For those who aren't familiar with the Gimp's "Color to Alpha" feature yet, here is the page on it from the Gimp's documentation: Color to Alpha. It does a really good job, and I wonder much how ex...

I noticed some weird behavior when resizing the plot window. Consider library(sp) library(rgeos) library(raster) rst.test <- raster(nrows=300, ncols=300, xmn=-150, xmx=150, ymn=-150, ymx=150, c...

I have a problem when joining two antialiased lines when using a blending mode, I get a dip at the point where they join. By blending mode I mean that I draw my antialiased line by calculating the ...

I'm trying to produce a raster graph (like a hovmoller diagram) and was hoping someone might help. I've looked at the help with rasterVis and some others but can't seem to get their examples to sui...

What is the general algorithm of rasterizing vector image? I've found a lot of algorithms of rasterizing primitives such as lines, circles, Bezier curves etc. But for general, what should I do? Sim...

I am trying to use R to create a raster image from a matrix of data. However, I am getting some weird artifacts on the edge of my image. The code I am using is as follows: # From the example for ...