Function for Adding Transparency to JPEG (Output = PNG)

..see the function-code HERE.

An Image Crossfader Function

Some project offspin, the jpgfader-function (the jpgfader-function in funny use can be viewed HERE):

Add Transparency to JPEG - Yes, We Can!

...Just read in your JPEG and add an alpha channel manually, then assign values for transparency. Of course for printing you need to use a device that accepts alpha.

See how it's done HERE.

Plot Animation with Imported Images

...I really dig the animation package! ..so here's the outcome of my firsts encounters with saveHTML() - I produced an animation with pre-existing images by utilizing the functions readJPEG() and rasterImage() from the R-packages jpeg and ReadImages. Credit goes out to xingmowang (nzprimarysectortrade-blog) from whom I picked up the concept of putting images to the plot region of a graph produced with the animation-functions.