Recently, I was trying to use the Gimp File->Open Location menu item under windows (which is great for snagging png files off the web, as copy paste in/Windows doesn't support transparency properly... but that is a different issue...). I was stuck behind a proxy and it wouldn't work. Googling for 20-30 minutes provided nothing. Nothing in the docs. Hmmm.
I dug into the source code and did a bit of troubleshooting and discovered that Gimp compiled for Windows uses WinHTTP to download URI's. And WinHTTP does not use the normal computer's Internet Explorer network connection settings! The only way to change this setting is by using a command line program.
Another update to my histogram match script. Now with a whole bunch of channel options - In addition to Value and RGB, there is now HSV, HS, LAB, AB, YCrCb, and CrCb. If the images are real close, like two exposures of the same scene, try RGB. To transfer the colours, try AB (preserve L) or CrCb (preserve Y).
EDIT: One more change to the uploaded file, the script not decides if rescaling is needed and does it automatically to an optimal size.
A few improvements have been made to my histogram match script. The big new features include histogram interpolation, and adjustments for saturation and contrast. Special thanks to Isomage who helped with some of the scheme subroutines.