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PixInsight => General => Off-topic => Topic started by: Tom OD on 2011 November 12 04:45:08

Title: Gradient Merge Mosaic with RGB frames
Post by: Tom OD on 2011 November 12 04:45:08

Hi Forum,
I've been watching the video showing the Gradient merge mosaic. It works really well on monochrome images. I'm having problems with just 2 frames and RGB images.
Is the best method to split the RGB frmaes into the RGB monochrome frames?
I have a slow laptop and its taking hours and hours to do 2 frame merges. I ran out of memory trying one test. Just wondering if anyone had any advice.
Thanks Tom

Title: Re: Gradient Merge Mosaic with RGB frames
Post by: georg.viehoever on 2011 November 12 10:24:16

Yes, it is kind of memory intense. It does work on RGB frames, but it need more memory than for monochrome ones. The module is not wasteful with memory, but also non particularly written to save it.

You can try to do it with 3 separate monchrome runs. But my advice would be to by more RAM. This will benefit all of your image processing.

Georg

Title: Re: Gradient Merge Mosaic with RGB frames
Post by: zvrastil on 2011 November 12 10:47:51

Hi Tom,

if you're running on 32bit system, you're likely to end with out of memory anyway. On my system, 32bit operating system fails even with two images, while 64bit system on the same computer with same amount of memory succeeds.

regards, Zbynek

Title: Re: Gradient Merge Mosaic with RGB frames
Post by: Tom OD on 2011 November 12 11:32:51

Thanks Guys,
I did upgrade to 2 gigs ofmemory chips, but its still failing for Out Of Memory. It is a 32 bit system. Win Xp on an oldish laptop.
Tom.

Title: Re: Gradient Merge Mosaic with RGB frames
Post by: Raymond on 2011 November 12 14:39:48

Hi;
Unfortunately, I do have the same problem - out of memory - with my Laptop: Win7Prof., I5 2.4 GHz and 3 GB Ram and ... 32-bit system. I do my mosaics the 'old fashioned way' using Star Alignment/Register-Union-Mosaic.

Title: Re: Gradient Merge Mosaic with RGB frames
Post by: Tom OD on 2011 November 12 18:02:22

Just happened to be looking at new laptops today. 2500 euros for a top of the range Mac. Think I'll be doing it the old fashioned way too.
T.

Title: Re: Gradient Merge Mosaic with RGB frames
Post by: georg.viehoever on 2011 November 13 10:24:13

Quote from: Raymond on 2011 November 12 14:39:48

Hi;
Unfortunately, I do have the same problem - out of memory - with my Laptop: Win7Prof., I5 2.4 GHz and 3 GB Ram and ... 32-bit system. I do my mosaics the 'old fashioned way' using Star Alignment/Register-Union-Mosaic.

Raimond,

your laptop is able to run Win7-64bits. If possible, switch to this Windows version, and the memory headaches should be gone.
Georg

Title: Re: Gradient Merge Mosaic with RGB frames
Post by: Lex on 2011 November 13 13:15:56

Oh yeah, the good old problem aka "out of memory" still persists; even nowadays  :yell:
So what to do? Cheapest way is to get a 64bit OEM version and go for more RAM.
Once the RAM is installed the images are processed like a fury.
I think for this kind of work you need at least 4 Gb; better would be 6-8 to keep a good buffer..

Even upgrading to 64 bit and be able to control the 4 Gb already is big difference!

Title: Re: Gradient Merge Mosaic with RGB frames
Post by: Raymond on 2011 November 15 01:24:33

Georg, thanks for the advise. But my next concern will be 'never change a running system'...  :-\
Maybe my next computer .....