Re: [Gimp-user] GIMP hints for astrophotography tweaking

2004-12-04 Thread Steve Stavropoulos
On Sat, 4 Dec 2004, Carol Spears wrote:

> > Also could briefly describe how to import multiple images into
> > gimp with the _00X.jpg sequential filenames?
> > 
> i have this problem right now.  to the best of my knowledge, at this
> point there is no way to rename an existing image set like that.
> however, this is the way that images come off from my camera.
> 

 A simple script to do that, provided you have a file containing the name 
of the files in the order you want them, is this:

#!/bin/sh
# Usage: ./script  

for i in $(seq -w 1 $(sed -e '/^$/d' $1 |wc -l | sed -e 's/ *\([^ ][^ ]*\) 
.*/\1/')); do
mv `head -$i $1 | tail -1` $2_$i.jpg
done

The index file should have one filename per line.

 This script was created in 1-2 minutes, with minimal testing. Use with 
care.

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Re: [Gimp-user] GIMP hints for astrophotography tweaking

2004-12-04 Thread Carol Spears
On Sat, Dec 04, 2004 at 06:57:33AM -0500, Mark Bednarczyk wrote:
> I'm fairely novice at this and this is interesting. Is this
> right "GAP = Gimp Animation Package".
> 
close, GIMP Animation Plug-in.  


> Also could briefly describe how to import multiple images into
> gimp with the _00X.jpg sequential filenames?
> 
i have this problem right now.  to the best of my knowledge, at this
point there is no way to rename an existing image set like that.
however, this is the way that images come off from my camera.


> Lastly how would you apply gap to change a property for all the
> layers, 1 expample is probably enough to get me started.
> 
i wrote a tutorial for this.  gap gui is a little different, yet so is
the fact that it works on a bunch of images.

http://carol.gimp.org/gimp/2.1/gap/layers/

carol

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RE: [Gimp-user] GIMP hints for astrophotography tweaking

2004-12-04 Thread Mark Bednarczyk
I'm fairely novice at this and this is interesting. Is this
right "GAP = Gimp Animation Package".

Also could briefly describe how to import multiple images into
gimp with the _00X.jpg sequential filenames?

Lastly how would you apply gap to change a property for all the
layers, 1 expample is probably enough to get me started.

Thanks,
mark...

>-Original Message-
>From: [EMAIL PROTECTED]
>[mailto:[EMAIL PROTECTED]
>Behalf Of Carol
>Spears
>Sent: Saturday, December 04, 2004 2:27 AM
>To: Akkana Peck; GIMPUser
>Subject: Re: [Gimp-user] GIMP hints for
>astrophotography tweaking
>
>
>On Fri, Dec 03, 2004 at 07:08:15PM -0800, Akkana Peck wrote:
>> Robin Laing writes:
>> > One thing that I have read is making multiple
>exposures with digital
>> > cameras and then adding the photos together.
>>
>> I don't know of a gimp plugin to do stacking, but it
>would be fairly
>> trivial to write.  (I'm not really an
>astrophotographer myself and
>> have never stacked more than four images, so I
>didn't look very hard
>> for a plugin, nor bothered to write one.)
>>
>if you have images that are named sequentially (like
>img_0001.jpg
>img_0002.jpg), gap will make them into one single
>image, with each image
>being a different layer.
>
>you could use gap to make the changes to each image,
>like changing the
>transparency before making them into one layer (for
>the viewing).
>
>carol
>
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Re: [Gimp-user] GIMP hints for astrophotography tweaking

2004-12-03 Thread Carol Spears
On Fri, Dec 03, 2004 at 07:08:15PM -0800, Akkana Peck wrote:
> Robin Laing writes:
> > One thing that I have read is making multiple exposures with digital 
> > cameras and then adding the photos together.
> 
> I don't know of a gimp plugin to do stacking, but it would be fairly
> trivial to write.  (I'm not really an astrophotographer myself and
> have never stacked more than four images, so I didn't look very hard
> for a plugin, nor bothered to write one.)
> 
if you have images that are named sequentially (like img_0001.jpg
img_0002.jpg), gap will make them into one single image, with each image
being a different layer. 

you could use gap to make the changes to each image, like changing the
transparency before making them into one layer (for the viewing).

carol

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Re: [Gimp-user] GIMP hints for astrophotography tweaking

2004-12-03 Thread Akkana Peck
Robin Laing writes:
> One thing that I have read is making multiple exposures with digital 
> cameras and then adding the photos together.

One common operation is "stacking": as you add layer N to the image,
make the layer mask's transparency be 1/N.  So the first layer is
the background at 100%, the next layer goes in at 50%, the next at
33%, etc.  This enhances the contrast of a bunch of short exposures
without enhancing the noise much; it apparently also sharpens
lunar/planetary images, by reducing the effect of temporary bad
seeing in one part of the image.

I don't know of a gimp plugin to do stacking, but it would be fairly
trivial to write.  (I'm not really an astrophotographer myself and
have never stacked more than four images, so I didn't look very hard
for a plugin, nor bothered to write one.)

Of course, you have to make sure all the images are accurately
aligned (easy if you have pinpoint stars, not so easy if you're
shooting something with soft edges like Jupiter).  2.2's transform
tool previews should make this important part a LOT easier.  

It would be a bit easier still if there were a way to alternate
between rotation (transform tool) and translation (the move tool)
while previewing without having to actually do the rotation (there's
presumably a quality loss every time you free-rotate an image) but
the only way I've found is to remember the rotation amount in the
transform tool, cancel, select the move tool, move the layer, then
transform again and type in the rotation where you left off.  That
comes up a lot with panoramas, too.  Anyone know a better way to
combine rotation and translation?

Though with a real astrophotography CCD and a rock solid mount
you may not need any rotation/translation.

...Akkana
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Re: [Gimp-user] GIMP hints for astrophotography tweaking

2004-12-03 Thread Robin Laing
Mark Bednarczyk wrote:
I would like to use GIMP to tweak astrophotography images. These are 
usually faint images of DSO (Deep Space Objects). Anyone have links to a 
tutorial or hints. I'm sure someone has done something with GIMP and 
astrophotography.
 
Thanks,
mark...
Look for any post processing tips.  Most can be done in GIMP.  I will 
say it will be nicer when GIMP supports deeper color depths.

One thing that I have read is making multiple exposures with digital 
cameras and then adding the photos together.

I am just about to get into astro photography as well.
--
Robin Laing
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[Gimp-user] GIMP hints for astrophotography tweaking

2004-12-03 Thread Mark Bednarczyk



I would like to use 
GIMP to tweak astrophotography images. These are usually faint images of DSO 
(Deep Space Objects). Anyone have links to a tutorial or hints. I'm sure someone 
has done something with GIMP and astrophotography.
 
Thanks,
mark...