Displaying 20 results from an estimated 100 matches similar to: "Possible bug with chromatic adaptation in grDevices::convertColor"
2013 Jun 12
2
grDevices::convertColor XYZ space is it really xyY?
grDevices::convertColor has arguments 'from' and 'to' which can take on value 'XYZ'. Can someone confirm that 'XYZ' is the same as the CIE chromaticity coordinates that are also sometimes refered to as 'xyY' in the literature? Or are these the CIE tristimulus values? It looks to me like the first case is true, but I would appreciate hearing from one of
2018 Oct 03
1
grDevices::convertColor and colorRamp(space='Lab') Performance Improvements
`grDevices::convertColor` performance can be improved by 30-300x with
small changes to the code. `colorRamp(space='Lab')` uses `convertColor`
so it too benefits from substantial performance gains.
`convertColor` vectorizes explicitly over the rows of the input color
matrix using `apply`. The level-1 patch [1] illustrates a possible
minimal set of changes to achieve this with just R
2013 Jul 24
1
Alpha channel in colorRamp() and colorRampPalette()
Hi all,
I had the need to create a colorbar considering the alpha channel of the colors, but colorRamp() and colorRampPalette() ignored the alpha argument in rgb(). So I performed some minor modifs. in their codes, as to support the interpolation using the alpha channel.
I guess that those simple modifications might be useful for other people, so perhaps it would be worth to add them to
2006 Mar 02
1
extracting RGB values from a colorspace class object
Greetings,
After pouring over the documentation for the 'colorspace' package, I have not
been able to figure out how the plot() method converts colorspace coordinates
to RGB values for display on the screen. I am convert between colorspaces
with the various as() methods... but cannot seem to find a way to extract RGB
(i.e. for displaying on a computer screen) triplets from color space
2007 Dec 06
1
[R] color palette from red to blue passing white (shifted from R-help)
Hi,
The move to sRGB is nice, is there any interest in adding an interface
to lcms, http://www.littlecms.com,
to allow gamut matching? I can think of a lot of instances where I would
like to render a
figure as it would appear on my printer. This is probably best done as a
separate package though,
at least at first.
Nicholas
Martin Maechler wrote:
>>>>>> "Paul" ==
2009 Mar 14
3
[OT] two question about color space.
Hi there,
I try to plot visible light spectrum (380nm~780nm) with color
corresponding to the specific wavelength. However, I don't find a
function that could do this.
Another question, it's possible to plot a color space chromaticity
diagram like this:
http://upload.wikimedia.org/wikipedia/commons/thumb/0/02/CIExy1931.svg/300px-CIExy1931.svg.png
Thanks in advance!
Jinsong
2020 Apr 30
4
problem with `viridis` on Ubuntu 20.04
Il 30/04/20 03:14, Dirk Eddelbuettel ha scritto:
>
> On 30 April 2020 at 03:05, Samuele Carcagno wrote:
> | Il 30/04/20 01:39, Dirk Eddelbuettel ha scritto:
> | > Keep. It. Simple. And. Concise.
> | >
> | > And reproducible.
> |
> | I've attached a script that triggers the bug on my system. It's just two
> | lines, one to load `viridisLite`, and one to
2008 Jun 06
4
color scale mapped to B/W
In an R graphic, I'm using
cond.col <- c("green", "yellow", "red")
to represent a quantitative variable, where green means 'OK', yellow
represents 'warning'
and red represents 'danger'. Using these particular color names, in B/W,
red is darkest
and yellow is lightest. I'd like to find color designations to replace
yellow and
2006 Mar 20
1
RColorBrewer
Dear Erich and John, thankyou for providing RColorBrewer!
Are you working on options for CMYK or RGB return values?
Thanks again, Darren
[[alternative HTML version deleted]]
2019 Apr 26
0
R 3.6.0 is released
The build system rolled up R-3.6.0.tar.gz (codename "Planting of a Tree") this morning.
The list below details the changes in this release.
You can get the source code from
http://cran.r-project.org/src/base/R-3/R-3.6.0.tar.gz
or wait for it to be mirrored at a CRAN site nearer to you.
Binaries for various platforms will appear in due course.
For the R Core Team,
Peter Dalgaard
2019 Apr 26
0
R 3.6.0 is released
The build system rolled up R-3.6.0.tar.gz (codename "Planting of a Tree") this morning.
The list below details the changes in this release.
You can get the source code from
http://cran.r-project.org/src/base/R-3/R-3.6.0.tar.gz
or wait for it to be mirrored at a CRAN site nearer to you.
Binaries for various platforms will appear in due course.
For the R Core Team,
Peter Dalgaard
2019 Apr 26
0
R 3.6.0 is released
The build system rolled up R-3.6.0.tar.gz (codename "Planting of a Tree") this morning.
The list below details the changes in this release.
You can get the source code from
http://cran.r-project.org/src/base/R-3/R-3.6.0.tar.gz
or wait for it to be mirrored at a CRAN site nearer to you.
Binaries for various platforms will appear in due course.
For the R Core Team,
Peter Dalgaard
2016 Apr 16
0
Mean of hexadecimal numbers
On 16/04/2016 8:47 AM, Atte Tenkanen wrote:
> Hi,
>
> How would you calculate the "mean colour" of several colours, for
> example c("#FF7C00","#00BF40","#FFFF00")?
>
Bert answered your subject line question. Your text is asking something
else: if those are colours, you don't want to treat each of them as a
single integer.
A
2016 Apr 16
5
Mean of hexadecimal numbers
Hi,
How would you calculate the "mean colour" of several colours, for
example c("#FF7C00","#00BF40","#FFFF00")?
Yours,
Atte Tenkanen
2013 Mar 18
4
plotting CIE chromaticity diagram?
Has anyone plotted or is it possible to plot
CIE *xy* chromaticity diagram
http://en.wikipedia.org/wiki/File:CIE1931xy_blank.svg
I need this plot in color.
ishida
[[alternative HTML version deleted]]
2007 May 21
3
Selecting complementary colours
Dear r-helpers,
I wonder whether, given the "#rrggbb" representation of a colour, there is a
simple way to select the complementary colour, also expressed as a "#rrggbb"
string.
Any suggestions would be appreciated.
John
--------------------------------
John Fox, Professor
Department of Sociology
McMaster University
Hamilton, Ontario
Canada L8S 4M4
905-525-9140x23604
2006 Dec 11
2
FW: R
Hi Ricky / AJ
Progress of sorts. I got passed the last problem by looking at the makefiles
but run in to the next one, see below.
It has created files in /contrib/R-2.4.0. there is an " R " under
/contrib/R-2.4.0/bin/R.
Running it gives :-
/contrib/R-2.4.0/bin/R
R version 2.4.0 (2006-10-03)
Copyright (C) 2006 The R Foundation for Statistical Computing
ISBN 3-900051-07-0
R is
2011 Oct 17
2
how to use 'which' inside of 'apply'?
Hello R-community,
I am trying to populate a column (doy) in a large dataset with the first
column number that exceeds the value in another column (thold) using the
'apply' function.
Sample data:
pt D1 D17 D33 D49 D65 D81 D97 D113 D129 D145 D161 D177
D193 D209 D225 D241 D257
1 39177 0 0 0 0 0 0 0 0 0.4336 0.4754 0.5340667 0.5927334
0.6514 0.6966
2006 Mar 18
2
How to divide too long labels?
Is there any possibility to divide too long text in a plot to two or more
lines, when using labels-parameter in the text()-command?
Here is an example picture:
http://users.utu.fi/attenka/253.jpeg
My example script is something like this:
text(1,0.7,labels=Chordnames[fnid(pcs%%12)]) # according to Larry
Solomon's table http://solomonsmusic.net/pcsets.htm
Chordnames is a long vector with
2011 Jun 09
1
Error: missing values where TRUE/FALSE needed
I'm writing a function and keep getting the following error message.
myfunc <- function(lst) {
lst <- list(roots = c("car insurance", "auto insurance"),
roots2 = c("insurance"), prefix = c("cheap", "budget"),
prefix2 = c("low cost"), suffix = c("quote", "quotes"),
suffix2 = c("rate",