D Image Editor

D Image Editor is a free and very convenient tool for editing an image by annotating it with freehand drawing paths, text, and built-in shapes. It also allows you to crop and flip the image.
- D Image Editor support freehand drawing over images with customizable stroke thickness options.
- Annotate images with shapes (rectangle, arrow, and circle), text, and freehand drawings that can be dragged and dropped, and resized.
- D Image Editor provides an option to perform image transformations such as rotate and flip.
- D Image Editor provides an option to crop a particular region of an image as desired with the help of the built-in cropping tool.
- D Image Editor supports image zooming and panning.
- All of that is for free without paying anything or in app purchase.
So this Free & Open Source Image Editor is a cross-platform image editor available for Android and iOS and more operating systems. It is free software, so whether you are a graphic designer, photographer, illustrator, or scientist. You will have a sophisticated tools to get your job done. You can further enhance your productivity with it thanks to many customization options.
You have the tools you needed for high quality image manipulation. From retouching to restoring to creative composites, the only limit is your imagination.
You have the power and flexibility to transform images into truly unique creations. So it is a freely distributed program for such tasks as photo retouching, image composition and image authoring. 
D Image Editor is a versatile graphics manipulation package. This page should help you get a taste of what is capable of.
Each task requires a different environment and D Image Editor allows you to customize the view and behavior the way you like it. Starting from the widget theme, allowing you to change colors, widget spacings and icon sizes to custom tool sets in the toolbox. The interface is modulized into so called docks, allowing you to stack them into tabs or keep them open in their own window. Pressing the tab key will toggle them hidden.
Numerous digital photo imperfections can be easily compensated for using D Image Editor. Fix perspective distortion caused by lens tilt simply choosing the corrective mode in the transform tools. Eliminate lens’ barrel distortion and vignetting with a powerful filter but a simple interface.
The included channel mixer gives you the flexibility and power to get your B/W photography stand out the way you need.
D Image Editor is ideal for advanced photo retouching techniques. Get rid of unneeded details using the clone tool, or touch up minor details easily with the new healing tool. With the perspective clone tool, it’s not difficult to clone objects with perspective in mind just as easily as with the orthogonal clone.