Monday, October 10, 2016

Non-destructive Lab editing with GIMP and the PhotoFlow plug-in

Since a while PhotoFlow is also available in the form of a GIMP plug-in. It means that PhotoFlow can be used directly within GIMP, to open and process RAW images as well as to apply non-destructive editing to any GIMP layer.

The most simple way to use GIMP in combination with the PhotoFlow plug-in under Linux is to download and run the AppImage package that is hosted on the web site. This screencast explains the details of how to run the GIMP AppImage and briefly introduces the tools that are provided with it.

One of the possibilities offered by the PhotoFlow GIMP plug-in is to apply non-destructive edits in Lab colorspace to any GIMP layer. The Lab colorspace (or better CIELab) is an alternative representation of the pixel data that, unlike RGB, separates the luminance information from the color information. It is therefore possible for example to adjust the luminance of the image without changing the color components, or to adjust the color saturation in a way that is more natural and pleasing than in RGB.

Let's see how this works in practice.

Monday, March 21, 2016

PhotoFlow version 0.2.6 released

A new PhotoFlow version 0.2.6 is out!

This new version comes with lots of new or improved features and an updated GUI, including a better layout of the filters controls and an handy lateral toolbox that provides shortcuts for some of the most commonly used filters:

The image in the preview area is courtesy of Andrea Katifes

Monday, December 7, 2015

New PhotoFlow version 0.2.5

A new PhotoFlow version 0.2.5 is out!

This version bring two new cool features that will make the creation of local masks even easier:

  • A path selection tool that creates a closed region by connecting user-defined control points with a spline curve. It also provides an optional smooth falloff edge for feathering the selection. The path selection tool is similar to the path mask in Darktable, and most of the source code is actually derived from Darktable.
    This tool is particularly useful to generate smooth layer opacity masks for local editing.
  • A smoothing option for the brush of freehand drawing tool, with an adjustable smoothness:

Monday, November 2, 2015

New PhotoFlow version 0.2.4 released

The next PhotoFlow version 0.2.4 is out!
This is a maintenance release, only providing bug fixes and no new features.
The complete changelog for version 0.2.4 can be found here.

Tuesday, October 27, 2015

New PhotoFlow version 0.2.3 released

The next PhotoFlow version 0.2.3 is out!
The source code, as well as OSX and Windows installers, are available from the github repository.
For Ubuntu users, the updated packages are available from the Highly Explosive PPA.
Updated archives for Arch Linux are also available from the github repository.

This new version includes several new features and improvements:

  • The list of available RAW demosaicing methods now includes the LMMSE algorithm, ported from RawTherapee. LMMSE is in many cases the optimal choice for noisy and/or high-ISO images.
  • Added new impulse noise reduction tool, based on the equivalent tool from RawTherapee
  • Added new perspective correction tool, based on the "keystone perspective correction" from Darktable.
  • A reset button is now available to restore the tools parameters to their default values

  • The complete changelog for version 0.2.3 can be found here.

    Sunday, October 4, 2015

    New PhotoFlow version 0.2.2 released

    The next PhotoFlow version 0.2.2 is out!
    The source code, as well as OSX and Windows installers, are available from the github repository.
    For Ubuntu users, an updated package will most likely be available in the next few days.

    This new version includes few major improvements:

    RGB histogram visualization
    An RGB histogram has appeared above the layer list, on the top-left part of the application window. The histogram shows the RGB values of either the merged output or the sticky layer, depending which one is activated in the GUI.

    Interactive editing of gradients shape
    It is now possible to modify the shape of an horizontal or vertical gradient by means of control points that are added and modified directly in the preview area. This new feature is accessible when the editing mode of the gradient tool is activated, as shown in the screenshot below.