xv is a program written by John Bradley to display and modify digital images under the X Window System – and OS X as well

• http://en.wikipedia.org/wiki/Xv_(software)
• http://www.trilon.com/xv/
• http://www.trilon.com/xv/manual/xv-3.10a/cover.html – The On-Line Version of the XV 3.10a Manual – in various formats incl. PDF
• https://en.wikipedia.org/wiki/X_Window_System

• xvdocs.ps resp. xvdocs.pdf – the orig. documents on my computers, NAS, …

xv has always been my (main) image viewer and modifier on all the Unix systems, ever since they ran the X Window System.

The Control Window

The xv controls window is the central point of control for the program, which just goes to show how appropriately it was named. It contains controls to resize the current image, flip and rotate it, load and save different files, and bring up the other xv windows. It can be brought up by clicking the Right mouse button in the image window, or by pressing the ? key inside any open xv window. Doing either of these things while the xv controls window is visible will hide it.

My Mac mice and my Mac touchpads do not have a Right mouse button, so a keyboard substitute for that is quite welcome.