Geographic Information Systems Asked by necrohiero on January 23, 2021
Using QGIS 3.16, I am trying to set color through expression builder, using #RRGGBBAA
format.
The problem, I was using the same color, let’s say '#94AFDCff'
, it should return the same color as '#94AFDC'
in #RRGGBB
format, yet the color that is rendered is fully different. I cannot seem to find out why.
Could anyone help?
The code is simple, it is used in symbol, as a condition of fill colors of circles.
CASE
WHEN "Cat_Num" = 1 THEN '#94AFDC66'
WHEN "Cat_Num" = 2 THEN '#FFFF0066'
WHEN "Cat_Num" = 3 THEN '#ffc40366'
WHEN "Cat_Num" = 4 THEN '#54823566'
WHEN "Cat_Num" = 5 THEN '#7030a066'
WHEN "Cat_Num" = 6 THEN '#843c0c66'
WHEN "Cat_Num" = 7 THEN '#38c0f666'
WHEN "Cat_Num" = 8 THEN '#CCCC0066'
WHEN "Cat_Num" = 9 THEN '#C55A1166'
WHEN "Cat_Num" = 10 THEN '#8d5a9966'
ELSE 'pink'
END
but this code resulted in (notice that the 2 circles are "Cat_Num" = 8 THEN '#CCCC0066'
and "Cat_Num" = 10 THEN '#8d5a9966'
)
In the end, I did change the code to rgba format, so that "Cat_Num" = 8 THEN '204, 204, 0, 90'
and "Cat_Num" = 10 THEN '141, 90, 153, 90'
with this result:
How are these 2 so different?? The hex color returns pink result for "Cat_Num" = 8 THEN '#CCCC0066'
(the bigger circle). The smaller circle, which should return purplish, became greenish… Did I make a mistake?
As a reference, in QGIS’ own color picker, inputting '#CCCC0066'
will have the same color as '141, 90, 153, 90'
, only different transparency value (90 is about 0.65% for RRGGBBAA
and 66 in hex is 40% )
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