feat: add support for hexadecimal RGBA color format #2004
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This commit adds support for 4-digit and 8-digit hexadecimal color codes with alpha channel (e.g., #FF00FF80 for 50% transparent magenta). Changes: - Extended Color dataclass with optional alpha field (default 255) - Updated _validate_color_hex to accept lengths 3, 4, 6, 8 - Updated from_hex to parse 4-digit (#RGBA) and 8-digit (#RRGGBBAA) hex codes - Modified as_hex to return #RRGGBBAA when alpha != 255 - Added as_rgba() and as_bgra() methods - Added from_rgba_tuple() and from_bgra_tuple() class methods - Updated __eq__ and __hash__ to include alpha channel - Added comprehensive unit tests for all RGBA functionality - Updated docstrings with examples of new alpha channel support Resolves roboflow#1849
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Summary
Adds support for 4-digit and 8-digit hexadecimal color codes with alpha channel to the
Colorclass, addressing issue #1849.Users can now use colors like:
#FF00FF80(50% transparent magenta)#f0f8(shorthand 4-digit RGBA)Changes Made
Core Functionality
Colordataclass with optionalafield (alpha channel, default 255)_validate_color_hex()to accept lengths 3, 4, 6, and 8from_hex()to parse 4-digit (#RGBA) and 8-digit (#RRGGBBAA) hex codesas_hex()to return #RRGGBBAA format when alpha != 255, otherwise #RRGGBBNew Methods
as_rgba()- returns RGBA tupleas_bgra()- returns BGRA tuplefrom_rgba_tuple()- creates Color from RGBA tuplefrom_bgra_tuple()- creates Color from BGRA tupleInternal Updates
__eq__()and__hash__()to include alpha channelTesting
Backward Compatibility
✅ Fully backward compatible - all existing code continues to work:
as_hex()returns 6-digit format when alpha=255Resolves
Closes #1849