gimp
GIMP is the multi-platform image manipulation tool stands for GNU Image Manipulation Program. It is a freely distributed piece of software for such tasks as photo retouching, image composition and image authoring. GIMP works on many operating systems and it is translated in many languages. It has many capabilities. It can be used as a simple paint program, an expert quality photo retouching program, an online batch processing system, a mass production image renderer, an image format converter, etc. GIMP is expandable and extensible. It is written and developed under X11 on UNIX platforms. Both stable and development version is available via 3rd party repositories.

Features Highlights:
  • Full suite of painting tools including brushes, a pencil, an airbrush, cloning, etc.
  • Tile-based memory management so image size is limited only by available disk space
  • Sub-pixel sampling for all paint tools for high-quality anti-aliasing
  • Full Alpha channel support
  • Layers and channels
  • A procedural database for calling internal GIMP functions from external programs, such as Script-Fu
  • Advanced scripting capabilities
  • Multiple undo/redo (limited only by disk space)
  • Transformation tools including rotate, scale, shear and flip
  • File formats supported include GIF, JPEG, PNG, XPM, TIFF, TGA, MPEG, PS, PDF, PCX, BMP and many others
  • Selection tools including rectangle, ellipse, free, fuzzy, bezier and intelligent
  • Plug-ins that allow for the easy addition of new file formats and new effect filters

Changes:
  • Core: Avoid D-Bus error message when built without D-Bus support
  • Core: Saving to existing .xcf.bz and .xcf.gz files didn't truncate them and could lead to unnecessarily large files
  • Core: Text layer created by gimp-text-fontname doesn't respect border when resized
  • Core: Avoid seeking when saving XCF files to prevent corruption with file network shares
  • GUI: Improve drawing performance in single window mode, especially with pixmap themes
  • GUI: Flow on Paint Dynamics editor dialog: the 'y' axis is indicating 'Rate' instead 'Flow'
  • GUI: Vertical ruler shows artifacts if the status bar isn't showing
  • GUI: Tablet stylus misbehaves when crossing the edge of a dock in multi-window-mode
  • GUI: Improve the visibility of slider handles with dark themes
  • GUI: Make it harder to switch to renaming if selecting already selected items in resource lists
  • Plugins: Avoid creating wrong layer group structure when importing PSD files
  • Plugins: Prevent a crash in PDF plug-in if images or resolution are large
  • Plugins: Stop parsing invalid PCX files early and prevent a segmentation fault
  • Plugins: Prevent the Python console from closing by the Escape key
  • Plugins: When printing, the images are composed onto a white background to prevent printing a black box instead of a transparent image
  • Plugins: Fix color vision deficiency display filters to apply gamma correction directly
  • Updated translations.

>>> Available for Ubuntu 17.04 Zesty/17.10/16.10 Yakkety/16.04 Xenial/14.04 Trusty/Linux Mint 18/17/other Ubuntu derivatives
To install Gimp 2.8.22 stable release in Ubuntu/Linux Mint open Terminal (Press Ctrl+Alt+T) and copy the following commands in the Terminal:


Install Resynthesizer Plugin with following command (It is not from above PPA):

Gimp 2.9.x Development version


>>> Available for Ubuntu 17.04 Zesty/17.10/16.10 Yakkety/16.04 Xenial/14.04 Trusty/Linux Mint 18/17/other Ubuntu derivatives
To install Gimp 2.9.5 development (unstable) version in Ubuntu/Linux Mint open Terminal (Press Ctrl+Alt+T) and copy the following commands in the Terminal:


Install Resynthesizer Plugin with following command (It is not from above PPA):
That's it
Source: Gimp
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