Jump to content

Stargazers Lounge Uses Cookies

Like most websites, SGL uses cookies in order to deliver a secure, personalised service, to provide social media functions and to analyse our traffic. Continued use of SGL indicates your acceptance of our cookie policy.

sgl_imaging_challenge_banner_dslr_mirrorlesss_winners.thumb.jpg.9deb4a8db27e7485a7bb99d98667c94e.jpg

lensman57

RGB weights for Astronomik Type iic filters

Recommended Posts

Hi,

Does anyone know  what  RGB weights to use for the the above set of filters with an Atik 314L+ please? It will surely saves me a lot of processing time if I get the weights right in the first place. 

Many Thanks,

A.G

Edited by lensman57

Share this post


Link to post
Share on other sites

If no one answers, you can figure it out as follows:

"It requires an 18% grey card, available at most camera shops, and a full or nearly full moon. You make images of the card of equal exposures through each filter using the moon for illumination. You import each of them into Photoshop or whatever post processing software you use and merge them to form and RGB image. It should look pretty much like the grey card although it might be a little lighter or darker. Then you measure the values of each channel in one spot. The Color Sampler tool in Photoshop is great for this. A little simple math with those values will determine the correct ratios for each filter in a given camera."

Source:  http://www.cloudynights.com/item.php?item_id=2114

Cheers,

Paul.

Share this post


Link to post
Share on other sites

If no one answers, you can figure it out as follows:

"It requires an 18% grey card, available at most camera shops, and a full or nearly full moon. You make images of the card of equal exposures through each filter using the moon for illumination. You import each of them into Photoshop or whatever post processing software you use and merge them to form and RGB image. It should look pretty much like the grey card although it might be a little lighter or darker. Then you measure the values of each channel in one spot. The Color Sampler tool in Photoshop is great for this. A little simple math with those values will determine the correct ratios for each filter in a given camera."

Source:  http://www.cloudynights.com/item.php?item_id=2114

Cheers,

Paul.

Thank you Paul, I will give it a try  time I set up.

Regards,

A.G

Share this post


Link to post
Share on other sites

I'd advise taking a 1:1:1 weighted image into Pixinsight and then running DBE on it. Of all the colour balancing methods I've tried, this is most certainly the one. I use it on my images and it also works on the most insanely light polluted images which I'm sometimes involved with in processing. Given the varied levels and spectra of light pollution I very much doubt that any one weighting will be universally applicable.

Olly

Share this post


Link to post
Share on other sites

I'd advise taking a 1:1:1 weighted image into Pixinsight and then running DBE on it. Of all the colour balancing methods I've tried, this is most certainly the one. I use it on my images and it also works on the most insanely light polluted images which I'm sometimes involved with in processing. Given the varied levels and spectra of light pollution I very much doubt that any one weighting will be universally applicable.

Olly

Hi Olly,

Now that I have a licensed copy of PI, I might as well get used to its features.

Regards,

A.G

Share this post


Link to post
Share on other sites

Would you need moonlight?  Presumably using a grey card in sunlight would allow you to calculate white balance (the light source is, after all, G2V!)

Share this post


Link to post
Share on other sites

Would you need moonlight?  Presumably using a grey card in sunlight would allow you to calculate white balance (the light source is, after all, G2V!)

How is the grey card's greyness going to be defined? I'd have thought, though, that a neutral density filter filtering sunlight ought to work. I take the main point. Perhaps the professionals have already gone into this?

Very interesting!!

Olly

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


  • Recently Browsing   0 members

    No registered users viewing this page.

×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.