ImgConvert

Although most users prefer a graphical interface for performing all types of operations on the computer, there are some who would rather go for the command-line approach, since tasks can be quickly carried out by just entering a couple of lines of code.

If you fall in the second category and are looking for a image conversion and resizing solution, you can take a look at ImgConvert. It can convert graphic files into JPG, PNG, BMP, GIF, DDS, JNG, MNG, PGM, PPM, PFM, PSD, TGA, and XPM.

When it comes to PNG and JPEG images, you can change the PNG compression level and JPEG quality. It's also possible to create progressive JEPG files, ask the tool to accept symbolic links to files and directories when searching for files, as well as to generate a log file with the program's activity to learn which files were unsuccessfully processed, for example.

As far as photo resizing is concerned, you can resize the images by pixels or percentage, pick the preferred filter (Nearest, Bilinear, Bicubic, Lanczos), and set the output format to Gray8, Gray8A, Gray16, Gray16A, Index8, RGB24, RGBA32, RGB48 or RGBA64, depending on your preference.

You can reduce the number of colors and make adjustments when it comes to brightness, contrast, gamma, RGB and alpha (transparency). Grayscale images can be created from colored versions. Also, the pictures can be flipped or rotated by any angle.

Conversion and resizing tasks were swiftly carried out by the app during our tests while ImgConvert remained light on system resources consumption. It doesn't require installation, so you can keep it saved in your collection of portable software as well as save it to a USB flash drive to easily move it between all your workstations and fire it up whenever you need to quickly make picture adjustments.