How long does it take to fall through a ball of ice?

Planet FrictionlessIceball has a straight, narrow tunnel connecting two points on its surface. How long does it take to slide through the tunnel? Simplifying assumptions As with most story problems, we have to make some simplifying assumptions. But I think they’re fairly reasonable. We assume the faller starts out motionless, at one end of the…… Continue reading How long does it take to fall through a ball of ice?

How is a JPEG image’s color type determined?

In order to decode and display a JPEG image, you have to know what “color type” (or “color model”) it uses. There are several possibilities that your software probably ought to handle: Grayscale YCbCr (transformed from RGB) RGB YCCK (transformed from CMYK) CMYK Unfortunately, if you look at all the bits and bytes that make…… Continue reading How is a JPEG image’s color type determined?

Summary of some Win32 I/O character encoding behavior

This post is about programming a Windows Win32 application, mainly one that uses the console (command line). It summarizes the results of some tests I performed. Maybe you ported a Unix utility to Windows, but you find that it doesn’t work with filenames that contain Japanese characters. This information may help, though specific recommendations will…… Continue reading Summary of some Win32 I/O character encoding behavior