Image Stacker

Image Stacker is an advanced software utility that enables you to create synthesized long-exposures by combining multiple images. It supports multiple blending options and files with only the .jpg or .tif format.

Hassle-free installation and clear-cut interface

After a brief and uneventful setup procedure, you are greeted by a user-friendly interface, represented by a common window with a plain and simple structure, where you can add as many photo files as you want to the task.

Select the blending method and apply a dark frame picture

You can blend the images by stack (add all photos), average (average all photos), brighten (use brightest pixel), darken (use darkest pixel), or by a stack/average mix (set the divisor).
What's more, you can apply a dark frame image in the attempt to reduce image noise and adjust its opacity level, specify the gamma curve (sRGB or custom), set the lowpass and highpass threshold filters, tweak the JPG quality, and ask the tool to automatically suggest an output name as soon as the input files are added. Alternatively, you can modify the output file name.
The new file can be saved to any location you indicate on the disk, with .jpeg, .tiff or .bmp format. There are no other notable options provided by this piece of software.

Evaluation and conclusion

Picture merging jobs were carried out rapidly in our tests, during which the program remained low on system resources consumption. It had a good response time and low impact on the overall performance of the machine, running on low CPU and RAM. On the other hand, it hasn't been updated for a long time, and we would have liked to see richer support for file types. Nevertheless, you can test Image Stacker for yourself.