedora 22, Photoflow is available via the COPR repositories, so you need to install the needed dnf plugin, enable the photoflow repository and install the package:
$ sudo dnf install dnf-plugins-core
$ sudo dnf copr enable oleastre/PhotoFlow
$ sudo dnf install photoflow
Optional, to remove photoflow, do:
$ sudo dnf remove photoflow