Exporting a single frame as a high quality Jpeg> Is it Possible?

Park the playhead in front of your favourite frame > File > Export > Using QT conversion > format = Still Image, OPTIONS > Jpeg. Save.

Luca

Hi -
The easiest way is to place the playhead in the timeline on the frame you want to export and go to the menu File > Export > Using Quicktime Conversion and when the dialog box opens, towards the bottom of the box select Format: Still Image, click the Options button and select the format you want (in this case JPEG).
Set a name and a destination and you will have your still.

Note that it will not exceed the resolution of your video, which is 1440 x 1080 at 72 dpi. There are third party Photoshop plug-ins that can attempt to up rez the photo, to what extent they will be successful is for you to judge.

MTD

A better way to do this and preserve the image is to export a short segment of the video on current settings that includes what you want to grab.

Then open it in the QT player, move the frame you want and then do a coomand shift4 drag copy.

Looks much better.

That would create a PNG not a JPeg by default.
Regarding quality and look, not really, you can't get any better quality than the source quality and if your QT player window is enlarged you get an odd frame size and not so good images.

I've tested this, and I'm simply reporting my subjective experience.

It appears to be consistently a better quality image, in the correct aspect ratio, and with better color space.

My clients also report a better image.