Re: [MaxImDL] Re: processing times - DSLR images


Oct 25, 2005

 


----------------------------

#21183 Oct 25, 2005

I had a question about the amount of time it takes to combine DSLR

images. I haven't shot any night sky RAW's yet, but I was testing it

out with two daylight RAW images taken with a Nikon D70. When I tried

combining the two images (using the File menu combine option - neither

images was open at the time) it took 11 minutes to create the newly

combined image. And that was with the alignment function turned *off*.



Is that normal? Everything went much faster before I converted the

RAW's to RGB. Can I align and stack the images first in black and

white, then convert the resulting image to color? Or will that not work

with the color embedded matrix of the RAW format.



My ST-8 files are aligned/combined very fast, but then again they're

black and white and have much fewer pixels...



My laptop is relatively slow - running XP on a HP Celeron 1.6ghz with

192 MB ram...Do I just have to get used to this?



Thanks!

-Ken



----------------------------

#21186 Oct 25, 2005

ksablin wrote: >

> I had a question about the amount of time it takes to combine DSLR

> images. I haven't shot any night sky RAW's yet, but I was testing it

> out with two daylight RAW images taken with a Nikon D70. When I tried

> combining the two images (using the File menu combine option - neither

> images was open at the time) it took 11 minutes to create the newly

> combined image. And that was with the alignment function turned *off*.

>

> Is that normal? Everything went much faster before I converted the

> RAW's to RGB. Can I align and stack the images first in black and

> white, then convert the resulting image to color? Or will that not work

> with the color embedded matrix of the RAW format.

>

> My ST-8 files are aligned/combined very fast, but then again they're

> black and white and have much fewer pixels...

>

> My laptop is relatively slow - running XP on a HP Celeron 1.6ghz with

> 192 MB ram...Do I just have to get used to this?



You really want to have more RAM when processing DSLR images. We recommend at

least 512MB.



Doug



---------------



Doug George

dgeorge@...



Diffraction Limited

Makers of Cyanogen Imaging Products

www.cyanogen.com



25 Conover Street

Ottawa, Ontario,

Canada, K2G 4C3



Phone: (613) 225-2732

Fax: (613) 225-9688



---------------



----------------------------

#21193 Oct 25, 2005

Hmmm. I doubt 192mb is enough for winXP alone!



Do this..



- right click on task bar.

- select "task manager".



(this window is set to 'stay on top' of other windows by default.)



This window will show you how much memory is being used.

If the pagefile usage graph is grows to larger than your real

memory, then windows using the pagefile for swapping data

in and out of real memory, which just slows everything down.

Ideally, you want to have everything in real memory.



With this window open, run some image combine, align, etc.

E.g. process some images. You'll see how much memory gets

used for these operations.



Dunno for sure, but I suspect 512mb is _minimum_, and 1GB is preferred.

With maxim-dl, I noticed that the 1ghz/512mb machine was

pretty much swamped. maxdslr was much less demanding.

--- In MaxImDL@yahoogroups.com, "Douglas B. George" dgeorge@c...> wrote:

>

> ksablin wrote:

> > My laptop is relatively slow - running XP on a HP Celeron 1.6ghz with

> > 192 MB ram...Do I just have to get used to this?

>

> You really want to have more RAM when processing DSLR images. We

recommend at

> least 512MB.

>

> Doug



----------------------------

#21207 Oct 26, 2005

--- In MaxImDL@yahoogroups.com, "jeff_crilly" ne14mx@s...> wrote: >

>

> Hmmm. I doubt 192mb is enough for winXP alone!





Hi Jeff, thanks for the tip - I'll give that a try. I was so used to

processing "small" ST-8 images, I guess I got used to the fact that I

didn't have much RAM. Time for an upgrade...



-Ken

>

> Do this..

>

> - right click on task bar.

> - select "task manager".

>

> (this window is set to 'stay on top' of other windows by default.)

>

> This window will show you how much memory is being used.

> If the pagefile usage graph is grows to larger than your real

> memory, then windows using the pagefile for swapping data

> in and out of real memory, which just slows everything down.

> Ideally, you want to have everything in real memory.

>

> With this window open, run some image combine, align, etc.

> E.g. process some images. You'll see how much memory gets

> used for these operations.

>

> Dunno for sure, but I suspect 512mb is _minimum_, and 1GB is

preferred. > With maxim-dl, I noticed that the 1ghz/512mb machine was

> pretty much swamped. maxdslr was much less demanding.

>

> --- In MaxImDL@yahoogroups.com, "Douglas B. George" dgeorge@c...>

wrote: > >

> > ksablin wrote:

> > > My laptop is relatively slow - running XP on a HP Celeron

1.6ghz with > > > 192 MB ram...Do I just have to get used to this?

> >

> > You really want to have more RAM when processing DSLR images. We

> recommend at

> > least 512MB.

> >

> > Doug

>







----------------------------

#21208 Oct 26, 2005

Just as a data point, the below is not absolutely true. It is possible

to have stuff sitting in swap that is never referenced. Other than the

initial swap out to disk, there is no overhead for this. You run into

problems when you are accessing memory that exists on swap, have to swap

something out, then need it in memory. This causes a process called

"thrashing". If you've ever heard your hard drive during a thrash,

you'll know why.



Add to that the incredible inefficiency of the IDE bus and it can be a

bad situation.



More memory never hurts and has a pretty good chance of helping.

>>

>>This window will show you how much memory is being used.

>>If the pagefile usage graph is grows to larger than your real

>>memory, then windows using the pagefile for swapping data

>>in and out of real memory, which just slows everything down.

>>Ideally, you want to have everything in real memory.

>>

>>



----------------------------

#21230 Oct 26, 2005

Consider 1.5Gb, and 3.6GHz cpu with 7200 rpm disks. If your stacking 10-12 images it makes a difference. ----- Original Message -----

From: jeff_crillymailto:ne14mx@...>

To: MaxImDL@yahoogroups.commailto:MaxImDL@yahoogroups.com>

Sent: Tuesday, October 25, 2005 11:41 PM

Subject: [MaxImDL] Re: processing times - DSLR images







Hmmm. I doubt 192mb is enough for winXP alone!



Do this..



- right click on task bar.

- select "task manager".



(this window is set to 'stay on top' of other windows by default.)



This window will show you how much memory is being used.

If the pagefile usage graph is grows to larger than your real

memory, then windows using the pagefile for swapping data

in and out of real memory, which just slows everything down.

Ideally, you want to have everything in real memory.



With this window open, run some image combine, align, etc.

E.g. process some images. You'll see how much memory gets

used for these operations.



Dunno for sure, but I suspect 512mb is _minimum_, and 1GB is preferred.

With maxim-dl, I noticed that the 1ghz/512mb machine was

pretty much swamped. maxdslr was much less demanding.



--- In MaxImDL@yahoogroups.com, "Douglas B. George" dgeorge@c...> wrote:

>

> ksablin wrote:

> > My laptop is relatively slow - running XP on a HP Celeron 1.6ghz with

> > 192 MB ram...Do I just have to get used to this?

>

> You really want to have more RAM when processing DSLR images. We

recommend at

> least 512MB.

>

> Doug













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