Re: Request for sample image files


Jun 23, 2005

 


----------------------------

#18960 Jun 23, 2005

I'm currently writing a MaximDL plugin to provide support for Drizzle

stacking, as pioneered in the early days of the Hubble space telescope.



It looks quite interesting, especially for undersampled images.



However, currently I'm living abroad from where all my astro kit is

located and I'm unable to capture some sample images to test my plugin

against.



Thus my request here - does anyone have a decent set of raw,

unprocessed FITS files they can make available for me to download,

showing a set of sub-exposures on a target, ideally with them

undersampled, say a plate scale of 4arcsec/pixel or more?

I'd like a good number of subs of the same target, so that the drizzle

algorithm can work effectively, say twenty or more.

The undersampling isn't essential, since I can always try to

downsample the images before stacking to simulate that effect.



As with all my recent plugins, I'll be making it freely available as

soon as it's working, in the hope it's useful to other people.



Regards,



John



----------------------------

#18961 Jun 23, 2005

John



Where can go and check the other plug-ins you have?



Larry



--- In MaxImDL@yahoogroups.com, "John Winfield" winfij@n...> wrote:

> I'm currently writing a MaximDL plugin to provide support for

Drizzle

> stacking, as pioneered in the early days of the Hubble space

telescope.

>

> It looks quite interesting, especially for undersampled images.

>

> However, currently I'm living abroad from where all my astro kit

is

> located and I'm unable to capture some sample images to test my

plugin

> against.

>

> Thus my request here - does anyone have a decent set of raw,

> unprocessed FITS files they can make available for me to download,

> showing a set of sub-exposures on a target, ideally with them

> undersampled, say a plate scale of 4arcsec/pixel or more?

> I'd like a good number of subs of the same target, so that the

drizzle

> algorithm can work effectively, say twenty or more.

> The undersampling isn't essential, since I can always try to

> downsample the images before stacking to simulate that effect.

>

> As with all my recent plugins, I'll be making it freely available

as

> soon as it's working, in the hope it's useful to other people.

>

> Regards,

>

> John



----------------------------

#18962 Jun 23, 2005

Hi Larry,



Unfortunately, my webserver is also offline due to my travels, but

the plugins themselves are uploaded to the files area of this Yahoo

group.

I've created an upload folder for my files at:



groups.yahoo.com/group/MaxImDL/files/John%20Winfield/



The debayer plugins for one-shot colour cameras are pretty self

explanatory, but the multi-star guider plugin is a bit more tricky

to use, although a quick search of the archives should throw up some

posts describing it's use and effectiveness.



Regards,



John







--- In MaxImDL@yahoogroups.com, "Larry Summers" larsummers@y...>

wrote: > John

>

> Where can go and check the other plug-ins you have?

>

> Larry

>

>

> --- In MaxImDL@yahoogroups.com, "John Winfield" winfij@n...>

wrote: > > I'm currently writing a MaximDL plugin to provide support for

> Drizzle

> > stacking, as pioneered in the early days of the Hubble space

> telescope.

> >

> > It looks quite interesting, especially for undersampled images.

> >

> > However, currently I'm living abroad from where all my astro kit

> is

> > located and I'm unable to capture some sample images to test my

> plugin

> > against.

> >

> > Thus my request here - does anyone have a decent set of raw,

> > unprocessed FITS files they can make available for me to

download, > > showing a set of sub-exposures on a target, ideally with them

> > undersampled, say a plate scale of 4arcsec/pixel or more?

> > I'd like a good number of subs of the same target, so that the

> drizzle

> > algorithm can work effectively, say twenty or more.

> > The undersampling isn't essential, since I can always try to

> > downsample the images before stacking to simulate that effect.

> >

> > As with all my recent plugins, I'll be making it freely

available > as

> > soon as it's working, in the hope it's useful to other people.

> >

> > Regards,

> >

> > John



----------------------------

#18963 Jun 23, 2005

One additional very important point - the Drizzle algorithm relies

on the input images being randomly dithered, so if the images are

autoquided then dithering must have been used.

If they were not taken with autoguiding, then the PEC of the mount

will probably "dither" the images enough for Drizzle to work with.



Cheers,



John



--- In MaxImDL@yahoogroups.com, "John Winfield" winfij@n...> wrote:

> I'm currently writing a MaximDL plugin to provide support for

Drizzle

> stacking, as pioneered in the early days of the Hubble space

telescope.

>

> It looks quite interesting, especially for undersampled images.

>

> However, currently I'm living abroad from where all my astro kit

is

> located and I'm unable to capture some sample images to test my

plugin

> against.

>

> Thus my request here - does anyone have a decent set of raw,

> unprocessed FITS files they can make available for me to download,

> showing a set of sub-exposures on a target, ideally with them

> undersampled, say a plate scale of 4arcsec/pixel or more?

> I'd like a good number of subs of the same target, so that the

drizzle

> algorithm can work effectively, say twenty or more.

> The undersampling isn't essential, since I can always try to

> downsample the images before stacking to simulate that effect.

>

> As with all my recent plugins, I'll be making it freely available

as

> soon as it's working, in the hope it's useful to other people.

>

> Regards,

>

> John







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