ConvertImg

Anything a set of features can accomplish through a graphical interface most of the times can also be accomplished through a command line interface as well. This can range from complex technical operations, to simple conversion tasks, and ConvertImg comes with the right means to process different types of pictures.
No installation is required to make the application work, and can even be used directly from a thumb drive, or carried around. Note that it needs to be launched from the Command Prompt, and a fast way to do this is to open up an instance by holding down the Shift key and right clicking inside the source folder.
The application can process multiple pictures at a time, and it’s best to place them in a single folder for easy access. All of them are delivered to a specific destination, under one of the formats like BMP, OS2, PCX, TGA, RLE, GIF, JPG, TIFF, and PNG.
It also bundles up several switches with the help of which to recursively explore source path or create destination, automatic color depth management, JPG compression, or drawing mode for dithering.
Additionally, pictures can be enhanced on the spot through effects like flip, negative, color channel manipulation, saturation, rotation, hue, brighten, gamma, matrix, or focus, each with different parameters for fine tuning effects.