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FreeImage is a library project for developers who would like to support popular graphics image formats (PNG, JPEG, TIFF, BMP and others). Some highlights are: extremely simple in use, not limited to the local PC (unique FreeImageIO) and Plugin driven!
JDrafting is an open source Java application to create Technical Drawing exercises.
This application is inspired by the 'Classical Construction', also known as 'Ruler-and-compass Construction' or 'Compass-and-straightedge construction'. However, another drawing tools can be used.
(More info about classical construction: https://en.wikipedia.org/w/index.php?title=Compass-and-straightedge_construction)
Download examples in 'Files tab'
JRE 8+...
GEDI (Groundtruthing Environment for Document Images) is a highly configurable document image annotation tool. Its basic structure involves two types of files, an Image file, and a corresponding .XML file in GEDI format. LAMP Univ of MD, College Park, MD
This project is now hosted at https://github.com/yomboprime/colorator
Colorator is a Java image editor for PC, to make images in hi resolution color for the original Sinclair ZX Spectrum 8-bit computers. Colorator can also edit normal SCR Spectrum images. It can export to TAP to view in your real ZX Spectrum or emulator.
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SpiroJ is a simple generator of hypotrochoids and similar roulettes. The basic principle is rolling one circle on another circle - similar to the classic Spirograph toy, but more flexible. It can export drawing to SVG, EPS and AI formats.
ImajEditor is a Java based open source image editing software capable of doing all the basic image editing functions like Grayscale,Negetive, brightness,Sharpening,Embossing,Change colour,Edge detection,rotation,Mean Filter,Median Filter etc.
jumbles (Java Unified Metadata Basic Library for Extracting and Storing) is a library that enables the extraction and storing of multimedia metadata. Currently wraps "jaudiotagger" (MP3 ID3 tags) and "metadata extractor" (EXIF, et al.).
JThumbnailer is a Image Preview program which contains basic preview function, such as File System Browsing, Thumbnail view, actual size view of Image, resize, rotate, flip, Html generation.