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List: kstars-devel
Subject: Re: NGC Thumbnails
From: Jasem Mutlaq <mutlaqja () ikarustech ! com>
Date: 2017-04-20 8:31:38
Message-ID: CAE0bU5=Z_Bg-8B3mn8rmRWYkeFAG8LZhXRnvm7RQ8ZHzbHAz7g () mail ! gmail ! com
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Hi John,
The RGB ones have a few nice images, but most images have a lot of
artifacts, so I think it's better to stay with your initial monochrome
version for now. Thanks for the awesome contribution John! I think it is
great as it is now.
Regards,
Jasem
On Wed, Apr 19, 2017 at 7:25 PM, John S. <myxlflik@hotmail.com> wrote:
> All,
>
>
> I tweaked the settings as much as I could and I did a run of the NGC
> objects to see how many of them came out usable. I used data from the
> DSS1R for RED, DSS for GREEN and DSS1B for BLUE. I used the same sizing
> parameters for the original monochrome pulls.
>
>
> I am attaching a link to the onedrive shared file for you guys to pull and
> review:
>
> https://1drv.ms/u/s!AnSnRFrNRtfXviM4XnBnN9neLucR
>
>
> You will probably notice quite a few of the images have a yellow or green
> overall appearance. I am not 100% sure if that is because of missing data
> or the histeq method I chose this time. Probably a bit of both.
>
> Some of the images appear to be quite usable like the attached NGC1432 and
> NGC2024. That being said, many of the objects came out like NGC10, NGC40
> and NGC56. There are also ones that have significant source data issues
> like NGC101.
>
>
> My question to the group is this, Do we feel there is enough good picture
> data like 1432 and 2024 to warrant the time and effort to comb through the
> 7840 objects to get the color objects out and include them in the mix.
> Once we identify the 'good' data images, I have to rename and convert them
> to PNG for inclusion. I would also intend to split up the excel
> spreadsheet so that the ones we deemed worthy would be pulled in RGB if we
> ever needed to pull them again. The remaining black and white images would
> be either candidates for further experimentation to get the color data
> right in them or they would be left as monochrome in the thumbnails
> collection.
>
>
> Please weigh in on this and also let me know if you would be willing to QA
> these images and give me a listing of the good ones you find. This is a
> fairly time consuming effort and I would like some help as well as guidance
> on what others feel are decent images or not.
>
>
> John
>
>
>
> ------------------------------
> *From:* John S. <myxlflik@hotmail.com>
> *Sent:* Tuesday, April 18, 2017 3:01 PM
>
> *To:* Jasem Mutlaq; KStars Development Mailing List
> *Subject:* Re: NGC Thumbnails
>
>
> Jasem,
>
>
> You can use my last name (Sadler) for the credit on the packages. I
> played around with the data some more and have gotten a few images to come
> out acceptably, but most of completely out of balance when you convert them
> to RGB. I think I found out why. One of my underlying assumptions about
> the DSS data appears to be incorrect. Although the original DSS survey is
> monochrome, it does not appear to be filtered. It appears to be visible
> light. Obviously when you assign full spectrum to one channel it's going
> to play all kinds of havok with the balance of the channels. I am not
> certain if there is a practical way to deal with the data, but perhaps a
> 'green' channel can be extracted by subtracting the red and blue channels
> from the DSS green channel. This all would require significant effort but
> may yield results and be worthwhile if we can find a way to do it in a
> batch manner. I can certainly pull all three channels separately and start
> playing to see if I get any kind of real results. I will let you know what
> I find out.
>
>
> John
>
>
> ------------------------------
> *From:* John S. <myxlflik@hotmail.com>
> *Sent:* Tuesday, April 18, 2017 9:27 AM
> *To:* Jasem Mutlaq; KStars Development Mailing List
> *Subject:* Re: NGC Thumbnails
>
>
> Great. I am continuing to tweak and play with settings on the object
> pulls to see if I can get better data. The problem I think is that they
> don't have a setting to adjust the levels and it seems like the blue
> channel is too weak overall to make for a proper color balance. The last
> thing I want to do here is manually adjust 13000 images. Even with a batch
> process it feels like a lot of effort. I will keep you posted as to what I
> find. I will start 'versioning' the tarball files as I change them so that
> you will know if it's newer than what you have now.
>
>
> ------------------------------
> *From:* Kstars-devel <kstars-devel-bounces@kde.org> on behalf of Jasem
> Mutlaq <mutlaqja@ikarustech.com>
> *Sent:* Tuesday, April 18, 2017 8:13 AM
> *To:* KStars Development Mailing List
> *Subject:* Re: NGC Thumbnails
>
> Yup we can publish an updated version if we get better data
>
> On Tue, Apr 18, 2017 at 2:59 PM, John S. <myxlflik@hotmail.com> wrote:
>
>> Oh wow. I thought you wanted to try to work on them some more. Assuming
>> we can get better images for this, what will the process be to update this
>> now that it is incorporated? Just publish a new version and have them
>> download it via that data downloads in Kstars?
>>
>>
>> ------------------------------
>> *From:* Jasem Mutlaq <mutlaqja@ikarustech.com>
>> *Sent:* Tuesday, April 18, 2017 4:38 AM
>> *To:* John S.
>> *Cc:* Hans; KStars Development Mailing List
>> *Subject:* Re: NGC Thumbnails
>>
>> I just added them to KStars. I used your name "John S." and email
>> address. Please let me know if you want to change any of those as they
>> appear in the download dialog. I'll try to add previews as well since we do
>> not have previews for _any_ download before.
>>
>> On Mon, Apr 17, 2017 at 7:44 PM, John S. <myxlflik@hotmail.com> wrote:
>>
>>> Did anyone have any further input on this? Is it worth pursuing and
>>> adding to Kstars?
>>>
>>>
>>>
>>> ------------------------------
>>> *From:* John S. <myxlflik@hotmail.com>
>>> *Sent:* Saturday, April 15, 2017 11:00 AM
>>>
>>> *To:* Hans
>>> *Cc:* KStars Development Mailing List
>>> *Subject:* Re: NGC Thumbnails
>>>
>>>
>>> Here is a link to the current NGC file tarball and the rudimentary
>>> install and removal scripts. This has only been tested on Linux Mint, but
>>> suspect it will be fine on all versions:
>>>
>>> https://1drv.ms/u/s!AnSnRFrNRtfXviEYxBIM2pNlmuc6
>>>
>>>
>>> Here is a link to the current IC file tarball. Same caveats as the NGC
>>> file:
>>>
>>> https://1drv.ms/u/s!AnSnRFrNRtfXviLmrzlp6Ru6N7KZ
>>>
>>> The images are all of the DSS2R (Red Plate) survey only. There is an
>>> ability to pull data into RGB using the DSS2R, DSS and DSS2B surveys (or
>>> really any other combination for that matter). I have found that in nearly
>>> all cases, the colors needed subsequent adjustment in order to make the
>>> images look palatable. I honestly felt the red channel ones and gray scale
>>> worked out just find overall. I know there are some outright bad images in
>>> there and I haven't had the time or inclination to weed through the 13,000
>>> objects I pulled to clean it up as of yet. I can certainly do it, but it
>>> would largely depend on how strongly this group felt about it's inclusion.
>>> I agree it should be an add-on package and not part of the base install.
>>> We will need to make sure to credit the sources of the images as well.
>>>
>>>
>>> One thing we may need to consider is directory management. Downloading
>>> all of these images puts 13,000+ files in the $HOME/.local/share/kstars
>>> directory. That's a pretty good chunk of files for a single directory. I
>>> may make sense to compile these into some sort of database file or put them
>>> in a directory structure. I am not a developer though and have NO skill
>>> when it comes to that aspect of this project.
>>>
>>>
>>> John
>>> ------------------------------
>>> *From:* John S. <myxlflik@hotmail.com>
>>> *Sent:* Saturday, April 15, 2017 10:15 AM
>>> *To:* Hans
>>> *Cc:* KStars Development Mailing List
>>> *Subject:* Re: NGC Thumbnails
>>>
>>> I started this project for my own personal gratification. I personally
>>> don't mind that some of the objects are subpar quality. Most of those
>>> objects are very interesting to me anyway. However, I would like to make
>>> sure that it meets certain quality levels. I am open to input for how to
>>> rectify the situation. I believe the limits of the survey itself will limit
>>> the outlet quality though. If you want I'll post the links to the two
>>> tarballs for the NGC and IC objects and you can download them a try for
>>> yourself.
>>>
>>> John
>>>
>>> > On Apr 15, 2017, at 9:02 AM, Hans <hans@lambermont.dyndns.org> wrote:
>>> >
>>> > Agreed, this is something very nice to have. And it is tedious work
>>> too. For
>>> > images that don't look too good I expect we'll even get negative
>>> remarks, but
>>> > that should not inhibit this project. To me having a skimpy image is
>>> far better
>>> > than no image at all.
>>> >
>>> > Is the idea to have an image library or to dynamically download them
>>> on demand ?
>>> >
>>> > -- Hans
>>> >
>>> > Jasem Mutlaq wrote on 20170415:
>>> >
>>> >> I'm attaching a few examples so you can see why we can't use them as
>>> is in
>>> >> KStars.
>>> >>
>>> >>> On Sat, Apr 15, 2017 at 9:43 AM, Akarsh Simha <akarshsimha@gmail.com>
>>> wrote:
>>> >>>
>>> >>> Hi
>>> >>>
>>> >>> This is something very nice to have!
>>> >>>
>>> >>> A caveat to consider is the licensing for DSS imagery. They are not
>>> >>> available for commercial use, so we must ship this as an add-on
>>> through
>>> >>> KNewStuff ("Get New Data")
>>> >>>
>>> >>> Other sources of images are SDSS, the Hubble Legacy Archive (
>>> hla.stsci.edu)
>>> >>> and the recently released PanStarrs 1 survey. I think the PanStarrs 1
>>> >>> survey has a large sky coverage (possibly even all sky -- I haven't
>>> >>> checked). SDSS has a somewhat small footprint, and the Hubble only
>>> has
>>> >>> objects of interest.
>>> >>>
>>> >>> I didn't quite get what the problem involved is. The DSS is made from
>>> >>> digitizing scanned plates mostly from the Palomar Observatory and
>>> UKSTU
>>> >>> telescope. The result is that many plates have artefacts, and they
>>> are
>>> >>> completely uncalibrated. Planetary nebulae and bright emission
>>> nebulae tend
>>> >>> to be overexposed. There is no way around these problems other than
>>> going
>>> >>> to other surveys.
>>> >>>
>>> >>> Regards
>>> >>> Akarsh
>>> >>>
>>> >>>
>>> >>
>>> >>
>>> >> --
>>> >> Best Regards,
>>> >> Jasem Mutlaq
>>> >
>>> >
>>> >
>>> >
>>> >
>>>
>>
>>
>>
>> --
>> Best Regards,
>> Jasem Mutlaq
>>
>>
>
>
> --
> Best Regards,
> Jasem Mutlaq
>
>
--
Best Regards,
Jasem Mutlaq
[Attachment #3 (text/html)]
<div dir="ltr">Hi John,<div><br></div><div>The RGB ones have a few nice images, but most images have a \
lot of artifacts, so I think it's better to stay with your initial monochrome version for now. Thanks \
for the awesome contribution John! I think it is great as it is \
now.</div><div><br></div><div>Regards,</div><div>Jasem</div><div><br></div></div><div \
class="gmail_extra"><br><div class="gmail_quote">On Wed, Apr 19, 2017 at 7:25 PM, John S. <span \
dir="ltr"><<a href="mailto:myxlflik@hotmail.com" target="_blank">myxlflik@hotmail.com</a>></span> \
wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc \
solid;padding-left:1ex">
<div dir="ltr">
<div id="m_-8417383449373530433divtagdefaultwrapper" \
style="font-size:12pt;color:#000000;font-family:Calibri,Arial,Helvetica,sans-serif" dir="ltr"> \
<p>All,</p> <p><br>
</p>
<p>I tweaked the settings as much as I could and I did a run of the NGC objects to see how many of them \
came out usable. I used data from the DSS1R for RED, DSS for GREEN and DSS1B for BLUE. I used the \
same sizing parameters for the original monochrome pulls.</p> <p><br>
</p>
<p>I am attaching a link to the onedrive shared file for you guys to pull and review:</p>
<p><a href="https://1drv.ms/u/s!AnSnRFrNRtfXviM4XnBnN9neLucR" class="m_-8417383449373530433OWAAutoLink" \
id="m_-8417383449373530433LPlnk668328|2:odcLink" \
target="_blank">https://1drv.ms/u/s!<wbr>AnSnRFrNRtfXviM4XnBnN9neLucR</a></p> <p><br>
</p>
<p>You will probably notice quite a few of the images have a yellow or green overall appearance. I am \
not 100% sure if that is because of missing data or the histeq method I chose this time. Probably a bit \
of both. <br> </p>
<br>
<p>Some of the images appear to be quite usable like the attached NGC1432 and NGC2024. That being said, \
many of the objects came out like NGC10, NGC40 and NGC56. There are also ones that have significant \
source data issues like NGC101.</p> <p><br>
</p>
<p>My question to the group is this, Do we feel there is enough good picture data like 1432 and 2024 to \
warrant the time and effort to comb through the 7840 objects to get the color objects out and include \
them in the mix. Once we identify the 'good' data images, I have to rename and convert them to \
PNG for inclusion. I would also intend to split up the excel spreadsheet so that the ones we deemed \
worthy would be pulled in RGB if we ever needed to pull them again. The remaining black and white \
images would be either candidates for further experimentation to get the color data right in them or \
they would be left as monochrome in the thumbnails collection.</p> <p><br>
</p>
<p>Please weigh in on this and also let me know if you would be willing to QA these images and give me a \
listing of the good ones you find. This is a fairly time consuming effort and I would like some help as \
well as guidance on what others feel are decent images or not.</p><span class="HOEnZb"><font \
color="#888888"> <p><br>
</p>
<p>John<br>
</p>
</font></span><div class="hm HOEnZb"><p><br>
</p>
<br>
</div><div style="color:rgb(0,0,0)"><div class="hm HOEnZb">
<hr style="display:inline-block;width:98%">
</div><div id="m_-8417383449373530433divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, \
sans-serif" color="#000000"><div class="hm HOEnZb"><b>From:</b> John S. <<a \
href="mailto:myxlflik@hotmail.com" target="_blank">myxlflik@hotmail.com</a>><br> <b>Sent:</b> Tuesday, \
April 18, 2017 3:01 PM</div><div><div class="h5"><br> <b>To:</b> Jasem Mutlaq; KStars Development Mailing \
List<br> <b>Subject:</b> Re: NGC Thumbnails</div></div></font>
<div> </div>
</div><div><div class="h5">
<div>
<div id="m_-8417383449373530433divtagdefaultwrapper" dir="ltr" \
style="font-size:12pt;color:#000000;font-family:Calibri,Arial,Helvetica,sans-serif"> <p>Jasem,</p>
<p><br>
</p>
<p>You can use my last name (Sadler) for the credit on the packages. I played around with the data some \
more and have gotten a few images to come out acceptably, but most of completely out of balance when you \
convert them to RGB. I think I found out why. One of my underlying assumptions about the DSS data \
appears to be incorrect. Although the original DSS survey is monochrome, it does not appear to be \
filtered. It appears to be visible light. Obviously when you assign full spectrum to one channel \
it's going to play all kinds of havok with the balance of the channels. I am not certain if there \
is a practical way to deal with the data, but perhaps a 'green' channel can be extracted by \
subtracting the red and blue channels from the DSS green channel. This all would require significant \
effort but may yield results and be worthwhile if we can find a way to do it in a batch manner. I can \
certainly pull all three channels separately and start playing to see if I get any kind of real results. \
I will let you know what I find out.</p>
<p><br>
</p>
<p>John<br>
</p>
<br>
<br>
<div style="color:rgb(0,0,0)">
<hr style="display:inline-block;width:98%">
<div id="m_-8417383449373530433divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, \
sans-serif" color="#000000"><b>From:</b> John S. <<a href="mailto:myxlflik@hotmail.com" \
target="_blank">myxlflik@hotmail.com</a>><br> <b>Sent:</b> Tuesday, April 18, 2017 9:27 AM<br>
<b>To:</b> Jasem Mutlaq; KStars Development Mailing List<br>
<b>Subject:</b> Re: NGC Thumbnails</font>
<div> </div>
</div>
<div>
<div id="m_-8417383449373530433divtagdefaultwrapper" dir="ltr" \
style="font-size:12pt;color:#000000;font-family:Calibri,Arial,Helvetica,sans-serif"> <p>Great. I am \
continuing to tweak and play with settings on the object pulls to see if I can get better data. The \
problem I think is that they don't have a setting to adjust the levels and it seems like the blue \
channel is too weak overall to make for a proper color balance. The last thing I want to do here is \
manually adjust 13000 images. Even with a batch process it feels like a lot of effort. I will keep \
you posted as to what I find. I will start 'versioning' the tarball files as I change them so \
that you will know if it's newer than what you have now.<br>
</p>
<br>
<br>
<div style="color:rgb(0,0,0)">
<hr style="display:inline-block;width:98%">
<div id="m_-8417383449373530433divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, \
sans-serif" color="#000000"><b>From:</b> Kstars-devel <<a href="mailto:kstars-devel-bounces@kde.org" \
target="_blank">kstars-devel-bounces@kde.org</a>> on behalf of Jasem Mutlaq <<a \
href="mailto:mutlaqja@ikarustech.com" target="_blank">mutlaqja@ikarustech.com</a>><br> <b>Sent:</b> \
Tuesday, April 18, 2017 8:13 AM<br> <b>To:</b> KStars Development Mailing List<br>
<b>Subject:</b> Re: NGC Thumbnails</font>
<div> </div>
</div>
<div>
<div dir="ltr">Yup we can publish an updated version if we get better data</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Tue, Apr 18, 2017 at 2:59 PM, John S. <span dir="ltr">
<<a href="mailto:myxlflik@hotmail.com" target="_blank">myxlflik@hotmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">
<div id="m_-8417383449373530433m_7160945877431352804divtagdefaultwrapper" dir="ltr" \
style="font-size:12pt;color:#000000;font-family:Calibri,Arial,Helvetica,sans-serif"> <p>Oh wow. I \
thought you wanted to try to work on them some more. Assuming we can get better images for this, what \
will the process be to update this now that it is incorporated? Just publish a new version and have \
them download it via that data downloads in Kstars?<br>
</p>
<br>
<br>
<div style="color:rgb(0,0,0)">
<hr style="display:inline-block;width:98%">
<div id="m_-8417383449373530433m_7160945877431352804divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" \
face="Calibri, sans-serif" color="#000000"><b>From:</b> Jasem Mutlaq <<a \
href="mailto:mutlaqja@ikarustech.com" target="_blank">mutlaqja@ikarustech.com</a>><br> <b>Sent:</b> \
Tuesday, April 18, 2017 4:38 AM<br> <b>To:</b> John S.<br>
<b>Cc:</b> Hans; KStars Development Mailing List<br>
<b>Subject:</b> Re: NGC Thumbnails</font>
<div> </div>
</div>
<div>
<div class="m_-8417383449373530433h5">
<div>
<div dir="ltr">I just added them to KStars. I used your name "John S." and email address. \
Please let me know if you want to change any of those as they appear in the download dialog. I'll try \
to add previews as well since we do not have previews for _any_ download before.</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Mon, Apr 17, 2017 at 7:44 PM, John S. <span dir="ltr">
<<a href="mailto:myxlflik@hotmail.com" target="_blank">myxlflik@hotmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">
<div id="m_-8417383449373530433m_7160945877431352804m_7936534728735227365divtagdefaultwrapper" dir="ltr" \
style="font-size:12pt;color:#000000;font-family:Calibri,Arial,Helvetica,sans-serif"> <p>Did anyone have \
any further input on this? Is it worth pursuing and adding to Kstars?<br> </p>
<div class="m_-8417383449373530433m_7160945877431352804hm \
m_-8417383449373530433m_7160945877431352804HOEnZb"></div> <p></p>
<div class="m_-8417383449373530433m_7160945877431352804hm \
m_-8417383449373530433m_7160945877431352804HOEnZb"><br> <br>
</div>
<div style="color:rgb(0,0,0)">
<div class="m_-8417383449373530433m_7160945877431352804hm \
m_-8417383449373530433m_7160945877431352804HOEnZb"> <hr style="display:inline-block;width:98%">
</div>
<div id="m_-8417383449373530433m_7160945877431352804m_7936534728735227365divRplyFwdMsg" dir="ltr"><font \
style="font-size:11pt" face="Calibri, sans-serif" color="#000000"> <div \
class="m_-8417383449373530433m_7160945877431352804hm \
m_-8417383449373530433m_7160945877431352804HOEnZb"><b>From:</b> John S. <<a \
href="mailto:myxlflik@hotmail.com" target="_blank">myxlflik@hotmail.com</a>><br> <b>Sent:</b> \
Saturday, April 15, 2017 11:00 AM</div> <div>
<div class="m_-8417383449373530433m_7160945877431352804h5"><br>
<b>To:</b> Hans<br>
<b>Cc:</b> KStars Development Mailing List<br>
<b>Subject:</b> Re: NGC Thumbnails</div>
</div>
</font>
<div> </div>
</div>
<div>
<div class="m_-8417383449373530433m_7160945877431352804h5">
<div>
<div id="m_-8417383449373530433m_7160945877431352804m_7936534728735227365divtagdefaultwrapper" dir="ltr" \
style="font-size:12pt;color:#000000;font-family:Calibri,Arial,Helvetica,sans-serif"> <p>Here is a link to \
the current NGC file tarball and the rudimentary install and removal scripts. This has only been tested \
on Linux Mint, but suspect it will be fine on all versions:</p> <p><a \
href="https://1drv.ms/u/s!AnSnRFrNRtfXviEYxBIM2pNlmuc6" \
class="m_-8417383449373530433m_7160945877431352804m_7936534728735227365OWAAutoLink" \
id="m_-8417383449373530433m_7160945877431352804m_7936534728735227365LPlnk121453|2:odcLink" \
target="_blank">https://1drv.ms/u/s!AnSnRFrNRt<wbr>fXviEYxBIM2pNlmuc6</a></p> <p><br>
</p>
<p>Here is a link to the current IC file tarball. Same caveats as the NGC file:</p>
<p><a href="https://1drv.ms/u/s!AnSnRFrNRtfXviLmrzlp6Ru6N7KZ" \
class="m_-8417383449373530433m_7160945877431352804m_7936534728735227365OWAAutoLink" \
id="m_-8417383449373530433m_7160945877431352804m_7936534728735227365LPlnk131504|2:odcLink" \
target="_blank">https://1drv.ms/u/s!AnSnRFrNRt<wbr>fXviLmrzlp6Ru6N7KZ</a><br> </p>
<br>
<p>The images are all of the DSS2R (Red Plate) survey only. There is an ability to pull data into RGB \
using the DSS2R, DSS and DSS2B surveys (or really any other combination for that matter). I have found \
that in nearly all cases, the colors needed subsequent adjustment in order to make the images look \
palatable. I honestly felt the red channel ones and gray scale worked out just find overall. I know \
there are some outright bad images in there and I haven't had the time or inclination to weed through \
the 13,000 objects I pulled to clean it up as of yet. I can certainly do it, but it would largely \
depend on how strongly this group felt about it's inclusion. I agree it should be an add-on package \
and not part of the base install. We will need to make sure to credit the sources of the images as \
well.</p> <p><br>
</p>
<p>One thing we may need to consider is directory management. Downloading all of these images puts \
13,000+ files in the $HOME/.local/share/kstars directory. That's a pretty good chunk of files for a \
single directory. I may make sense to compile these into some sort of database file or put them in a \
directory structure. I am not a developer though and have NO skill when it comes to that aspect of this \
project.</p> <p><br>
</p>
<p>John<br>
</p>
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<div id="m_-8417383449373530433m_7160945877431352804m_7936534728735227365x_divRplyFwdMsg" dir="ltr"><font \
style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>From:</b> John S. <<a \
href="mailto:myxlflik@hotmail.com" target="_blank">myxlflik@hotmail.com</a>><br> <b>Sent:</b> \
Saturday, April 15, 2017 10:15 AM<br> <b>To:</b> Hans<br>
<b>Cc:</b> KStars Development Mailing List<br>
<b>Subject:</b> Re: NGC Thumbnails</font>
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<div class="m_-8417383449373530433m_7160945877431352804m_7936534728735227365PlainText">I started this \
project for my own personal gratification. I personally don't mind that some of the objects are \
subpar quality. Most of those objects are very interesting to me anyway. However, I would like to make \
sure that it meets certain quality levels. I am open to input for how to rectify the situation. I believe \
the limits of the survey itself will limit the outlet quality though. If you want I'll post the links \
to the two tarballs for the NGC and IC objects and you can download them a try for yourself.<br>
<br>
John<br>
<br>
> On Apr 15, 2017, at 9:02 AM, Hans <<a href="mailto:hans@lambermont.dyndns.org" \
target="_blank">hans@lambermont.dyndns.org</a>> wrote:<br> > <br>
> Agreed, this is something very nice to have. And it is tedious work too. For<br>
> images that don't look too good I expect we'll even get negative remarks, but<br>
> that should not inhibit this project. To me having a skimpy image is far better<br>
> than no image at all.<br>
> <br>
> Is the idea to have an image library or to dynamically download them on demand ?<br>
> <br>
> -- Hans<br>
> <br>
> Jasem Mutlaq wrote on 20170415:<br>
> <br>
>> I'm attaching a few examples so you can see why we can't use them as is in<br>
>> KStars.<br>
>> <br>
>>> On Sat, Apr 15, 2017 at 9:43 AM, Akarsh Simha <<a href="mailto:akarshsimha@gmail.com" \
target="_blank">akarshsimha@gmail.com</a>> wrote:<br> >>> <br>
>>> Hi<br>
>>> <br>
>>> This is something very nice to have!<br>
>>> <br>
>>> A caveat to consider is the licensing for DSS imagery. They are not<br>
>>> available for commercial use, so we must ship this as an add-on through<br>
>>> KNewStuff ("Get New Data")<br>
>>> <br>
>>> Other sources of images are SDSS, the Hubble Legacy Archive (<a href="http://hla.stsci.edu" \
target="_blank">hla.stsci.edu</a>)<br> >>> and the recently released PanStarrs 1 survey. I think \
the PanStarrs 1<br> >>> survey has a large sky coverage (possibly even all sky -- I \
haven't<br> >>> checked). SDSS has a somewhat small footprint, and the Hubble only has<br>
>>> objects of interest.<br>
>>> <br>
>>> I didn't quite get what the problem involved is. The DSS is made from<br>
>>> digitizing scanned plates mostly from the Palomar Observatory and UKSTU<br>
>>> telescope. The result is that many plates have artefacts, and they are<br>
>>> completely uncalibrated. Planetary nebulae and bright emission nebulae tend<br>
>>> to be overexposed. There is no way around these problems other than going<br>
>>> to other surveys.<br>
>>> <br>
>>> Regards<br>
>>> Akarsh<br>
>>> <br>
>>> <br>
>> <br>
>> <br>
>> -- <br>
>> Best Regards,<br>
>> Jasem Mutlaq<br>
> <br>
> <br>
> <br>
> <br>
> <br>
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-- <br>
<div class="m_-8417383449373530433m_7160945877431352804gmail_signature">
<div dir="ltr">
<div>Best Regards,<br>
Jasem Mutlaq<br>
</div>
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-- <br>
<div class="m_-8417383449373530433gmail_signature">
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<div>Best Regards,<br>
Jasem Mutlaq<br>
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</blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature" \
data-smartmail="gmail_signature"><div dir="ltr"><div>Best Regards,<br>Jasem \
Mutlaq<br></div><div><br></div></div></div> </div>
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