RawImageAnalyser

RawImageAnalyser is a comprehensive and reliable piece of software whose main purpose is to provide you with the proper tools to perform extensive image comparisons.
The program enables you to add two or more files, of various formats, either by drag and dropping them into the window or by loading them the old-fashioned way. RawImageAnalyser even supports running in command line, so you can use it in whichever mode you prefer, or which seems easier to you.
RawImageAnalyser displays the images side by side, emphasizing different pixels in a third panel, that is supposed to show the distinguishing markers between the two pictures. Despite the fact that it is designed for RAW files, it supports JPG, PNG and other popular formats.
The utility offers a minimal interface, so as to focus your attention on the images themselves rather than on toolbars, menus and buttons. RawImageAnalyser works via a set of hotkeys and a few mouse movements, their combinations can be discovered in the 'Help' section.
For instance, in order to zoom in or out, you can use the mouse scroll and your CTRL key, as well as the 'Plus' and ' Minus' buttons. The 'n' key will duplicate the current image or the 'Region of Interest' (ROI), while by pressing the letter 'R' you will activate the display of a ruler on the edges of the compared photos. Nonetheless, many others shortcuts are available.
The 'Histogram' features a statistical view of the compared pictures, using graphs to detail the relevant data for each color. This is mainly useful when working with 'ROIs' as it analyzes only the selected area.
RawImageAnalyser is a professional application, created for those who know how to handle such tools or who have the patience to sit through a lengthy 'Help' file in order to learn which are the program's functions, hotkeys and options.