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Glenn Becker | 1 Jul 21:37
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Re: questions re: gathering images


Luciano -

I saved this set of instructions of yours from some time ago ...

> which I obtained from the kstars m42 image with these steps:
>
> Convert image to RGB
> Create a mask from a grayscale copy of the image (Layer->Mask->Add Layer Mask)
>> From the layers dialog, select the mask (it should be already selected)
> Adjust color levels, with Tools->Color Tools->Levels
> (I have used the "auto" function to find the minnimum, and set the mask to
> opaque for values above 128, so luminous objects are visible, and the rest of
> the images blends gradually to the background)
> Apply the layer mask from the popup menu in the layers dialog
> Save.

I am trying to apply these steps to the NGC images I have, but there is 
one step I think I am not doing correctly: how do you "set the mask opaque 
for values above 128"? What I have tried is sliding the white arrow (in 
the "Adjust Color Levels" dialogue) in the slider under "Output levels" 
down to 128. This makes the image more diaphanous / transparent, but 
maybe too much so?

I am attaching a sample of what I have wound up with for NGC 5566. If I am 
not interpreting the instructions correctly, let me know (I'm not really 
a graphics guy, I admit - the help is much appreciated) & what I should do 
instead.

Regards,
(Continue reading)

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Luciano Montanaro | 3 Jul 11:15
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Re: questions re: gathering images

Il Sunday 01 July 2007 21:37:45 Glenn Becker ha scritto:
> Luciano -
>
> I saved this set of instructions of yours from some time ago ...
>
> > which I obtained from the kstars m42 image with these steps:
> >
> > Convert image to RGB
> > Create a mask from a grayscale copy of the image (Layer->Mask->Add Layer
> > Mask)
> >
> >> From the layers dialog, select the mask (it should be already selected)
> >
> > Adjust color levels, with Tools->Color Tools->Levels
> > (I have used the "auto" function to find the minnimum, and set the mask
> > to opaque for values above 128, so luminous objects are visible, and the
> > rest of the images blends gradually to the background)
> > Apply the layer mask from the popup menu in the layers dialog
> > Save.
>
> I am trying to apply these steps to the NGC images I have, but there is
> one step I think I am not doing correctly: how do you "set the mask opaque
> for values above 128"? What I have tried is sliding the white arrow (in
> the "Adjust Color Levels" dialogue) in the slider under "Output levels"
> down to 128. This makes the image more diaphanous / transparent, but
> maybe too much so?
>

Ah, ok. I think I worked on the input levels. Actually, I've found you have to 
tweak both ends of the inbput so that your medium gray values for the galaxy
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Glenn Becker | 3 Jul 21:47
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updated image file - H400 test images


Hi all -

I have reprocessed the 19 images in the first group for better (I hope) 
transparency and smooth appearance on the sky map.

Some of them still have problems, I think. The clusters in particular seem 
kind of underwhelming and may need to be completely redone. NGC 40 is 
still perhaps a bit on the opaque side. Nonetheless, I would appreciate 
feedback on whether I am moving in the right direction ...

I also re-named a bunch of the thumbnail images which I had mis-named with 
an underscore. Sorry about that.

The new file is here:

http://burningc.freeshell.org/KStars/reprocessed.tar.bz2

untar and bunzip2 into /usr/share/apps/kstars directory (or the equivalent 
on your system - that is the directory on my Debian box).

Thanks,

Glenn

+-----------------------------------------------------+
Glenn Becker - burningc <at> sdf.lonestar.org
SDF Public Access UNIX System - http://sdf.lonestar.org
+-----------------------------------------------------+
(Continue reading)

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Glenn Becker | 4 Jul 19:53
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Re: updated image file - H400 test images


> I have reprocessed the 19 images in the first group for better (I hope)
> transparency and smooth appearance on the sky map.

finding more problems with these, i will fix as soon as i can and repost 
the file.

learning as i go: apologies. :)

+-----------------------------------------------------+
Glenn Becker - burningc <at> sdf.lonestar.org
SDF Public Access UNIX System - http://sdf.lonestar.org
+-----------------------------------------------------+
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Edward Eastburn | 8 Jul 07:35
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Almost have the Celestron NexImage Working But...

Hello,

I love using the KStars application and showing others that I can easily control my C11 GPS with KStars.  I
have been trying to get my Celestron NexImage working with KStars and this is what I have found to date:

First some important info:

Using PCLinuxOS 2007 using all default settings.
CPU is an AMD Opteron(tm) Processor 846 1.6 GHz
memory is 512 Mb

This web cam DOES work.  I can use it with "Kopete" when it is plugged into my Belkin usb hub (taken pictures of a
house's roof tiles 1/4 mile down the road through the C11).  In the Kopete-Configure menu the web cam is
displayed as an  AME Co. Afina Eye usb.

Checking the /var/log/message file I get the following when the web cam is plugged into my Belkin hub:

Jul  5 14:08:54 localhost kernel: usb 5-7.2: new full speed USB device using ehci_hcd and address 17
Jul  5 14:08:54 localhost kernel: usb 5-7.2: configuration #1 chosen from 1 choice
Jul  5 14:08:56 localhost kernel: pwc: AME Co. Afina Eye USB webcam detected.
Jul  5 14:08:56 localhost kernel: pwc: Registered as /dev/video0.

Now using "Kstars"  I need to tell the program what video port I am using which I thought was /dev/video0
(which is a symbolic link to the file /dev/v4l/video0) but does not work. I always get the message
"08T05:31:08 Error: unable to open device".  I did check the permissions and I do have permission to use
this file and I can execute the file (/dev/v4l/video0).  In fact I cannot access any web cam (Philips ToUCam
or Logitech Express 4000 which did work).  I have tried plugging the cameras directly into the computers
usb slots but i still get the same error message.

I have made sure my usb storage device is unplugged when trying all this.
(Continue reading)

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Jasem Mutlaq | 13 Jul 00:33

Re: Almost have the Celestron NexImage Working But...

Hello Edward,

The rule of the thumb is: if there is a V4L driver for
it, then it should work. What version of KStars are
you using? What do you get when you type:

$ v4l-info 

Please update us and we'll try to help.

Cheers,
Jasem

-- Edward Eastburn <eastburn <at> inbox.com> wrote:

> Hello,
> 
> I love using the KStars application and showing
> others that I can easily control my C11 GPS with
> KStars.  I have been trying to get my Celestron
> NexImage working with KStars and this is what I have
> found to date:
> 
> First some important info:
> 
> Using PCLinuxOS 2007 using all default settings.
> CPU is an AMD Opteron(tm) Processor 846 1.6 GHz
> memory is 512 Mb
> 
> This web cam DOES work.  I can use it with "Kopete"
(Continue reading)

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Glenn Becker | 17 Jul 23:35
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herschel 400 update


Hi all -

I have put an updated tar'd/bzip2'd file of Herschel 400 images here:

http://burningc.freeshell.org/KStars

The filename is processed.tar.bz2. There are I believe 46 inline images 
with corresponding thumbs for the details dialogue.

Please let me know if these are looking "good enough" to merit 
eventual inclusion of the collection as a downloadable add-on. Although 
I've gotten pretty fast at processing these, there are 150-odd more and 
if they just aren't looking good enough I'd rather stop and reconsider 
here rather than later. :^)

As it stands the thing is a hair over 4 megs.

Thanks,

GB

+-----------------------------------------------------+
Glenn Becker - burningc <at> sdf.lonestar.org
SDF Public Access UNIX System - http://sdf.lonestar.org
+-----------------------------------------------------+
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Akarsh Simha | 24 Jul 19:14
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Asteroid Magnitude Bug

Hi
I'm sorry I was away from the scenario for quite some time.

I don't think I as yet have the skill to write an occultations class, so I had better start off with a few more simple bugfixes. Are there any that I can work on?

I've noticed that there's a bug in calculating the magnitudes of asteroids and several asteroids are reported well brighter than Mag 10, while the SB What's Observable site shows only a handful. What is the possible problem? (I had mentioned this earlier here as well)

Thanks.
--
Regards,
     Akarsh
http://www.bas.org.in
http://www.nascent-technologies.com

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James Bowlin | 24 Jul 19:32
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Re: Asteroid Magnitude Bug

Akarsh,

I can't answer you questions but I wanted to let you know that I am
making some substantial changes in the skycomponents/ directory in
order to add a spatial index to make drawing and finding things much
faster.  I've already made some changes to AsteroidComponent.

Jason should be back from his trip to Australia any day now.  I'm
working in a separate branch for now and it will be up to Jason
to decide when/if my changes get applied to the main branch.  If
you could hold off for a few days before making changes in the
skycomponents/ directory, it might help prevent us from stepping on
one another's toes.

--

-- 
Peace, James

On Tue July 24 2007 11:14 am, Akarsh Simha wrote:
> Hi
> I'm sorry I was away from the scenario for quite some time.
>
> I don't think I as yet have the skill to write an occultations class, so
> I had better start off with a few more simple bugfixes. Are there any
> that I can work on?
>
> I've noticed that there's a bug in calculating the magnitudes of
> asteroids and several asteroids are reported well brighter than Mag 10,
> while the SB What's Observable site shows only a handful. What is the
> possible problem? (I had mentioned this earlier here as well)
>
> Thanks.
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Akarsh Simha | 24 Jul 21:52
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Re: Asteroid Magnitude Bug

Hi James

One of the bugs we have with asteroids has to do with the limiting magnitude filter for asteroids. I was just looking at the code trying to figure out how I should go about enforcing a magnitude filter on the find dialog. I realised that at some point of time, we may want to implement a magnitude filter for deepsky objects as well. So, just about every skycomponent should ideally be magnitude filterable.

Since what you are doing looks similar to this I wanted your inputs on this. I think it would be best if we could finally achieve something like a magnitude limit that grows fainter as we zoom in, for then we could include more exhaustive star and object catalogs.

Thanks.

Regards
Akarsh

On 7/25/07, Akarsh Simha <akarshsimha <at> gmail.com> wrote:
Hi James

Thanks for the information. I will hold myself from making any changes to the skycomponents/ directory till you finish.

Regards
Akarsh.


On 7/24/07, James Bowlin <bowlin <at> mindspring.com> wrote:
Akarsh,

I can't answer you questions but I wanted to let you know that I am
making some substantial changes in the skycomponents/ directory in
order to add a spatial index to make drawing and finding things much
faster.  I've already made some changes to AsteroidComponent.

Jason should be back from his trip to Australia any day now.  I'm
working in a separate branch for now and it will be up to Jason
to decide when/if my changes get applied to the main branch.  If
you could hold off for a few days before making changes in the
skycomponents/ directory, it might help prevent us from stepping on
one another's toes.


--
Peace, James



On Tue July 24 2007 11:14 am, Akarsh Simha wrote:
> Hi
> I'm sorry I was away from the scenario for quite some time.
>
> I don't think I as yet have the skill to write an occultations class, so
> I had better start off with a few more simple bugfixes. Are there any
> that I can work on?
>
> I've noticed that there's a bug in calculating the magnitudes of
> asteroids and several asteroids are reported well brighter than Mag 10,
> while the SB What's Observable site shows only a handful. What is the
> possible problem? (I had mentioned this earlier here as well)
>
> Thanks.
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