colortransform | 易学教程

How does on-screen color inversion work in OS X?

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问题 This is what OS X's built in color inversion feature can turn your screen into: It can invert all colors, turn them grayscale, adjust contrast. Now I want to build my own implementation and therefore need a professionals' advice. Inability to capture inverted screen made me thinking that inversion is a sort of an adjustment layer, that resides above all windows and simply is not exposed to the interaction events. Is that so? Is it done via OpenGL libs? I don't look into actual coding help,

R: custom ggplot2 color-transform gives error in labels

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问题 Basically, i have a dataframe with 3 numeric vectors(x,y,z), and lets say i wanna make a scatter plot of x,y colored by z. I want to transform the colorscale with a squareroot that respects sign, so i made my own with trans_new. Here is a simple dataset, but with the actual transform. library(ggplot2) library(scales) set.seed(1) plot<-data.frame(x=rnorm(100),y=rnorm(100),z=rnorm(100)) super_trans <- function(){ trans_new('super', function(X) sapply(X,function(x) {if(x>0){x^0.5} else{-(- x)^0

How does on-screen color inversion work in OS X?

阅读更多关于 How does on-screen color inversion work in OS X?

This is what OS X's built in color inversion feature can turn your screen into: It can invert all colors, turn them grayscale, adjust contrast. Now I want to build my own implementation and therefore need a professionals' advice. Inability to capture inverted screen made me thinking that inversion is a sort of an adjustment layer, that resides above all windows and simply is not exposed to the interaction events. Is that so? Is it done via OpenGL libs? I don't look into actual coding help, but rather a design/approach on solving the problem. In my goal app I will need to define output color

Change header background colour when page scrolls

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I've been looking at a solution for this but I cannot get it to work. I would like my page header to change from a transparent background to a white background as the user begins scrolling the page. HTML code is: <div class="header"> <div class="topbar"></div> <div class="sitelogo"></div> <nav id="navigation"> <ul> <li id="twitter"><a href="http://www.twitter.com/iamdanmorris"><em>Twitter</em></a></li> <li><a href="#contact">Contact</a></li> <li><a href="#blog">Blog</a></li> <li><a href="#">Portfolio</a></li> <li><a href="#">About</a></li> <li><a href="#">Home</a></li> </ul> </nav> <div style=

Change header background colour when page scrolls

阅读更多关于 Change header background colour when page scrolls

问题 I've been looking at a solution for this but I cannot get it to work. I would like my page header to change from a transparent background to a white background as the user begins scrolling the page. HTML code is: <div class="header"> <div class="topbar"></div> <div class="sitelogo"></div> <nav id="navigation"> <ul> <li id="twitter"><a href="http://www.twitter.com/iamdanmorris"><em>Twitter</em></a></li> <li><a href="#contact">Contact</a></li> <li><a href="#blog">Blog</a></li> <li><a href="#"