STG Picture Merge
STG Picture Merge is a very small software that can overlap two pictures. The user interface of the program consists of s standard window in which you have a few options available.
Thus, you can open image files of various formats, including TIF, GIF, JPG, PNG and TGA, by using the file browser (batch processing is not possible).
In the main interface you can preview the three images ("Base", "Overlay" and "Merged"), check out their resolutions, as well as set the transparency level by using a simple slider.
Once you are satisfied with the modifications, you can save the output in the destination and format of your choice. In other words, STG Picture Merge can also be used as a simple image converter (simply add the same image in the "Base" and "Overlay" and save the output in a different format).
STG Picture Merge uses a moderate amount of system resources and completes a task in a very short amount of time. We haven't come across any problems from this point of view.
However, the application froze once, while we were using the file browser, and we had to restart STG Picture Merge. Furthermore, STG Picture Merge supposedly allows you to work with several video formats as well, but this didn't work at all in our case (the app either crashed or didn't open anything after double-clicking a video file).
The fact of the matter is that STG Picture Merge is a simple tool for merging two image files, that doesn't offer any configurable advanced settings. Once it fixes its "freezing" problems, we will happily recommend it to all users.