RPPHOTO  I like this funny app, which also actually works. Never seen an app grow in version numbers so quickly, already at number 5. It does get alot of updates, though.  (Version 5.0)

PAUL YOUNG  You may not have noticed that the "Darkness" slider also dims the picture. You can make the picture completely impossible to see if you move this slider to the far left. Bring the slider up until the picture is just visible.

Paul Young, CSoM  (Version 5.0)

PAUL YOUNG  Robert, excellent question on timing. The on-screen time is the time that the information is sent to the screen but different displays have different response times. A flashed message on a slow display will be slower to decay.

Paul Young, CSoM  (Version 4.5)

ROBERT  With which CPU and graphics cards do the timing selections test as accurate for pictures?

Every setting seems the same--actually the shorter settings seems longer, though this may be because of my expectation that they be less noticeable. I find every image readily recognizable and quite superliminal. Images are even more intrusive by the white background that is flashed around them to fill the entire screen.

Oddly, pictures must be kept in a fixed subfolder of ~/Documents instead of a selectable folder or even a subfolder in... ~/Pictures. To make your images available to the program, you can make an alias to your folder of images, move it under ~/Documents, and rename it to "SMPictures".  (Version 4.5)