Import HD to iMovie may be easy to you but it is difficult to other people. Why? The main reason is that your HD videos formats is iMovie supported but the other is not.
Let us learn more. HD formats including HD Divx, HD Xvid, HD AVI, HD MOV, HD H.264, HD MPEG-4, HD MPG, HD WMV etc. In these formats, some formats can be accepted directly by imovie but some are not. So if your HD video is not recognized by imovie, you must convert your HD videos formats(such as mp4, dv, mov etc).
But you may ask how to convert/import HD to iMovie. HD to iMovie Converter For Mac is your the most ideal choice. With it, you can convert HD video to the formats which iMovie support with any quality loss.
With HD to iMovie Converter you can select your favorite part of HD video for converting by Trim, remove unwanted black edges of HD video by Crop, adjust the video Brightness, Contrast and Saturation by Effect, set the output parameters of HD video by Settings.