Best Way to Composite Venus Transit in PI

[kerrywaz1]

I took a lot of images of the transit of Venus as it made its way across the face of the sun. What is the best way to create a composite image using PI that will clearly show the planet's position througout the transit?

Thanks

[vicent_peris]

If your images are aligned, this would be a simple PixelMath expression:

Min( Img1, Img2, Img3, ... ImgN )


Regards,
Vicent.

[jdonald]

Simple he say

I often wondered how to do this in pixinsight.  What does that string do, in plain English?

[naavis]

Simple he say

I often wondered how to do this in pixinsight.  What does that string do, in plain English?

For each pixel in the stack, it takes the minimum value. So if you have several images of Venus at different positions on the sun's disk, the pixels containing Venus will be chosen for the final image (since they usually are darker than the sun).

[vicent_peris]

Simple he say

I often wondered how to do this in pixinsight.  What does that string do, in plain English?

For each pixel in the stack, it takes the minimum value. So if you have several images of Venus at different positions on the sun's disk, the pixels containing Venus will be chosen for the final image (since they usually are darker than the sun).

Exactly.

Another requirement for this is to have the Sun disk perfectly aligned in all the image set.


V.

[kerrywaz1]

I have over 100 images in the set. Is there a way to do this with an Image Container?

[Carlos Milovic]

You may use ImageIntegration. Just select Minimum as the Combination method.

[vicent_peris]

With 100 images I would go with ImageIntegration. Integrate them as a normal light set but instead of calculating the average value, calculate the minimum one. Also don't select any rejection method, as this would reject Venus. 


V.

[kerrywaz1]

Thanks guys. Here is the result.

[Giorgio]

Hello
good result, I really like.
Can you tell me what kind of tools did you use the resumption of the transit.
Thanks
Giorgio.

[kerrywaz1]

Thanks. This was as much as I could get of the transit before sunset.

I used a Takahashi FSQ106EDXIII with a Baader AstroSolar Safety Film homemade filter over the objective, AP1200 mount, QSI 683wsg CCD camera.

The focus in the images were 'soft' because of a high wind that kicked up during the transit.