search for: convertcolor

It appears that the chromatic adaptation feature of `grDevices::convertColor`is broken, and likely has been for many years.? While a little surprising, it is an obscure enough feature that there is some possibility this is actually broken, as opposed to user error on my part.? If it turns out to the latter, I apologize in advance for spamming this list. Consider: ??? rgb.in...

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...

`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]...

...near", "spline")) { if (bias <= 0) stop("'bias' must be positive") colors <- t(col2rgb(colors, alpha=T)/255) space <- match.arg(space) interpolate <- match.arg(interpolate) if (space == "Lab") { colors <- convertColor(colors, from = "sRGB", to = "Lab") } interpolate <- switch(interpolate, linear = stats::approxfun, spline = stats::splinefun) if ((nc <- nrow(colors)) == 1L) { colors <- colors[c(1L, 1L), ] nc <- 2L } x <- seq.int(0, 1, length.o...

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

...possible > Paul> changes to the core engine and add-on packages. > > Paul> One of the issues will be consolidating some of the double-ups (e.g., > Paul> hcl() in base and the counterpart in package 'colorspace'; I did not > Paul> even know about convertColor()!). > > Paul> Ideally, we would have only one copy of the conversions between the > Paul> various colorspaces (probably C code, then the various R-level front > Paul> ends can all just run off the same internal code). > > Paul> A lot of these convers...

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

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

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]]

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

Hi, How would you calculate the "mean colour" of several colours, for example c("#FF7C00","#00BF40","#FFFF00")? Yours, Atte Tenkanen

...object x, str(x) now gives a warning and subsequently still shows most parts of x, e.g., when slots are missing. * gamma(x) and lgamma(x) no longer warn when correctly returning Inf or underflowing to zero. This helps maximum likelihood and similar computations. * convertColor() is now vectorized, so a lot faster for converting many colours at once. The new argument vectorized to colorConverter() ensures that non-vectorized colour converters still work. (Thanks to Brodie Gaslam.) * download.file() and url() get new argument headers for custom...

...object x, str(x) now gives a warning and subsequently still shows most parts of x, e.g., when slots are missing. * gamma(x) and lgamma(x) no longer warn when correctly returning Inf or underflowing to zero. This helps maximum likelihood and similar computations. * convertColor() is now vectorized, so a lot faster for converting many colours at once. The new argument vectorized to colorConverter() ensures that non-vectorized colour converters still work. (Thanks to Brodie Gaslam.) * download.file() and url() get new argument headers for custom...

...object x, str(x) now gives a warning and subsequently still shows most parts of x, e.g., when slots are missing. * gamma(x) and lgamma(x) no longer warn when correctly returning Inf or underflowing to zero. This helps maximum likelihood and similar computations. * convertColor() is now vectorized, so a lot faster for converting many colours at once. The new argument vectorized to colorConverter() ensures that non-vectorized colour converters still work. (Thanks to Brodie Gaslam.) * download.file() and url() get new argument headers for custom...

...ose in package MASS. This avoids using the "lm" method for "glm" objects if MASS is not attached. confint() has a default method using asymptotic normality. o contr.SAS() has been moved from the 'nlme' package to the 'stats' package. o New function convertColors() maps between color spaces. colorRamp() uses it. o The cov() function in the non-Pearson cases now ranks data after removal of missing values, not before. The pairwise-complete method should now be consistent with cor.test. (Code contributed by Shigenobu Aoki.) o Added delayedAssign...

...ose in package MASS. This avoids using the "lm" method for "glm" objects if MASS is not attached. confint() has a default method using asymptotic normality. o contr.SAS() has been moved from the 'nlme' package to the 'stats' package. o New function convertColors() maps between color spaces. colorRamp() uses it. o The cov() function in the non-Pearson cases now ranks data after removal of missing values, not before. The pairwise-complete method should now be consistent with cor.test. (Code contributed by Shigenobu Aoki.) o Added delayedAssign...

I want to take the first row of each unique ID value from a data frame. For instance > ddTable <- data.frame(Id=c(1,1,2,2),name=c("Paul","Joe","Bob","Larry")) I want a dataset that is Id Name 1 Paul 2 Bob > unique(ddTable) Will give me all 4 rows, and > unique(ddTable$Id) Will give me c(1,2), but not accompanied by the name column.