ТЕХНИЧЕСКАЯ ПОДДЕРЖКА / БАГИ ВЕБ-ПРИЛОЖЕНИЙ

Not specific to ryzom, but it sounds like RGBA should be noted as 4 hex numbers,
so RGBa(0, 0, 0, 0.5) should corespond to 00000080

where all four values are 0-255 (h00-hFF), 0.5 being 128 = h80.