CombineZM: A Free Power Tool for Macro Photography Focus Stacking
In the world of macro photography, achieving a deep depth of field is a common challenge. While stopping down the aperture helps, it often leads to diffraction, reducing image sharpness. CombineZM is a free, open-source Windows software developed by Alan Hadley designed to solve this exact problem, enabling photographers to create images with an extended depth of field, or “infinite” focus.
This article explores what CombineZM is, how it works, and its role in the photography community. What is CombineZM?
CombineZM (short for CombineZ-Movie) is a legacy digital image processing software that specializes in focus stacking. It is the predecessor to CombineZP (CombineZ-Pyramid) and is built on the foundation of the older CombineZ5 software. It was specifically created to blend the in-focus areas of multiple partially focused digital photographs, usually close-ups, into a single, completely sharp composition. How CombineZM Works: Focus Stacking
The primary goal of CombineZM is to overcome the limitations of optics in macro or landscape photography. The process, known as focus stacking, involves several steps:
Capture: A photographer takes a sequence (or stack) of images, adjusting the focus slightly between each shot.
Align: CombineZM aligns these images to correct for any minute movements or magnification changes between shots.
Blend/Fuse: The software analyzes each frame, identifies the sharpest pixels, and combines them into one final image that is in focus from front to back. Key Features
Free and Open-Source: As a GPL-licensed tool, it has provided professional-level stacking capabilities at no cost.
Movie Making: Beyond still images, CombineZM can take a stack of images and create a “focus ripple” movie, showcasing how the focus shifts through the scene.
Multiple Algorithms: It includes several stacking algorithms that allow users to choose the best method for their specific subject. CombineZM vs. Modern Alternatives
While CombineZM is highly effective, it has largely been succeeded by CombineZP, which offers improved algorithms and faster processing. Many users have also moved toward newer, faster paid alternatives like Helicon Focus or Zerene Stacker.
However, in the mid-2000s, CombineZM was a revolutionary tool for photographers and researchers, particularly in entomology, to create crisp, detailed images of insects or specimens. Conclusion
CombineZM set the standard for accessible focus stacking software. Its ability to create professional-quality, extended-depth-of-field images, along with its capability to create movies, makes it a notable piece of software in the history of digital photography processing.
If you’d like, I can provide a step-by-step tutorial on using CombineZM (or its successor, CombineZP) to stack your first set of macro photos. Would that be helpful? Combine Photos for Infinite Depth of Field – Macworld