Hello.  Appreciate your continued guidance on this.  I got the canvas size 
down to a usable state so I can open it in GIMP now.  Still having trouble 
with the blending, though.  I tried Bruno's white balance suggestion, and 
then spent a while fiddling with a bunch of different options to see if I 
could come up with anything, but no luck.  I've uploaded scaled versions of 
the remmaped files, plus the full image and PTO file for reference, here:

https://boxdog.legroom.net/public/transfer/

Looking closely at the source images, it looks like there is a little color 
difference between the two left-most segments and the rest of the map (even 
though it was all scanned under the same conditions), but nowhere near 
what's shown in the final image.  I also noticed that the second column is 
oddly darker as well - look at the water below point 2 and to the left of 
point 1 around the bottom center of the map.  All of the water should be a 
reasonably uniform blue, except for those 4 stains in the upper-left.

On Wednesday, April 7, 2021 at 5:48:32 AM UTC-5 Monkey wrote:

> If the remapped images don't show the difference in colour, but the blend 
> still does, could you output a reduced size remapped image set and upload 
> it somewhere?
>
> On Tuesday, 6 April 2021 at 22:00:38 UTC+1 [email protected] wrote:
>
>> On Tue 06-Apr-2021 at 13:46 -0700, Jared wrote:
>> >
>> >I have one additional question, if you don't mind - the stiching came out
>> >well, but the blending is off. Here's a much smaller version of the
>> >stiched image for reference:
>> >https://boxdog.legroom.net/public/ffmap-example.jpg
>> >
>> >Note that the left column is darker than the rest. The source images
>> >aren't like that - they're uniformly blue. I suspect it's those dark
>> >splotches, I guess some kind of oil or water stains, that's throwing off
>> >the blending. Is there any reasonably straightforward way to tune that to
>> >get the original brighter blue across the full image? Both enblend and
>> >multiblend produced similar results.
>>
>> Hugin will try and optimise the brightness and colour of your images 
>> to match if you ask it to, but your PTO project has default values 
>> for photometric parameters. So it looks like your photos are 
>> different somehow.
>>
>> In the Photos tab, optimise Photometric -> Low dynamic range, 
>> variable white balance.
>>
>> -- 
>> Bruno
>>
>

-- 
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