(Up to the Homepage)
Examples for Unshake 1.3 have been moved.
It might not be obvious what settings to use to clean up your own images, so on this page I'll put some examples, which might help. Be warned! Some of these images will be big. (The thumbnails are usually parts of the picture. Click to see the full image.)
| This picture of Bath from Solsbury Hill was shaken by about
9 pixels from top right to bottom left, and taken on a hazy
day. It needs to be deconvolved - a simple sharpening filter
will just sharpen the shake.
Un-ticking "select blurred" forces Unshake to estimate the blur from the entire picture, not just the visible part. This gives better results, if the blur us more or less the same over the entire picture.
| Next I requested more accuracy in the calculation by asking
for the estimated time "x100" to be used, and selected "severe
blur". The program usually finishes within "x5" the
estimated time, but asking for "x100" guarantees that if it
needs more time, then it will take it.
The bottom left-hand corner is not deconvolved as well as the rest - the shake seems to be different here.
|A half-size picture gives similar results, except that I could use "normal blur", since the shake is only about 4.5 pixels now.||This processes quite quickly - time "x5" is easily enough.|
|When I decided to call Unshake 1.4 "Meerkat", I thought I'd find a picture of one and deconvolve it. The image links to a small view of the image, this original file is 1.9 MegaBytes. Simple sharpening algorithms can do a good job on this one, but it is still a good illustration of how to use the program.||Once I had cut out a region of about 1000 by 1000 pixels including both meerkats, I found that the window held by chance exactly the right region - lots of leaves, and no log: Unshake works best on images which are quite disordered, and by default the blur is calculated from the visible part of the picture.|
|Now I set the time the program can take to "x100". All other settings are left at default.|| ...and here's the result (524kB). I can be much braver in
the photos I take nowadays - but beware dust on the scanner!
Note that there is bound to be a linear filter to be found which gives good results. The point of Unshake is that it finds such a filter for you and applies it.
|Now if I had been foolish, I could have put the log in the centre of the view. The grain of the wood points in similar directions, so can be mistaken for very severe shake. Changing the setting from "normal blur" to "severe blur" makes the situation worse, enabling Unshake to see even more false "shake".||And the result is quite horrible. Unshake is not entirely automatic - you do have to use some common sense. Mind you, it did remove a lot of the grain.|
© M.D. Cahill 2003.