How RGB Triplets Convert to HEX Codes and Where the Process Can Go Wrong

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Converting an RGB color value like rgb(255, 99, 71) to a HEX code such as #FF6347 is a straightforward base-10 to base-16 conversion performed separately on each of the three color channels. Because each channel fits exactly into two hexadecimal characters, the conversion itself is mathematically lossless with no rounding involved. However, problems can arise from out-of-gamut inputs, float-normalized values, or mismatched color spaces such as Display P3 versus sRGB. For example, copying a wide-gamut color picker value directly into a CSS stylesheet without conversion can produce visibly different colors than intended. Developers building color pipelines are advised to validate input ranges, choose a consistent rounding strategy for float inputs, and confirm the source color space before converting.

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