PixInsight Forum (historical)

PixInsight => General => Off-topic => Topic started by: Nigel Ball on 2010 October 29 03:48:48

Title: Star Trails
Post by: Nigel Ball on 2010 October 29 03:48:48

Hi

Maybe be a daft question but here goes

I'm looking at doing some star trail photography. There will be a number of 15-30s exposures (wide field) to be stacked say 200+ with no alignment

Is it possible to stack Star Trails images in PI?

Nigel

Title: Re: Star Trails
Post by: NKV on 2010 October 29 04:24:56

ImageIntegration:
 Combination: Maximum

Title: Re: Star Trails
Post by: Nigel Ball on 2010 October 29 05:47:35

Thanks  :D

Title: Re: Star Trails
Post by: ManoloL on 2010 October 29 08:10:14

Hello everyone
An example of this is possible:
http://pixinsight.com/forum/index.php?topic=822.0

Geetings.

Manolo L

Title: Re: Star Trails
Post by: Nigel Ball on 2010 October 29 10:52:10

Manolo

Thank you for the link

I see you combined 88 images of 5 minutes at ISO 400 f/6.7

If I understand correctly you then combine using the Maximum option?

Would you be able to give me an idea of the workflow in English?

Thanks

Nigel

Title: Re: Star Trails
Post by: Enzo De Bernardini on 2010 October 30 14:05:25

Maybe this script can be useful:

http://pixinsight.com/forum/index.php?topic=2122.0 (http://pixinsight.com/forum/index.php?topic=2122.0)

Best regards,

Enzo.

Title: Re: Star Trails
Post by: Nigel Ball on 2010 October 31 10:51:07

Thanks Enzo

I've downloaded the script and will give it a try once I've collected some data

Nigel

Title: Re: Star Trails
Post by: ManoloL on 2010 October 31 13:50:45

Hello everyone
A very interesting script.
I will try to recover my old files with RAW used to make star trails and use the script with them.
As for subtracting the masterdark, if this is the same as in my case, for the series of images, the result should be similar to making a single subtraction of result of the sum of maxima.
On that occasion I made a sum of maxima of darks, instead of a masterdark to subtract from the sum. Later I realized that this was not a good procedure, because the sum of maximum of the darks produced an image that had elevated random points that were not in the maximum sum of the traces, and subtracting this image originated black spots on the result of subtraction.

Greetings.

Hola a todos:
Un script muy interesante.
Voy a intentar recuperar mis viejos archivos con los RAW  utilizados para hacer trazas de estrellas y utilizar el script con ellos.
En cuanto a restar el masterdark, si este es el mismo, como es mi caso, para la serie de imagenes, el resultado debe ser similar haciendo una única resta al resultado de la suma de máximos.
En aquella ocasión yo hice una suma de máximos de darks, en vez de un masterdark, para restarlo de la suma. Mas tarde comprobé que ello no era un buen procedimiento, pues la suma de máximos con los darks producía una imagen en la que habia puntos aleatorios con valores elevados que no aparecían en la suma de máximos de las trazas,  y al restar esta imagen,  originaba puntos negros en el resultado de la resta.
Saludos.

ManoloL