PhotoDemon is a portable and relatively small – less than 17MB unzipped – image editor which happens to be open source too. Most, if not all, features expected when working with images are present here. Plus there is also a Batch process mode available via the File menu (or Ctrl+B). A film strip area shows all open images.
PhotoDemon can import directly from the clipboard, cameras and scanners and also from URLs. Mouse and keyboard shortcuts for zoom make it easy to view details. The Image menu features most of what is expected like Resize, Crop, Rotate, and Flip plus a few others like Count unique colours and Transparency. The latter is a bit different because it can make specific colours transparent and leave other parts of an image untouched.
The selection has some interesting extras. When making a selection various effects can be added to the selection instead of the whole image. For example the screenshot above, probably not the best image to illustrate this, shows a rectangular selection with a border (After making a selection click Select –>Border). The Adjustment options are Black and white, Brightness and contrast, Color Balance, Levels, Vibrance, White balance, Channel, Color, Histogram, Invert, Lighting and Monochrome. The Effects are also most of the typical ones expected like Artistic, Blur, Distort, Edge, Experimental, Natural, Noise, Sharpen and Stylize. There is also a Custom filter window which is a fun to play with if not necessarily needed for most. The Experimental and Natural filters include the likes of Underwater, Rainbow, Alien and Radioactive.
The Tools menu is where macros can be recorded and plugins added, the included plugins are Exiftool, pngnq-s9, EZTwain, zlib and FreeImage. PhottoDemon offers a good solution for image editing beyond what is mentioned above and probably belongs high on the list of downloads to keep.