I use registar a lot and I think it's great for registration. Today I tried something new. I got two highres files one in Ha and one RGB and tried to register them. The start field is extremely busy, the shots didn't even align and they were taken with two different scopes, so different image scales. In these two particular files even CCD Inspector couldn't read the starfield for collimation or field curvature data, I assume because it is so dense.
Here's the results. It did a good job in the middle but I was amazed to see the "drop" patterns it generated at the top and botton of the pictures. So it does a lot more than rotating and scaling pictures, Looking at the pattern it seems to me that it's looking at neighbouring stars for each registered star and warps the surrounding accordingly then move on to the next one in an iterative way. That would explain those artifacts and patterns.
What do you think? Groovy alignment hey?
Just checking for second opinions and making sure you see the same thing so I can rule out what I'm drinking right now...
Thats quite a funky modern piece of art! You should frame it and hang it on the wall. I'm sure its not what you are drinking, cause I haven't started yet
Hi Marc. I have to admitt I always considered the best registration tool I had but of late playing with RGB filters and NB filters and a mix of both it has let me down a bit, maybe not quite this graphically but it has struggled none the less.
I have found that an initial alignment in Images plus also leaves a bit wanting but then to run the aligned images through Registar does seem to improve the end result.
CCDIS and CCD Stack seem to suffer a similar problem when carrying out an initial registration of mixed data.
I don't know what the answer is.
Although its fantasmic shot, the field is far too busy and background too high. Itd be making a template to align to, with less stars and the background dumped.
[QUOTE=multiweb;589655] I'm not part of the "photoshopography" retouching mob. I take real pictures /QUOTE]
wha.........oii punk, and whats wrong with photoshopography ?, he, punk . Real, as in noisy, blurry, dull etc nearly real, or real as in crafted partly synthetic more nearly actual nice to look at real? ......................... ..................
Marc have you tried the Noise Compensation settings when you choose register? With dense star fields sometimes it helps to use a version that has had noise reduction only as a starting frame. Then align with the noisy version of itself
Always use the higher resolution image as the reference frame.
Registar is very good at aligning noise. In dense star fields the reference vector set can match up to just about anything.
When aligning HA with colour alot of stars are missing or faint in the HA version so strange local alignments leading to distortions occur. Aligning HA with just the red layer also really helps.
It again shows if you really want to stuff something up a computer will do it better.
It does look a bit like black hole distortions. Are you sure they havent come down the line from the LHC?
Marc you could use the move tool in PS.
Marcus may have a tutorial laying around that you can use.
Quote:
Originally Posted by Bassnut
Quote:
Originally Posted by multiweb
I'm not part of the "photoshopography" retouching mob. I take real pictures
wha.........oii punk, and whats wrong with photoshopography ?, he, punk . Real, as in noisy, blurry, dull etc nearly real, or real as in crafted partly synthetic more nearly actual nice to look at real? ......................... ..................
Yeah, yeah... here comes the picasso crew
Quote:
Originally Posted by avandonk
Marc have you tried the Noise Compensation settings when you choose register? With dense star fields sometimes it helps to use a version that has had noise reduction only as a starting frame. Then align with the noisy version of itself
Always use the higher resolution image as the reference frame.
Registar is very good at aligning noise. In dense star fields the reference vector set can match up to just about anything.
When aligning HA with colour alot of stars are missing or faint in the HA version so strange local alignments leading to distortions occur. Aligning HA with just the red layer also really helps.
It again shows if you really want to stuff something up a computer will do it better.
It does look a bit like black hole distortions. Are you sure they havent come down the line from the LHC?
Bert
Good point Bert. I tried to align Ha onto a RGB shot. I'll try your suggestions. LHC? Nah... I think they're still dancing there.
.
. Real, as in noisy, blurry, dull etc nearly real, or real as in crafted partly synthetic more nearly actual nice to look at real? 
......................... ..................
