<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><meta http-equiv="Content-Type" content="text/html; charset=utf-8" class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Hi Ada, <div class=""><br class=""></div><div class="">in my use cases, thumbnails are very low resolution versions of previews, so that it can be displayed very fast on web interfaces where many previews are shown altogether. </div><div class=""><br class=""></div><div class="">Exemple of datalink with #thumbnail:</div><div class=""><a href="http://vogate.obs-nancay.fr/nda/q/dl/dlmeta?ID=ivo%3A//vopdc.obspm/~%3Fnda/S000612_cdf" class="">http://vogate.obs-nancay.fr/nda/q/dl/dlmeta?ID=ivo%3A//vopdc.obspm/~%3Fnda/S000612_cdf</a><br class=""><div class=""><br class=""></div><div class="">and to make it more explicit:</div><div class="">- a preview: <a href="https://realtime.obs-nancay.fr/dam/databf/web/soleil/ql//B-W/2000/06/S000612.png" class="">https://realtime.obs-nancay.fr/dam/databf/web/soleil/ql//B-W/2000/06/S000612.png</a> </div><div class="">- a thumbnail: <a href="https://realtime.obs-nancay.fr/dam/databf/web/soleil/ql//B-W/2000/06/T_S000612.png" class="">https://realtime.obs-nancay.fr/dam/databf/web/soleil/ql//B-W/2000/06/T_S000612.png</a></div><div class=""><br class=""></div><div class="">Baptiste</div><div class=""><br class=""><blockquote type="cite" class=""><div class="">Le 2 déc. 2021 à 13:57, ada nebot <<a href="mailto:ada.nebot@astro.unistra.fr" class="">ada.nebot@astro.unistra.fr</a>> a écrit :</div><br class="Apple-interchange-newline"><div class=""><div class="">Hi Markus,<br class=""><br class="">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 class=""><br class="">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 class=""><br class="">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 class=""><br class="">Cheers,<br class="">Ada<br class=""><br class=""><br class=""><blockquote type="cite" class="">On 2 Dec 2021, at 11:49, Markus Demleitner <<a href="mailto:msdemlei@ari.uni-heidelberg.de" class="">msdemlei@ari.uni-heidelberg.de</a>> wrote:<br class=""><br class="">Dear Semantics WG, dear DAL,<br class=""><br class="">We have another proposal for a new term in datalink/core:<br class=""><br class="">Vocabulary: <a href="http://www.ivoa.net/rdf/datalink/core" class="">http://www.ivoa.net/rdf/datalink/core</a><br class="">Author: <a href="mailto:pdowler.cadc@gmail.com" class="">pdowler.cadc@gmail.com</a><br class="">Date: 2021-10-18<br class=""><br class="">Term: thumbnail<br class="">Action: Addition<br class="">Label: Small Graphical Representation<br class="">Description: A very small preview suitable for displaying many at one time<br class="">Relationships: rdfs:subProperyOf(preview)<br class="">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" class="">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 class=""><br class="">Rationale: The term is used to specify that the link target is a small<br class="">preview suitable for displaying many such "thumbnails" at one time. The<br class="">primary use case is for a user interface to load or display these in a<br class="">table or as a popup, usually one per row but a grid of thumbnails might<br class="">be useful as well.<br class=""><br class="">This is used in the CADC AdvancedSearch user interface as a popup when<br class="">users mouse over the preview links and allows the application to load<br class="">many of these at once. Example (BLAST + calibrated image query): <br class=""><br class=""><a href="https://www.cadc-ccda.hia-iha.nrc-cnrc.gc.ca/en/search/?Observation.collection=BLAST&Plane.calibrationLevel=2" class="">https://www.cadc-ccda.hia-iha.nrc-cnrc.gc.ca/en/search/?Observation.collection=BLAST&Plane.calibrationLevel=2</a><br class=""><br class="">(or in VCS at<br class=""><http://volute.g-vo.org/svn/trunk/projects/semantics/veps/VEP-011.txt>)<br class=""><br class="">Opinions? Endorsements?<br class=""><br class="">Thanks,<br class=""><br class=""> Markus<br class=""></blockquote><br class=""></div></div></blockquote></div><br class=""></div></div></body></html>