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Hi Martin,
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<div class="">Please refer the API document, it says:</div>
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<td class="paramname" style="color: rgb(96, 32, 32); white-space: nowrap; font-weight: bold; vertical-align: top;">
x</td>
<td class="">The top left x-coordinate, in the level 0 reference frame. </td>
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<td class="paramname" style="color: rgb(96, 32, 32); white-space: nowrap; font-weight: bold; vertical-align: top;">
y</td>
<td class="">The top left y-coordinate, in the level 0 reference frame. </td>
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<td class="paramname" style="color: rgb(96, 32, 32); white-space: nowrap; font-weight: bold; vertical-align: top;">
level</td>
<td class="">The desired level. </td>
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<td class="paramname" style="color: rgb(96, 32, 32); white-space: nowrap; font-weight: bold; vertical-align: top;">
w</td>
<td class="">The width of the region. Must be non-negative. </td>
</tr>
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<td class="paramname" style="color: rgb(96, 32, 32); white-space: nowrap; font-weight: bold; vertical-align: top;">
h</td>
<td class="">The height of the region. Must be non-negative.</td>
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</tbody>
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<div class="">The x,y are based on level 0. The w,h is just pixels you want.</div>
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<div class="">Cheers,</div>
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<div class="">Ray</div>
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<blockquote type="cite" class="">
<div class="">On Oct 10, 2015, at 8:58 PM, Priv.-Doz. Dr. M. Weihrauch <<a href="mailto:martin.weihrauch@uni-koeln.de" class="">martin.weihrauch@uni-koeln.de</a>> wrote:</div>
<br class="Apple-interchange-newline">
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<div class="">Dear community:<br class="">
<br class="">
I have a C#-wrapper for OpenSlide, which I am using right now. However,<br class="">
concerning the OpenSlide read_region method, I am somewhat confused.<br class="">
There is a x, y, width, height and level.<br class="">
<br class="">
If I see it correctly (using my current software that I wrote), the<br class="">
parameters width and height are in relation to the level. E. g., when I<br class="">
grab a region with a width of 500 and height of 1000 from level 2, which<br class="">
may be total width x height 1000 x 2000, then I am actually grabbing a<br class="">
quarter of the whole image of that level.<br class="">
<br class="">
However, my experiments show that the x and y, so the offset from where<br class="">
I grab, are counting in relation to the full-size level (0). So, when I<br class="">
try to go to the middle of the image at level 2, I would use 500/1000 as<br class="">
coordinates, but with that strategy, I land somewhere at the upper left<br class="">
of the image (so I have to take e. g. 2000/4000, if that would be the<br class="">
middle of level 0).<br class="">
<br class="">
Is that really the case for OpenSlide or does my C# wrapper "translate"<br class="">
something wrong?<br class="">
<br class="">
Thanks<br class="">
<br class="">
Martin<br class="">
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<a href="mailto:openslide-users@lists.andrew.cmu.edu" class="">openslide-users@lists.andrew.cmu.edu</a><br class="">
https://lists.andrew.cmu.edu/mailman/listinfo/openslide-users<br class="">
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</blockquote>
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