similar to: invalid colour name 'rgb(1.000,0,0)' error

A quick question: Is there anywhere a listing of the RGB components of the named colours listed by colors()? For example, where would I find the RGB for "orange1" or "salmon"? When I look at an EPS file from R where I have used these colours, it seems that for: "salmon": 0.9804 0.5020 0.4471 rgb "orange1": 1 0.6471 0 rgb However, this is a tedious way

Hi, I am working on table suing R and Latex. I am writing .Rnw file first in which i m reading input file and storing into dataframe. After filtering certain values from this dataframe. I am planning to display it. I don't want to use xtable since i need to change column names. *Sample .Rnw file* @ <<echo=FALSE>>= cat("\begin{table}[ht]")

There are a lot of ways to specify colours in R plot functions (number from the palette, by name, etc.). I'd like to pass a colour from an R function to an external function, and I'd like it to have the same flexibility. To avoid having to interpret all possible colour specifications myself, I need a function to convert a general colour specification into a standard form (e.g. r,g,b

Hi, I am working on barplot. I need to plot x-axis but scale on x axis is very upto 15 while my data is upto 19. pdf("image.pdf", width=10 , height =13) par(mar=c(5,22.5,2,2)) barplot(t(data[,2:3]), beside=TRUE, col=c(rgb(.537, .769, .933),rgb(.059, .412, .659)), width = 1, horiz=TRUE,cex.names=.9, border ="white",las=1, cex.axis= 1, cex.lab=1.2)

Based on reading 'rgb' documentation, I would have thought the following would have produced identical results. Can someone explain how to make this happen? I need to be able to specify an array of rgb values for the 'col' parameter. colnames.col <- c("black", "red", "blue", "green") colnames.rgb <- apply(as.matrix(colnames.col), 1,

Hi All, In function "rgb", alpha parameter is supposed to set the transparency value. But in my following two examples, it didn't work: plot(1,col = rgb(1,0,0,alpha =0.8)) # as long as alpha < 1, there is no point in the plot. plot(1,col = rgb(0,0,255, alpha=254, maxColorValue=255)) # as long as alpha < 255, there is no point in the plot. Do I use it in the right way? Any

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

I want to get a lighter shade of a color...I have a lot of colored objects and want each one printed as a foreground against a slightly lighter background. I thought I could try something like changing the alpha channel by first converting it to rgb. But prior to trying that, I'm stuck with how to get the color after converting using col2rgb() to be interpreted again as a color, rather than

Hi all, how can I convert a RGB (24 or 32) image I'm getting from a webcam for example to YUV to compress it with theora, decompress it and convert it back to RGB to draw it? Any suggestions? Best regards, Florian (Stuttgart, GERMANY)

Hi all, I'm trying to convert a series of rgb codes into a color name. What is my easiest option? So far I'm stuck with just converting to hex using rgb() and I know R knows a number of colours() but a mapping of the two has failed me. Any help in this regard will be highly appreciated. Regards, George

Hi all, I created three separate square matrices (lets say R, G, and B). each one contains a series of values between 0 and 1. I want to be able to take for example R[1], G[1], B[1] and create a rgb color value into a fourth matrix. I tried using the rgb function but I must be doing something wrong because it fails with the following error message. (list) object cannot be coerced to

Hi, I coded some routines for YCbCr <-> RGB conversion, both using floating point numbers and using integer arithmetics, code is attached. Let's say I want to convert from RGB to YCbCr and back. First the integer arithmetics: In [1]: from colors import * In [2]: a = [255, 0, 255] In [3]: RGB2YCbCr(a) Out[3]: (107, 202, 222) In [4]: YCbCr2RGB(RGB2YCbCr(a)) Out[4]: array([255, 1,

I've spent the weekend or so trying to get my head around Theora and I'm just not having any luck. First of all, I really don't have any interest in immersing myself in video encoding--I just have one simple thing I'd like to do--so I haven't spent any time reading about the theory or specs or anything like that. I'm attempting to write a "render-to-theora"

Hello all, I'd like to convert the theora yuv_buffer to RGB that I can render onto a texture. Googling around, there are a tone of different formulae to do so. There is this (with lots of corrections and amendments further down the page): http://www.fourcc.org/fccyvrgb.php <http://www.fourcc.org/fccyvrgb.php> and there is the MSDN stuff that says you need to convert 4:2:0 and

Hello, i'm sorry for my English is not good. I need help with convert yuv_buffer data (YCbCr) to RGB without SDL. I write: BYTE *frame=new BYTE[YUV_BUFFER.y_height*YUV_BUFFER.y_width*4]; for(int cc=0; cc<YUV_BUFFER.y_height*YUV_BUFFER.y_width; cc++) { frame[cc*4+0]=YUV_BUFFER.y[cc]+1.371*(YUV_BUFFER.v[cc]-128);

Hello list, When I convert an yuv pixel into rgb using the recipies in http://www.fourcc.org/fccyvrgb.php I get an accurate color conversion but the contrast seems to be decreased. If i write, e.g., the pixel directly into an sdl yuv_overlay, I get a well-contrasted frame, however, if I convert the pixel to rgb and call SDL_MapRGB, I get a contrast-decreased frame. Thanks, Ribamar

Hello all, I'm now using image() to show image data (in my case dumps of SOM weights) but would like to show RGB colour data, not just single "z" colour values. I've currently been using seq() to skip 4 values, so I can show the R, G or B channels separately as "z". But is there a way I can show all three channels simultaneously as a proper colour image? Thanks, B.

I've writen this function (imagenrgb) to display a (m,n,3) array as a RGB image with ngris^3 colors and,optionally, stretching. If option ver=F, it does not display but saves a pseudocolor version of the image as a list (so that subsequent displays are faster). I'd appreciate feedback and improvements and hope that it's useful for others. Example of use: > dim(imatest) [1] 100

HI, I need to parse an xml where key name are same but values are different. <root> <test> Some dummy text </test> <node id="1">one</node> <node id="2">two</node> <node id="3">three</node> </root> When i use xmlGetAttr() function i always get one as value. How

Hi, I m working on R and read one image with russian font using readjpeg() function and write it on pdf (using grid). But russian text is not visible on pdf. How can i fix my pblm? Regards <http://r.789695.n4.nabble.com/file/n4650417/pointer.jpg> library(JPEG) library(grid) pdf("out.pdf" , width = 6.6 ,height = 4.2,family= "URWHelvetica", encoding="KOI8-R")