Alpha setting for color not used

[januz]

Describe the bug

Huxtable does not use alpha setting a given color in HTML output.

Minimal Reproducible Example

---
title: "Transparent color test"
output: html_document
---

color <- rgb(255/255, 182/255, 0/255, 1)
color_transparent <- rgb(255/255, 182/255, 0/255, 0.3)

huxtable::hux(a = 1:5, b = 1:5) %>% 
  huxtable::set_background_color(
    1, huxtable::everywhere, color
  )

huxtable::hux(a = 1:5, b = 1:5) %>% 
  huxtable::set_background_color(
    1, huxtable::everywhere, color_transparent
  )

Expected behavior

The color should be transparent in the second table.

System details

Huxtable: 4.7.1.9000
R: 3.6.0
RStudio: 1.2.1163

[hughjonesd]

Interesting. Supporting this in HTML would be not too hard. In LaTeX it would be a pain, judging by https://tex.stackexchange.com/questions/45596/how-to-specify-transparent-colors . I think this is a reasonable feature request; what's the use case?

[januz]

Thank you for looking into this! My main use case would be to use a color that isn't "too intense" as the background color for column headers (and aggregating bottom rows). Personally, I am mostly interested in a HTML solution, but maybe the transparent LaTeX package would work? Or maybe this workaround (mixing the color with white)?

[hughjonesd]

I think I'd say, choose the colour you want, if you don't actually need transparency. (Try the "shades" package for easy colour mixing.) From a quick look, supporting transparency in LaTeX looks very brutal and the code complexity might not be worth it... and then we haven't talked about rtf, docx etc... I will leave this open as an enhancement and see if it gets any upvotes.

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