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# Histogram
Histogram capabilities in GIL are demonstrated by the program `histogram`, compiled from the sources `example/histogram.cpp`.
## Synopsis
`histogram`
The program doesn't take any argument on the command line.
`histogram` expects to find an image called `test_adaptive.png` in the current directory.
The program doesn't produce any output.
## Specific requirements
### Build requirements
- A C++ compiler compliant with C++14 or above
- The PNG library installed and configured.
### Execution requirements
- `histogram` expects to find an image called `test_adaptive.png` in the current directory.
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