| Colour Balancing Tiff Images [message #36946] |
Thu, 13 November 2003 10:41 |
ian
Messages: 26
Registered: February 1992
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Junior Member |
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Hi All,
Here's one that I hope you can help me with. I am putting together a
mosaic of satellite imagery that consists of orthorectified, black and
white tiffs. The problem is that the software I'm using seems to have
difficulty colour balancing the tiffs as the mosaic is made, resulting
in a mosaic that you can see "cut-lines" in.
We want to avoid this as much as possible, so we have moved to IDL 6.0
on Windows 2000 Pro for a (hopefully) more intelligent colour
balancing solution. I have downloaded David Fanning's HISTOMATCH
program (thank you, by the way) and I have it up and running on small
tiles of the mosaic. The results look very good.
However, I am trying to work with the larger, full images that range
from 800MB to 1.2 GB. So, it appears that IDL's memory limitations
are going to affect me (the 800 MB tiff won't load into IDL, so my
current 1GB of RAM isn't going to cut it).
First of all: am I correct in assuming that the ~1 GB memory
limitation is still an issue with IDL? If so, I assume upping the RAM
won't really help.
Second: Has anyone faced this kind of problem before? Would tiling my
large tiffs work? I suppose I could sum the histograms of my
reference tiff and thus create the histogram that I need to match to
and then apply it to tiles of the image I want to colour balance.
But, if I am balancing individual tiles, am I going to have problems
with matching within my large tiff?
Any help would be appreciated. Thanks.
Ian
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