13 replies to this topic

[Lacaille]

For interest, I attach my efforts from Canberra (9 December 2016 at 820 pm; with 8" SCT, ZWO120MM). 

This one is an attempt at colour using RGB filters + with a 610 nm filter as a luminance channel;




while this one is just with the 610 nm filter




While I am attracted to the idea of the colour image, perhaps it is a bit meaningless for Venus, given its appearance as a white hot ball in the eyepiece!

[ivan11223]

Sharp and amazing shot!

[Thomas Ashcraft]

Nice edges.

[Awesomelenny]

Gorgeous images!

[rotarum]

omg 

[Kokatha man]

Well done Bro!

[Lacaille]

Thanks for the kind comments Darryl and others!  It means a lot to me - it is certainly encouraging me to keep going with this difficult subject.

[Tyson M]

Excellent!

[stanislas-jean]

Very good images with your C8, which would be excellent.

I had also one excellent here for visual.

How do you expertise your results especially with the red filter 610?

Interrested to see about, because so said free of features out the violet segment.

Congratulations for your personal data.

Stanislas-Jean

[Lacaille]

Hi Stanislas-Jean,

 

Venus was at about 30 degrees here in Canberra at 2030 h .  I took 1 minute each of R, G, B and the 610 filter using Firecapture, adjusting gain and fps to get a 70% histogram.  I typically got about 5000 frames.  I processed 10% of frames in AS2, then did wavelets in Registax, then combined the resulting files as layers in GIMP, "colorifying" the RGB layers but using the 610 layer as a luminance layer to provide some detail.

 

 Hope this helps.  I have had some pretty weird colour results in the past!

 

Regards

 

Mark

[stanislas-jean]

Thanks a lot for the response.
However what can we encounter with RGB files and 610 filter files well combined on the same picture?
Well OK for good images but for reading data on.
This is a concern.
Stanislas-Jean

[Lacaille]

Hi Stanislas-Jean,

 

If I understand your concern, it is that the addition of the 610 image as a layer is creating may be creating artefacts, thus making the image less useful for any scientific purpose?  That may be so, but my provision above of the 610 monochrome image perhaps helps to provide a more pure source of data, in the (unlikely?) event that anyone wished to use the image for measurement.  

 

Anyway, I also provide here the RGB image (no 610 layer). 

 

 

In retrospect I am not sure there was any gain from using the 610 layer and I will reconsider whether I do that in future.   I have read concerns elsewhere about artefacts resulting from that kind of approach. I repeat the RGB+610 here for ease of comparison:
 

 

Regards

Edited by Lacaille, 17 December 2016 - 05:38 PM.

[CPellier]

Nicely done. Details well visible on the RG610 image. There is indeed some details to be seen in RGB, but of course they should not be mixed with RG610 (nor IR or anything). Details visible in RGB most of the time come from UV dark markings, still faintly apparent in the B layer, but some can come from red light:

 

[Lacaille]

Thanks Christophe - very insightful!  I must invest in a UV filter, and I will stop "over-egging the pudding" by adding layers to the RGB.  (I do remember reading your post about Mars!).