Re: [MaxImDL] Re: Red, Blue, Green and Yellow Spots


Apr 18, 2010

 


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#40769 Apr 18, 2010

Hi,



I am gettin loads of red, green, blue and yellow spots on my images. I am using Maxim DL v5.08 and an Orion Starshoot v 2 ccd. Can anyone tell me what is causing this.



Many thanks and kind regards,



Paul



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#40770 Apr 18, 2010

Hot pixels. Dithering, and use of a statistical combine method (Min/Max Clip or similar) will help you control this. Usually, you will want 7 or more images to combine for best results, but dithering and a median combine might give you something useful with as few as three images in a stack.



Ron Wodaski

On Apr 18, 2010, at 12:48 PM, astromahoney wrote:



> Hi,

>

> I am gettin loads of red, green, blue and yellow spots on my images. I am using Maxim DL v5.08 and an Orion Starshoot v 2 ccd. Can anyone tell me what is causing this.

>

> Many thanks and kind regards,

>

> Paul

>

>

>

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

>

> Yahoo! Groups Links

>

>

>



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#40777 Apr 19, 2010

The spots can also be cosmic rays hits on the sensor during the image.



Yes, they _can_ change, but I don't know that more or less is they way it would go - someone else might know that aspect.



Ron Wodaski

On Apr 19, 2010, at 5:28 AM, astromahoney wrote:



> Hi Ron,

>

> Many thanks for your reply, I will give your suggestion a go.

>

> Also can you tell me whether the hot pixels increase in number with age of the camera or are they induced by imaging settings/conditions. I only ask because I never used to get as many hot pixels as I am now.

>

> Once again, thank you for your invaluable help.

>

> Kind regards,

>

> Paul

>

> --- In MaxImDL@yahoogroups.com, Wodaski - Yahoo yahoo@...> wrote:

>>

>> Hot pixels. Dithering, and use of a statistical combine method (Min/Max Clip or similar) will help you control this. Usually, you will want 7 or more images to combine for best results, but dithering and a median combine might give you something useful with as few as three images in a stack.

>>

>> Ron Wodaski

>>

>> On Apr 18, 2010, at 12:48 PM, astromahoney wrote:

>>

>>> Hi,

>>>

>>> I am gettin loads of red, green, blue and yellow spots on my images. I am using Maxim DL v5.08 and an Orion Starshoot v 2 ccd. Can anyone tell me what is causing this.

>>>

>>> Many thanks and kind regards,

>>>

>>> Paul

>>>

>>>

>>>

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

>>>

>>> Yahoo! Groups Links

>>>

>>>

>>>

>>

>

>

>

>

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

>

> Yahoo! Groups Links

>

>

>



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