search for: luminance

...i all, I'm trying to generate barplots from simple but long (~100000-row) data files, in which each bar will comprise two stacked 'sub-bars'. All the upper sub-bars will have the same hue, and all the lower bars will, likewise, have another uniform hue. However, I wish to specify the luminance (aka brightness) of each bar (i.e., each whole bar comprising two sub-bars) separately, and I wish the plot to render without spaces between successive bars. I've been trying to get this going in ggplot2. Two problems arise: first, I'm unable to eliminate the spaces between successive ba...

On Fri, 4 Jun 2004, Makc wrote: > Here's what you can find in the net on YUV scheme: Hmm? What prompted this? > The statement I care to make here, is simply that there ain't neither > such thing as "luminance", which details "the eye is more sensitive to", "ain't neither"? Double negative, so I take your statement to mean that there *is* such a thing as luminance...:) > nor "chromaticity", which details the eye is less sensitive to. What we > have here is s...

...o I set the h,c, and l values such that the significant, positive residuals appear different on a grayscale printer from significant grayscale residuals. The challenge as I see it is that one can only distinguish the positive and negative residuals with the hue/. Varying the chroma and the luminance only affect the distinctions between large and small and significant and non significant. But my positive and negative residuals are both large (absolutely) and significant, meaning that they will have the same chroma and luminosity, but different hues. I guess the key here is to find two...

Hi All, I'm trying trying to draw a colour wheel (a slice of hcl space) in R. Running the code below doesn't give me what I expect - there's some oddly bright colours of the wrong hue around c(0, 0) and I see three coloured circles (a small magenta, a medium sized yellow and a large cyan). Am I doing something wrong or is there a bug in the hcl code? (Also any suggestions for

...ly, rather than providing a numerical matrix and a 1D-colour scale (heatmap, image, levelplots,NeatMap...). I'm surprised I haven't found anything simple with RSiteSearch, help.search, net. I'd like to use this function to encode one variable as "chroma" and a second as "luminance" (hcl colour space), so that the two variables can be visualised in a single heatmap (the variable are fold-change and a q-value, a significance measure). If anyone has any thoughts/warnings to offer re this idea then I'd love to hear them (it must have been tried before, but I've not...

hi, having worked into the Storage SIG group to add/maintain ceph-ansible in the jewel repo and create the new repo for the ceph luminous release, I would like to update the wiki pages at [1] and [2] with some links and better instructions Username: GiulioFidente 1. https://wiki.centos.org/SpecialInterestGroup/Storage 2. https://wiki.centos.org/SpecialInterestGroup/Storage/Ceph -- Giulio

...I'm working on image classification and for that I want to use the spectral slope as a feature for my classifier. For this I would prefer to calculate this feature using R, so far I've read my image and converted it's RGB representation into HSL. The spectral slope is computed over the Luminance component, so at the moment what I have is a NxN matrix of Luminance values. The following steps would be: 1- Calculating the FFT of the Luminance matrix. 2- Calculating the Power Spectra, which is computed as |FFT|^2. 3- Matching every Power Spectra value to its Spatial frequency and doing a line...

I have seen a couple of posts about color schemes like those at the ColorBrewer site. Most recently: http://geography.uoregon.edu/datagraphics/color_scales.htm These color schemes can work very well for regions (bars, polygons, images, etc.) but are not very suitable for points and/or lines. Is anyone aware of research/suggestions for a color scheme to use for scatter plots? I've looked at

Hello, I want to make a program to extract frame from a theora movie as images. I tried with the decoding example located at theora web site (dump_video.c. I use it to extract a frame as yuv image but when I try to convert it to ppm with yuvtoppm program i obtain a strange image ( see http://poux.be/tmp/file.ppm ). I think it's a problem with the byte order for yuv, but don't I don't

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

On 09/28/2017 06:01 PM, Akemi Yagi wrote: > On Thu, Sep 28, 2017 at 7:17 AM, Giulio Fidente > <gfidente at fedoraproject.org <mailto:gfidente at fedoraproject.org>> wrote: > > hi, > > having worked into the Storage SIG group to add/maintain ceph-ansible in > the jewel repo and create the new repo for the ceph luminous release, I > would like to

Dear R-helpers, This produces a red title. How do I make it black, without making the labels black? legend(title = 'Channel Integration', 0.7, 0.3, c('loudness','luminance'), col = c('red', 'blue'), text.col = c('red', 'blue'), lty = 1, xjust = 0.5, bty = 'n') _____________________________ Professor Michael Kubovy University of Virginia Department of Psychology USPS: P.O.Box 400400 Charlottesville, VA 22904-4400 P...

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi all! I'm testing with a Grandstream BT200 telephone and, according to I read, it has a LED that blinks if for that extension messages were left. In "Voice Mail UserID", under the "ACCOUNT" tab, I put *100 that is the extension in which my Asterisk answer the voicemail service and if then I press MESSAGE button, the

http://www.loreal.free-mascara.com L''OREAL Volume Shocking Mascara is a 2-in-1 mascara with a base coat at one end of the mascara wand and a top coat at the other. Bring on super-lush, luminous lashes in just 2 easy steps! -- Posted via http://www.ruby-forum.com/. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google

Hi there are some predefined self-start functions, like SSmicmen, SSbiexp, SSasymp, SSasympOff, SSasympOrig, SSgompertz, SSflp, SSlogis, SSweibull, Quadratic, Qubic, SSexp (nlrwr) Btw, do you know graphic examples for this functions? The SSexpDecay (exponential decay) for y = (y0 - plateau)*exp(-k*x) + plateau from

...ariables. Indexing by one variable is easy: library(colorspace) x <- seq(from=0, to=1,len=30) z <- outer(x,1i*x,"+") image(Re(z),col=hcl(seq(from=0,to=100,len=15),c=100)) OK, so far so good. Now, I want the colour to be a more complicated function of z, in which both the hue and luminance change (thus the colours cannot be ordered): f <- function(z){hcl(h=100*Re(z),l=100*Im(z))} I want to draw z in terms of the colour defined by f(): image(z,col=f) image(f(z)) but these don't work as intended. How do I use image() to get what I want? I can get close using plot(): x &...

This patch fixes a few non-ASCII characters which were displayed wrong, adds news about Pono and adds a few artists to the links page --- comparison.html | 10 +++++----- feeds/feed.xml | 18 +++++++++++++++++- links.html | 3 +++ 3 files changed, 25 insertions(+), 6 deletions(-) diff --git a/comparison.html b/comparison.html index 8e6b74b..daa0906 100644 --- a/comparison.html +++

Hi how can I find, in a vector of characters, which is the most frequent one? Thanks Gabriele Zoppoli, MD Ph.D. Fellow, Experimental and Clinical Oncology and Hematology, University of Genova, Genova, Italy Guest Researcher, LMP, NCI, NIH, Bethesda MD Work: 301-451-8575 Mobile: 301-204-5642 Email: zoppolig at mail.nih.gov

Suppose we start with data("Titanic") mosaic(Titanic, shade = TRUE) How do I combine the dashed box contours of shading_Friendly to indicate negative residuals, with three levels of gray: dark for abs(Pearson Resid) > 4, lighter for 4 > abs(Pearson Resid) > 2, and lightest for bs(Pearson Resid) < 2 ? Thanks, Michael ______________________________________________

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