Caesium Image Compressor lets you compress your pictures up to 90% without visible quality loss. Providing a simple yet effective interface with a real-time preview and multiple image processing at the same time, everyone will be able to reach the best result. Advanced users will find extra features, like metadata storing options or folder structure support.
Converseen is a free cross-platform batch image processor for Windows and Linux that allows you to convert, resize, rotate and flip an infinite number of images with a mouse click.
Enblend combines images that overlap into a single large image with no seams. Enfuse combines images that overlap into a single image with good exposure and good focus.
Fotoxx is a free open source Linux program for editing digital photos. The goal of fotoxx is to meet most photo editing needs while remaining easy to use. It can navigate images using a pageable thumbnail window. Change brightness and contrast, change color intensity, saturation, depth, make panoramas and HDR images, fix red-eyes, trim, rescale, rotate any angle, warp, fix perspective, sharpen, blur, remove noise. Edit within mouse-selected area. Import RAW files, edit 16 bits/color. Add tags to images, search by tags, dates, rating.
ImageJ is a public domain, Java-based image processing program developed at the National Institutes of Health. ImageJ was designed with an open architecture that provides extensibility via Java plugins and recordable macros. Custom acquisition, analysis and processing plugins can be developed using ImageJ's built-in editor and a Java compiler. User-written plugins make it possible to solve many image processing and analysis problems.
GIMP is a free program for such photo retouching, image composition and image authoring. Essentially it's the closest thing to Photoshop you can get for free.
G'MIC is a full-featured open-source framework for image processing, distributed under the CeCILL free software licenses (LGPL-like and/or GPL-compatible). It provides several different user interfaces to convert / manipulate / filter / visualize generic image datasets, ranging from 1d scalar signals to 3d+t sequences of multi-spectral volumetric images, hence including 2d color images.
GraphicsMagick is the swiss army knife of image processing. Comprised of 282K physical lines (according to David A. Wheelers SLOCCount) of source code in the base package (or 952K including 3rd party libraries) it provides a robust and efficient collection of tools and libraries which support reading, writing, and manipulating an image in over 88 major formats including important formats like DPX, GIF, JPEG, JPEG-2000, PNG, PDF, PNM, and TIFF.
HDR raw exposure merging : HDRMerge combines two or more raw images into a single raw with an extended dynamic range.
Hugin is an easy to use cross-platform panoramic imaging toolchain based on Panorama Tools. With Hugin you can assemble a mosaic of photographs into a complete impressive panorama, stitch any series of overlapping pictures and much more.i
ImageMagick is a software suite to create, edit, and compose bitmap images. It can read, convert and write images in a variety of formats (about 100) including GIF, JPEG, JPEG-2000, PNG, PDF, PhotoCD, TIFF, and DPX. Use ImageMagick to translate, flip, mirror, rotate, scale, shear and transform images, adjust image colors, apply various special effects, or draw text, lines, polygons, ellipses and Bézier curves. ImageMagick is free software delivered as a ready-to-run binary distribution or as source code that you can freely use, copy, modify, and distribute. Its license is compatible with the GPL. It runs on all major operating systems. The functionality of ImageMagick is typically utilized from the command line or you can use the features from programs written in your favorite programming language. Choose from these interfaces: MagickCore (C), MagickWand (C), ChMagick (Ch), Magick++ (C++), JMagick (Java), L-Magick (Lisp), PascalMagick (Pascal), PerlMagick (Perl), MagickWand for PHP (PHP), PythonMagick (Python), RMagick (Ruby), or TclMagick (Tcl/TK). With a language interface, use ImageMagick to modify or create images automagically and dynamically.
KolourPaint is a simple painting program to quickly create raster images. It is useful as a touch-up tool and simple image editing tasks.
Krita is a complete creative sketching and painting application with advanced, commercial quality features. It's free, open-source and available across all major desktop platforms.
User Interface - An intuitive user interface that stays out of your way. The dockers and panels can be moved and customized for your specific workflow. Once you have your setup, you can save it as your own workspace. You can also create your own shortcuts for commonly used tools.
Pop-up Palette - Quickly pick your color and brush by right-clicking on the canvas.
Brush Stabilizers - Have a shaky hand? Add a stabilizer to your brush to smoothen it out.
Brush Engines - Customize your brushes with 9 unique brush engines.
Wrap-around mode - It is easy to create seamless textures and patterns now. Press the ‘W’ key while painting to toggle wrap-around mode.
Resource Manager - Import brush and texture packs from other artists to expand your tool set.
Layer Management - Krita comes with vector, filter, group, and file layers. Combine, order, and flatten layers to keep organized. Add drop shadows and other simple effects using visual styles.
Full Color Management - Krita supports full color management through LCMS for ICC and OpenColor IO for EXR, allowing you to incorporate Krita into your existing color management pipeline.
Luminance HDR is a graphical user interface (based on the Qt5 toolkit) that provides a complete workflow for HDR imaging.
Layers, filters, layer styles, adjustment layers, masks, selections, brushes, undo/redo, graphics tablet support, raw file import, etc. Interactive filter layers, full GPU acceleration, and full HDR support.
Pinta is a free, open source drawing/editing program modeled after Paint.NET . Its goal is to provide users with a simple yet powerful way to draw and manipulate images on Linux, Mac, and Windows.
On Windows, Pinta requires the .NET framework, just like Paint.NET.
Pixeluvo is a beautifully designed photo and image editor for PC. It supports everything from simple color and contrast tweaks, cropping and resizing, to complex photo montage with multiple layers, masks and effects.
Photoflare is a cross-platform image editor with an aim to balance between powerful features and a very friendly graphical user interface. It suits a wide variety of different tasks and users who value a more nimble workflow. Features include basic image editing capabilities, paint brushes, image filters, colour adjustments and more advanced features such as Batch image processing.
A fully non-destructive photo retouching program providing a complete layer-based workflow including RAW image development.
Online photo editor, which can work with PSD, XCF and Sketch files (Photoshop, Gimp and Sketch App). Convert between PSD, XCF, JPG, PNG and many other formats. .
From advanced image filters to professional local adjustments, Polarr Photo Editor is the most versatile and powerful online photo editor in the web.
Siril is an astronomical image processing tool, able to convert, pre-process images, help aligning them automatically or manually, stack them and enhance final images.
libvips is a demand-driven, horizontally threaded image processing library. Compared to similar libraries, libvips runs quickly and uses little memory. libvips is licensed under the LGPL 2.1+.
It has around 300 operations covering arithmetic, histograms, convolution, morphological operations, frequency filtering, colour, resampling, statistics and others. It supports a large range of numeric formats, from 8-bit int to 128-bit complex. Images can have any number of bands. It supports a good range of image formats, including JPEG, TIFF, PNG, WebP, FITS, Matlab, OpenEXR, PDF, SVG, HDR, PPM, CSV, GIF, Analyze, NIfTI, DeepZoom, and OpenSlide. It can also load images via ImageMagick or GraphicsMagick, letting it load formats like DICOM.
It comes with bindings for C, C++, and the command-line. Full bindings are available for Ruby, Python, PHP, .NET, Go, and Lua. libvips is used as an image processing engine by sharp (on node.js), bimg, sharp for Go, Ruby on Rails, carrierwave-vips, mediawiki, PhotoFlow and others. The official libvips GUI is nip2, a strange combination of a spreadsheet and an photo editor.
The download area has the source code plus pre-compiled binaries for Windows; you can install on macOS with homebrew, MacPorts or Fink; and it’s available in most Linux package managers. See the install notes.
XnConvert is an easy image converter for graphic files, photos and images available on Windows, MacOSX and Linux.
It supports more than 400 file formats (jpeg, tiff, png, gif, camera raw, jpeg2000, WebP, OpenEXR, ...).
You can resize, add a watermark, change contrast, brightness or gamma, apply filters and many other things.
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