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# Histogram computation
Histogram computation capabilities in GIL are demonstrated by the program `tutorial_histogram`, compiled from the sources `example/tutorial_histogram.cpp`.
## Synopsis
`tutorial_histogram`
The program expects to find an image in the JPEG format in the current directory named `input.jpg`, and produces a text file named `out-histogram.txt`, in the current direction, where the histogram has been calculated..
The program doesn't take any command line arguments.
## Specific requirements
### Build requirements
- A C++ compiler compliant with C++14 or above
- The JPEG library installed and configured.
### Execution requirements
`tutorial_histogram` expects to find an image in the JPEG format in the current directory.
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