How to increase opacity of a text shadow?

[skribb]

Hi, i have created a text using

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convert -size 500x250 canvas:none -font Roboto-Regular -pointsize 160 -draw "text 90,230 '12.34'" -channel RGBA -blur 0x30 -fill white -draw "text 90,230 '12.34'" clock.png

which renders:


Now, i am happy with the result apart from one thing, and it's the opacity of the shadow. How do i make the shadow less translucent?
The blur amount is correct so it's not a matter of decreasing the blur (which of course will increase the opacity but transform the shadow into a normal text contour).

thanks

[snibgo]

After blurring, before writing the white text, you can insert something like:

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-channel A -evaluate Multiply 2 +channel

Multiplying by >1 will make it more opaque, <1 will make it more transparent. Or you can use a gamma function, or other magick.

[skribb]

That's some ockult magick right there! Works perfect, thanks