feat: fix brightness filter implementation for proper GCC compatibility #26
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Description
This pull request fixes the brightness filter implementation to work correctly with GCC and proper argument parsing. The previous implementation had flawed argument parsing logic that prevented the brightness filter from functioning properly.
Key fixes:
Corrected getopt() usage with proper while loop and optarg handling
Fixed filters string to include vignette support ("bgrsivB:")
Updated brightness value parsing to use standard optarg instead of manual argv parsing
Added missing vignette filter case in switch statement
Fixed loop counter to use actual parsed filter count
The brightness filter now works correctly with the usage format: ./filter -B 40 input.bmp output.bmp
Semver Changes
[ ] Patch (bug fix, no new features)
[x] Minor (new features, no breaking changes)
[ ] Major (breaking changes)
Issues
Closes #17
Checklist
[x] I have read the Contributing Guidelines.