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Main
Date: 25 Jul 2007 18:18:06
From: Paul Buglass
Subject: Assistance finding LRGB image registration tutorial please
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Hi All,
I recently took my first set of LRGB images and now wish to align them.
The problem I have is each LRGB final image is of slightly different size
due to stacking sub exposures and the stacking application croping the final
stacked image of each set.
I am new to using Photoshop so I'm looking for a step by step tutorial to
take me through registering the images and combining the layers to produce a
final image LRGB result.
Please can anyone recommend such a tutorial? I've found some, but they seem
to start from LRGB images which are already registered and are of equal
size, so I fail at the first hurdle trying to open and register layers with
different sizes of image :-(.
Any useful pointers would be much appreciated.
Very best wishes and clear, dark skies.
--
Paul B, York, UK.
York Astronomical Society
www.yorkastro.co.uk
Please buy from the YAS web shop and help YAS raise funds
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Date: 26 Jul 2007 04:30:51
From: Davoud
Subject: Re: Assistance finding LRGB image registration tutorial please
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Paul Buglass wrote:
> Hi All,
>
> I recently took my first set of LRGB images and now wish to align them.
>
> The problem I have is each LRGB final image is of slightly different size
> due to stacking sub exposures and the stacking application croping the final
> stacked image of each set.
Different sizes, different resolutions... this calls for Registar
<http://www.aurigaimaging.com/ >. There is no competition when the
images are of different sizes/resolutions/orientation.
> I am new to using Photoshop so I'm looking for a step by step tutorial to
> take me through registering the images and combining the layers to produce a
> final image LRGB result.
You don't want to use Photoshop for this purpose. It can be done, but
not easily in your circumstances.
> Please can anyone recommend such a tutorial? I've found some, but they seem
> to start from LRGB images which are already registered and are of equal
> size, so I fail at the first hurdle trying to open and register layers with
> different sizes of image :-(.
Yep, definitely Registar. Pay no attention to its arcane, unfriendly
file handling interface. Just put your images in a single folder and
ignore groups & whatever else Registar refers to. That'll give the same
great results without the frustration.
Davoud
--
usenet *at* davidillig dawt com
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Date: 26 Jul 2007 22:04:19
From: William R. Mattil
Subject: Re: Assistance finding LRGB image registration tutorial please
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Davoud wrote:
> Paul Buglass wrote:
>
>> Hi All,
>>
>> I recently took my first set of LRGB images and now wish to align them.
>>
>> The problem I have is each LRGB final image is of slightly different size
>> due to stacking sub exposures and the stacking application croping the final
>> stacked image of each set.
>
> Different sizes, different resolutions... this calls for Registar
> <http://www.aurigaimaging.com/>. There is no competition when the
> images are of different sizes/resolutions/orientation.
That is not how I read the OP's statement. If the images were all taken
with the same instrument/camera then regardless of the crop they should
register just fine without the use of Registar.
>
>> I am new to using Photoshop so I'm looking for a step by step tutorial to
>> take me through registering the images and combining the layers to produce a
>> final image LRGB result.
Google up Jerry Lodriguss. He has a lot of processing tips on-line and
aligning the images in Photoshop isn't all that difficult. Basically the
idea is to create a blank canvas the size of which should be larger than
your image. You then paste in the individual images as layers and then
use the move tool to align them.
Further, the OP already has Photoshop and while perhaps not experienced
with it the technique for doing this is a valuable resource and hence a
useful exercise. Registar requires an additional purchase and while you
are correct that it *will* work, there is an additional learning curve
to that as well. As long as the image scale of the images is the same it
makes more sense to use Photoshop.
Bill
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Date: 25 Jul 2007 23:55:22
From: Terry B
Subject: Re: Assistance finding LRGB image registration tutorial please
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"Paul Buglass" <paulremovethis.buglass2005@btremoveinternet.com > wrote in
message news:A9KdnZG7oJBWGDrbnZ2dnUVZ8v2vnZ2d@bt.com...
> Hi All,
>
> I recently took my first set of LRGB images and now wish to align them.
>
> The problem I have is each LRGB final image is of slightly different size
> due to stacking sub exposures and the stacking application croping the
> final stacked image of each set.
>
> I am new to using Photoshop so I'm looking for a step by step tutorial to
> take me through registering the images and combining the layers to produce
> a final image LRGB result.
>
> Please can anyone recommend such a tutorial? I've found some, but they
> seem to start from LRGB images which are already registered and are of
> equal size, so I fail at the first hurdle trying to open and register
> layers with different sizes of image :-(.
>
> Any useful pointers would be much appreciated.
>
>
> Very best wishes and clear, dark skies.
>
> --
>
> Paul B, York, UK.
>
> York Astronomical Society
> www.yorkastro.co.uk
> Please buy from the YAS web shop and help YAS raise funds
>
I use Iris to register my images. It is free and quite powerful. There are
algorithms for scaling images also. You can then play with the imge in PS if
you like.
see http://www.astrosurf.com/buil/us/iris/iris.htm
A tutorial is at http://www.astrosurf.com/buil/iris/tutorial2/doc11_us.htm
Terry B
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