Message-ID: <875x93owat.fsf@enricoschumann.net>
Date: 2026-01-15T13:11:22Z
From: Enrico Schumann
Subject: Custom theme with quantmod library
In-Reply-To: <87fr87owpg.fsf@enricoschumann.net> (Enrico Schumann's message of "Thu, 15 Jan 2026 14:02:35 +0100")
On Thu, 15 Jan 2026, Enrico Schumann writes:
> On Wed, 14 Jan 2026, Andre Luiz Tietbohl Ramos writes:
>
>> Hello,
>>
>> Is there a way to customize quantmod theme colors? This great library
>> works fine however I rather change its color theme. So far, I have been
>> able to use both white and black themes.
>> I tried to use the chartSeries theme command described below to no avail.
>> I tried even without a theme name, e.g. white or black. An example is below,
>>
>> stock.plot <- chartSeries(stock.time_interval, ## ativo,
>> name = stock.name,
>> type = "candlestick",
>> subset='2025-07::2026-01',
>> theme = chartTheme("white", up.col='darkgreen',
>> dn.col='darkred',
>> bg.col='gray',
>> selection.color='gray'),
>> TA = NULL
>> )
>>
>> Could anyone help, please?
>>
>> TIA,
>>
>> --
>> Andre Luiz Tietbohl Ramos, PhD
>>
>
> With quantmod 0.4.28 and R 4.5.2, and ESS (but on GNU/Linux),
> I can change colours, e. g.
>
> library("quantmod")
> getSymbols("AAPL")
>
> chartSeries(
> AAPL,
> type = "candlestick",
> subset = '2025-07::2026-01',
> theme = chartTheme("black",
> up.col = "blue"))
>
> gives me "blue" up-bars. The same example also works
> when I run it from a terminal.
>
> Could this be some Apple-specific thing?
What happens when you send the graphic to a PDF, e.g.:
pdf("some-file-name.pdf")
library("quantmod")
getSymbols("AAPL")
chartSeries(
AAPL,
type = "candlestick",
subset = '2025-07::2026-01',
theme = chartTheme("black",
up.col = "blue"))
dev.off()
Does the colour show up?
--
Enrico Schumann
Lucerne, Switzerland
https://enricoschumann.net