[magick-users] Crop, Tiles, and Ultra Large Images.

[Anthony Thyssen]

"Herbert Elwood Gilliland III" on  wrote...
| Well, let me give you a little more info.  I wanted to use your program to
| break up images that are 60000x50000 special format jpegs, which are
| readable by windows btw (windows generates thumbnails though it takes a bit
| of time), into a series of tiles that were of a manageable size ( less than
| 8000x8000 )
| 
| It's during this operation that it fails.  This was the only feature I was
| really interested in.  It's not like GIMP, Debabelizer or anything other
| than the OS and Photoshop can even read them or do so in a timely fashion.
| I was able to load them into the GUI version but it took like 20 minutes.
| Photoshop even takes 5 or 6 minutes.
| 
| By the way a lot of those commands don't make sense to me on Windows.
| 
Forwarded to IM users maillist for comment....

The commands in IM examples were written under a UNIX  (Linux/mac)
environment.  However they can generally be used with some changes in a
Widnows Batch Script environment.

See  http://imagemagick.org/Usage/api/#windows
for a guide and other window specific notes that have been sent to me.
(I am not a windows user)


Now.  It seems to me that the IM command "stream"
should be either converted into a new command called "tile_extract" or
something like that, as well as a reversed method, that will
use pipelined image processing techniques to convert images to and from
a set of tiles that "convert" can then handle better.

"stream" can extract a single 'crop' region from a larger image in this
pipelined way.  But only one area at a time, when it should be able to
generate all the tiles (with or without overlaps) from a ultra-large
image, in one run.  It could limit its output to files, and would only
need to have one row of tile images open at any one time.

I have also not heard of the reverse of the "stream" crop.  That is
re-forming a ultra-large image, using either tiles, or overlaying a
smaller crop region on an existing ultra-large image.

Can othe IM users report to me how thay are doing this type of
operations, forward or the reverse, so that I can include it in IM
examples.    Non-Im methods also accepted in this case, though usally
only with a link to some other site documenting that method.

  Anthony Thyssen ( Graphics Enthusiast )    <A.Thyssen at griffith.edu.au>
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  At 300 dpi you can tell she's wearing a swimsuit.
  At 600 dpi you can tell it's wet.
  At 1200 dpi you can tell it's painted on.
  I suppose at 2400 dpi you can tell if the paint is giving her a rash.
                                                      -- Joshua R. Poulson
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         IM Examples               http://www.imagemagick.org/Usage/