Fred Weinhaus on wrote...
| Jan,
|
| You can use -compose difference to get the absolute difference
| between two image.
|
| Then you can use -compose lighten to get the lighter (max) of two
| images and you can do that in succession to get the lighter of a
| sequence of images.
|
| So try this as I think it functionally does what you are trying to do with
-fx:
|
| convert image1 image2 image3 ... imageN -average averageimage
| convert \( image1 averageimage -compose difference -composite \) \
| \( image2 averageimage -compose difference -composite \)
| -compose lighten -composite \
| \( image3 averageimage -compose difference -composite \)
| -compose lighten -composite \
| .
| .
| .
| \( imageN averageimage -compose difference -composite \)
| -compose lighten -composite \
| resultimage
|
| Where resultimage should have at each pixel, the furthest absolute
| value from the mean from all the images.
|
| Too bad -compose lighten -composite only seems to work correctly two
| at a time. It would be nice if one can do a list of images as
| -flatten allows and as -average allows. Would be nice to have a bunch
| of multi-image operators such as average, min, max, median of a
| sequence of images operating pixel-by-pixel.
|
Ohh... yess...
that would be a bug in my previous script.
-flatten has a 'background base image' As such if you want to
'maximize' values (Lighten) then you will need to also set -Background
Black!!
My corrected version (for any number of images, in one command)
from my own response is thus...
convert image?.png \
\( -clone 0--1 -average \
null: -clone 0--1 -compose Difference -layers Composite \
-colorspace Gray \
\( -clone 0--1 -background Black -compose Lighten -flatten \
null: +insert \) \
-alpha Set -compose ChangeMask -layers Composite \
null: +insert \) \
-alpha set -compose DstIn -layers Composite \
-background None -flatten depth_field_merge.png
Of course I can NOT properly test this without some example images.
Anthony Thyssen ( System Programmer ) <[EMAIL PROTECTED]>
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Anthony's Home is his Castle http://www.cit.gu.edu.au/~anthony/
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