<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"></head><body><div>Great, thx</div><div><br></div><div>If the openslide zoomlevel is eg only 2px bigger than the openslide level, where do you set the cut off not to take the bigger openslide zoom level?</div><div><br></div><div><br></div><div><br></div><div id="composer_signature"><div style="font-size:85%;color:#575757">Von meinem Samsung Galaxy Smartphone gesendet.</div></div><div style="font-size:100%;color:#000000"><!-- originalMessage --><div>-------- Ursprüngliche Nachricht --------</div><div>Von: Benjamin Gilbert <bgilbert@cs.cmu.edu> </div><div>Datum: 02.09.2015 19:52 (GMT+01:00) </div><div>An: openslide-users@lists.andrew.cmu.edu </div><div>Betreff: Re: Questions about tile-serving </div><div><br></div></div>Hi Martin,<br><br>On 09/02/2015 08:06 AM, Priv.-Doz. Dr. M. Weihrauch wrote:<br>> - If I am not mistaken, I would now have a look in OpenSlide, if that<br>> specific zoom level according to the dimensions exists in the original<br>> image, i. e. one of the levels of the original image has also<br>> approximately 16,321 pixels in width.<br><br>It's best to match OpenSlide levels with Deep Zoom levels using <br>downsample values rather than level dimensions. The OpenSlide level <br>downsample isn't necessarily exactly the ratio of the level size to the <br>size of level 0, if OpenSlide knows that the level sizes are subject to <br>rounding or other errors.<br><br>> If yes, I extract my e. g. 256x256<br>> directly. If not, then I take the next bigger zoom level, extract<br>> 512x512 and resize to 256x256?<br><br>Take the next larger zoom level, extract a tile 256 * (downsample of <br>Deep Zoom level / downsample of OpenSlide level) on a side, resize to <br>256x256.<br><br>> - Are the zoom levels for most openslide images dividing by 2 and 4 for<br>> the next zoom level or are there some other exotic formats?<br><br>Most formats do have zoom levels at powers of 2 or 4, but arbitrary <br>downsamples are supported and will sometimes occur.<br><br>> 2. If the deepzoom overlap is 1, does that mean that I have to add 1<br>> pixel on the right and on the bottom border of the tile or 1 pixel to<br>> each side (given that this is not a tile from the image border)?<br><br>One pixel on each side, except at the image borders.<br><br>--Benjamin Gilbert<br><br>_______________________________________________<br>openslide-users mailing list<br>openslide-users@lists.andrew.cmu.edu<br>https://lists.andrew.cmu.edu/mailman/listinfo/openslide-users<br></body></html>