Author Topic: process to make slightly different subs the same density?  (Read 133 times)

Offline jamesRC

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Hi ppl,

In one of my mosaic making efforts, I got a finished mosaic in which the individual panels apparently had slightly different brightness. I would like to correct the individual panes to be the same brightness for smooth merging in the mosaic. How can I do this? This would be useful in other ways too. I think maybe there is a process to do that but i can't remember the name. Or I imagined it.

Can anybody help out with this?  Thanks!

James

Offline John_Gill

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Re: process to make slightly different subs the same density?
« Reply #1 on: 2019 October 16 11:16:31 »
Hi,

When doing the StarAlignment select "Frame Adaption" or perhaps use LinearFit on the individual images before doing SA.

space is not black
John
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Offline pfile

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Re: process to make slightly different subs the same density?
« Reply #2 on: 2019 October 16 12:02:15 »
you cant use linearfit because linearfit can only be used on images which are registered to one another... but there is a script out there called DNALinearFit (DNA = David N Ault) that first computes the intersection between two mosaic panes, then computes the linear fit and applies it to the target image.

to a certain extent the GradientsMergeMosaic process also normalizes the frames a little bit but only in the vicinity of the seam.

rob

Offline dave_galera

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Re: process to make slightly different subs the same density?
« Reply #3 on: 2019 October 16 12:34:45 »
DNALinearFit does the job and works very well
Dave

Offline jamesRC

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Re: process to make slightly different subs the same density?
« Reply #4 on: 2019 October 16 13:09:49 »
Thanks for replying, guys. I'll check these things out.

James ^-^