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Install Rendera 1.7 on Ubuntu 15.04 Vivid Vervet, ubuntu 14.10 Utopic Unicorn, Ubuntu 14.04 Trusty Tahr (LTS), Pinguy OS 14.04, Elementary OS 0.3 Freya and Linux Mint 17.2 Rafaela, Linux Mint 17.1 Rebecca, Linux Mint 17 Qiana  via PPA

Rendera is an open-source painting program. It was primarily designed with photo restoration in mind, but is also useful as a general painting application.

The tools, shapes, blending modes, edge-wrapping, and cloning may all be combined to suit a particular need. Brushstrokes are rendered after being drawn, allowing for slower, non-realtime calculations to be applied without interfering with the mouse or tablet response.

Features:

• use any combination of paint, blending, clone, and wrap options
• crop tool
• interactive offset (for working on seamless tiles)
• GIMP palette support with editor
• high-quality color quantization
• basic image transforms
• lots of built-in filters
• advanced color restoration filters
• alpha-channel support
• grid (no snap yet...)
• PNG, JPEG, BMP, and TGA file formats 

Rendera 1.7 changes:

• Paint preview uses the current color now instead of the ugly pattern
• Implemented redo
• Quit dialog
• Soft edge is hidden when not applicable to the current painting mode

How to Install Rendera 1.7 on Ubuntu / Linux Mint / Elementary OS  via PPA

sudo add-apt-repository ppa:dhor/myway
sudo apt-get update
sudo apt-get install rendera