<p><a href="https://github.com/vfaronov" class="user-mention">@vfaronov</a> the <code>utils_scale_round</code> was probably changed because the first equation does not handle out of range values.</p>
<p>The problem is the use of binary floating point fractions to represent whole numbers with differing resolutions (a GdkColor has 16 bits per component, <code>#RRGGBB</code> has only 8), you get rounding errors, even using double.</p>

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