<div dir="ltr"><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default" style="font-size:small">As the proposer of #thumbnail, we picked it because it seems to be a common term used to mean "fairly small preview", hence it is a child of preview (narrower). The general usage is that a client could feasibly load and/or display many thumbnails at once because they are small, so it is really a hint to a user interface.<br></div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default" style="font-size:small">Yes, data providers can chose the appropriate one and there is no specific "size" that makes a preview qualify as a thumbnail. At least for CADC, there is usually (~always) a #preview and a #thumbnail ("the better one or the smaller one" :-) but one doesn't need to have both to benefit clients. <br></div><div class="gmail_default" style="font-size:small"></div><div class="gmail_default" style="font-size:small"></div><div class="gmail_default" style="font-size:small"><br></div><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div>--<br></div><div>Patrick Dowler<br></div>Canadian Astronomy Data Centre<br></div>Victoria, BC, Canada<br></div></div></div></div></div><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, 2 Dec 2021 at 05:05, ada nebot <<a href="mailto:ada.nebot@astro.unistra.fr">ada.nebot@astro.unistra.fr</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Hi Markus,<br>
<br>
I wonder what the difference between preview and thumbnail is. In other words: when is one used against the other? when is a small preview considered a thumbnail? Also, does it make any real difference in the behaviour of a client? <br>
<br>
I call thumbnails to small things, but are previews of finding charts for instance thumbnails? For instance, do ZTF or LSST reference images (in whatever format) belong to this category? <br>
<br>
I see that preview is parent of thumbnail so I guess it is up to the data providers to use one or the other and for the client it doesn’t make much of a difference, right? <br>
<br>
Cheers,<br>
Ada<br>
<br>
<br>
> On 2 Dec 2021, at 11:49, Markus Demleitner <<a href="mailto:msdemlei@ari.uni-heidelberg.de" target="_blank">msdemlei@ari.uni-heidelberg.de</a>> wrote:<br>
> <br>
> Dear Semantics WG, dear DAL,<br>
> <br>
> We have another proposal for a new term in datalink/core:<br>
> <br>
> Vocabulary: <a href="http://www.ivoa.net/rdf/datalink/core" rel="noreferrer" target="_blank">http://www.ivoa.net/rdf/datalink/core</a><br>
> Author: <a href="mailto:pdowler.cadc@gmail.com" target="_blank">pdowler.cadc@gmail.com</a><br>
> Date: 2021-10-18<br>
> <br>
> Term: thumbnail<br>
> Action: Addition<br>
> Label: Small Graphical Representation<br>
> Description: A very small preview suitable for displaying many at one time<br>
> Relationships: rdfs:subProperyOf(preview)<br>
> Used-in: <a href="https://ws.cadc-ccda.hia-iha.nrc-cnrc.gc.ca/caom2ops/datalink?ID=ivo://cadc.nrc.ca/BLAST?BLASTabell31122006-12-21/REDUCED_250_2009-03-06" rel="noreferrer" target="_blank">https://ws.cadc-ccda.hia-iha.nrc-cnrc.gc.ca/caom2ops/datalink?ID=ivo://cadc.nrc.ca/BLAST?BLASTabell31122006-12-21/REDUCED_250_2009-03-06</a><br>
> <br>
> Rationale: The term is used to specify that the link target is a small<br>
> preview suitable for displaying many such "thumbnails" at one time. The<br>
> primary use case is for a user interface to load or display these in a<br>
> table or as a popup, usually one per row but a grid of thumbnails might<br>
> be useful as well.<br>
> <br>
> This is used in the CADC AdvancedSearch user interface as a popup when<br>
> users mouse over the preview links and allows the application to load<br>
> many of these at once. Example (BLAST + calibrated image query): <br>
> <br>
> <a href="https://www.cadc-ccda.hia-iha.nrc-cnrc.gc.ca/en/search/?Observation.collection=BLAST&Plane.calibrationLevel=2" rel="noreferrer" target="_blank">https://www.cadc-ccda.hia-iha.nrc-cnrc.gc.ca/en/search/?Observation.collection=BLAST&Plane.calibrationLevel=2</a><br>
> <br>
> (or in VCS at<br>
> <<a href="http://volute.g-vo.org/svn/trunk/projects/semantics/veps/VEP-011.txt" rel="noreferrer" target="_blank">http://volute.g-vo.org/svn/trunk/projects/semantics/veps/VEP-011.txt</a>>)<br>
> <br>
> Opinions? Endorsements?<br>
> <br>
> Thanks,<br>
> <br>
> Markus<br>
<br>
</blockquote></div>