FAQ

[Harry page]

Hi All

We often see repeated FAQ about pixinsight here ( of course  )  and with in Mind I am going to put a FAQ page on my website

So I am asking for suggestions 

Harry

[Geoff]

Good idea Harry. For a start Fits incompatibilities and "warning, no correlation between...."

[RickS]

Processes which should be used on linear/nonlinear data.

[jkmorse]

+1 on Geoff's suggestion.  I just posted this elsewhere, but would welcome you using a version of it:

Fixing FITS Incompatibilities
If you experience these types of incompatibilities, try the following until you hit on a solution:

First
•   Open the Format Explorer (access under “View > Explorer Windows”)
•   Double click on “FITS”
•   Make sure the top two boxes are checked
       o   “Write scaling keywords . . .”
       o   “Signed Integer images . . .”

Second
•   Where possible, particularly in the Image Calibration tool for Lights, but also with ImageIntegration when creating Master Darks and Master Bias, add the following to the “input hints” line under “Format Hints”:
       o   lower-range 0 upper-range 65535

Third
•   If the above does not work, insert the following in the “input hints” line:
       o   Signed-is-physical

Stop using input hints AFTER you have successfully saved an image after applying a PI tool; i.e, do not use input hints in ImageIntegration after successfully calibrating Light images in PI with the ImageCalibration tool (after first PI application, images are saved in proper PI format (0,1) and no longer need input hints)

For an excellent explanation of what is happening to cause this problem, check out the following threads from Juan Conejero:

http://pixinsight.com/forum/index.php?topic=3118.msg21348
http://pixinsight.com/forum/index.php?topic=3474,msg23973
http://pixinsight.com/forum/index.php?topic=3800.msg26086

Hope that helps,

Jim

[jkmorse]

Harry,

Another good one would be what processes to use masks with.

Best,

Jim

[CharlesW]

FAQ's can be helpful but they can also lead to, "Read the FAQ, stupid." I've seen it in other forums and I imagine some of you have, too.

[Harry page]

FAQ's can be helpful but they can also lead to, "Read the FAQ, stupid." I've seen it in other forums and I imagine some of you have, too.

I can only make the info available , its up to people if they read it

Harry

[dzso.bacsi]

Hi Harry,

From a newcomer/beginner standpoint - as I suggested it earlier, but now it disappeared from your site - it would still be a good "FAQ" topic to have a clue (or a small explanation) regarding what function/script does what, what is the goal(what is the typical usage and/or alternatives) and roughly where and when or on what circumstances it should/could be used in a workflow.
I have found many times that there are excellent tutorials (video or other) for a certain topic or problem - or even workflow (I know it is probably as many workflow as different gears and objects...) but watching and trying to understand them I still don't have a good understanding of why this or that function is used (sometimes instead of this or that function), what are the typical issues they mitigate or solve, where is the usual or typical place of it in a "workflow", etc.
Oh, and the most important thing: I would put with bold 16 into the first line of the FAQ:

"O vos qui intratis: go and watch Harry's PI tutorials before you abandon all hope..." 

[jerryyyyy]

Would be nice if the documentation were filled in for each procedure.....

[Harry page]

Would be nice if the documentation were filled in for each procedure.....

I was thinking of a few weeks work not a life times

Harry