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The GIMP is designed to provide an intuitive graphical interface to a variety of image editing operations. Here is a list of the GIMP's major features: Image editing ------------- * Selection tools including rectangle, ellipse, free, fuzzy, bezier and intelligent. * Transformation tools including rotate, scale, shear and flip. * Painting tools including bucket, brush, airbrush, clone, convolve, blend and text. * Effects filters (such as blur, edge detect). * Channel & color operations (such as add, composite, decompose). * Plug-ins which allow for the easy addition of new file formats and new effect filters. * Multiple undo/redo.

libdmtx - software for reading and writing Data Matrix barcodes libdmtx is open source software for reading and writing Data Matrix barcodes on Linux, Unix, OS X, Windows, and certain mobile devices. At its core libdmtx is a shared library, allowing C/C++ programs to use its capabilities without restrictions or overhead. Data Matrix barcodes are two-dimensional symbols that hold a dense pattern of data with built-in error correction. The Data Matrix symbology (sometimes casually referred to as "DataMatrix") was invented and released into the public domain by RVSI Acuity CiMatrix.

LibRaw is a library for reading RAW files obtained from digital photo cameras (CRW/CR2, NEF, RAF, DNG, and others). LibRaw is based on the source codes of the dcraw utility, where part of drawbacks have already been eliminated and part will be fixed in future. The users of the library are provided with API to be built into their software programs. LibRaw is intended to be used in any software that involves RAW file processing for a variety of purposes: RAW converters, data analyzers, panorama stitchers, noise suppressors, etc.

VIPS's a free image processing system. It aims to be about half way between Excel and Photoshop. It's obviously much smaller than these two, but it's not a toy either (about 200k lines of code). It's very bad at photo retouching, but it's great (much better than programs like Photoshop, I think) at all the other things you use photoshop for. It's particularly good with large images (ie. images larger than the amount of RAM in your machine), and for working with colour.

Xournal is an application for notetaking, sketching, keeping a journal using a stylus. It is similar to Microsoft Windows Journal or to other alternatives such as Jarnal, Gournal, and NoteLab. Xournal aims to provide superior graphical quality (subpixel resolution) and overall functionality; however it lacks the collaborative features of Jarnal. Since Xournal is still in its early development stages, it may not be fully stable, and some features have not been implemented yet. Xournal supports annotation of PDF files through the Poppler library; PDF files, much like paper styles, are loaded as an immutable background image.

Luminance HDR is an open source graphical user interface application that aims to provide a complete workflow for HDR image processing. Supported features: * Create an HDR file from a set of images (formats: JPEG, TIFF 8-bit and 16-bit, RAW) of the same scene taken at different exposure settings * Rotate, resize, and crop HDR images * Tonemap HDR images * Copy EXIF data between sets of images Supported HDR formats (with file extensions): * OpenEXR (.exr) * Radiance RGBE (.hdr) * TIFF formats: 16-bit, 32-bit (float) and LogLuv (.tiff) * PFS native format (.pfs) * Raw image formats (various) Supported LDR formats: JPEG, PNG, PPM, PBM, TIFF (8-bit).

Luminance HDR is an open source graphical user interface application that aims to provide a complete workflow for HDR image processing. Supported features: * Create an HDR file from a set of images (formats: JPEG, TIFF 8-bit and 16-bit, RAW) of the same scene taken at different exposure settings * Rotate, resize, and crop HDR images * Tonemap HDR images * Copy EXIF data between sets of images Supported HDR formats (with file extensions): * OpenEXR (.exr) * Radiance RGBE (.hdr) * TIFF formats: 16-bit, 32-bit (float) and LogLuv (.tiff) * PFS native format (.pfs) * Raw image formats (various) Supported LDR formats: JPEG, PNG, PPM, PBM, TIFF (8-bit).

Libpng 是一个 PNG 规范的伴侣，为需要支持 PNG 文件格式的应用程序节省大量的时间。 大多数用户不需要大量修改程序库；高级用户可能需要做稍多的修改。这个程序库也是为 用户而编写的。在使代码易于理解的同时也在尽可能地使代码完善。目前，这个程序库支 持 C。其他语言的支持也在考虑当中。 http://libpng.sourceforge.net/

LablGL is an OpenGL interface for Objective Caml. Since it includes support for the Togl widget, you can comfortably use it with LablTk. All of the GL and GLU libraries are available. Read a good book about how to use these. Translating from OpenGL to LablGL is rather straightforward: there is a LablGL function for each OpenGL one. For ease of retrieving, both GL and GLU are cut in smaller modules of related functions. Please see ${PREFIX}/share/doc/ocaml/lablgl/README for further information.

gd is a graphics library. It allows your code to quickly draw images complete with lines, arcs, text, multiple colors, cut and paste from other images, and flood fills, and write out the result as a PNG, GIF or JPEG file. This is particularly useful in World Wide Web applications, where PNG, GIF and JPEG are three of the formats accepted for inline images by most browsers. gd does not provide for every possible desirable graphics operation, but version 2.0 does include most frequently requested features, including both truecolor and palette images, resampling (smooth resizing of truecolor images) and so forth.