<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=""><div class=""><br class=""></div>The other thing that is strange here is that there are negative values to begin with in the extracted map… <div class=""><br class=""></div><div class="">The function ‘File -> <span style="caret-color: rgb(51, 51, 51); color: rgb(51, 51, 51); font-size: 14.66670036315918px;" class="">save selected regions to .mrc</span>' only takes values inside segments, which typically only have positive values in them, so I’m surprised to see negative values. Could you tell us what the threshold the map was when segmenting? I assume it was positive otherwise you would have seen a box around the entire map when doing the segmentation.</div><div class=""><br class=""></div><div class="">Looking at the code, the same function seems to use whatever map is selected in the Segment map field (top of the Segment Map dialog) to extract from, if it’s a different map than the original map (perhaps one of the other region maps got selected somehow - I tend to fall into this trap myself a lot), it will probably generate nonsense like that - should handle this better somehow. So can you check that when you run the function, that the original map is selected in that field?</div><div class=""><br class=""></div><div class="">Btw, I’m hoping to switch soon to ChimeraX, but have updated newer versions of Segger in Chimera lately with fixes, though you have to install it separately from <a href="https://github.com/gregdp/segger" class="">https://github.com/gregdp/segger</a>. In these newer versions you may want to try out the ‘Extract’ dialog which gives you a bit more control over what is happening when doing this kind of operation:</div><div class=""><a href="https://github.com/gregdp/segger/blob/master/tutorials/Segger Tutorial 5 - Extract.pdf" class="">https://github.com/gregdp/segger/blob/master/tutorials/Segger%20Tutorial%205%20-%20Extract.pdf</a></div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">Greg</div><div class=""><div><br class=""></div><div><br class=""></div><div><br class=""></div><div><br class=""><blockquote type="cite" class=""><div class="">On Feb 22, 2022, at 3:33 PM, Tom Goddard <<a href="mailto:goddard@sonic.net" class="">goddard@sonic.net</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><meta http-equiv="Content-Type" content="text/html; charset=us-ascii" class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Hi Shruthi,<div class=""><br class=""></div><div class=""> EMDB 2329 is quite strange in that the values outside the structure are -3 and lower and the values inside the structure are -3 to 1.44. Usually the values outside the structure are mostly at 0. This may be confusing Segger. The UCSF Chimera team did not write Segger -- it was written by Greg Pintilie and I do not know if it expects map values that it extracts for segmented regions to be above 0.</div><div class=""><br class=""></div><div class=""> At any rate, you can probably fix this weird behavior by adding about 3.2 to the original EMDB map so the structure values are above 0, rather than above -3.2 using the vop scale command, for example,</div><div class=""><br class=""></div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>vop scale #0 shift 3.2<br class=""><div class=""><br class=""></div><div class="">documentation</div><div class=""><br class=""></div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span><a href="https://www.cgl.ucsf.edu/chimera/docs/UsersGuide/midas/vop.html#scale" class="">https://www.cgl.ucsf.edu/chimera/docs/UsersGuide/midas/vop.html#scale</a></div><div class=""><br class=""></div><div class=""> Tom</div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><blockquote type="cite" class=""><div class="">On Feb 22, 2022, at 11:46 AM, Shruthi Viswanath <<a href="mailto:shruthi.viswanath@gmail.com" class="">shruthi.viswanath@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class="">Thanks Tom. When I adjust the threshold to a higher level only a small part of the segmented density is seen; it does not look like the segmented region at all. Attaching screenshots of the volume viewer with the full segmentation and with the threshold increased. </div><br class=""><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Feb 23, 2022 at 1:03 AM Tom Goddard <<a href="mailto:goddard@sonic.net" class="">goddard@sonic.net</a>> wrote:<br class=""></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div style="overflow-wrap: break-word;" class="">Hi Shruthi,<div class=""><br class=""></div><div class=""> It is probably because Chimera did not set the threshold level for showing that map to a reasonable value. Try adjusting the threshold for that new map to a higher level. If you want more help with it, send a screenshot of what the Volume Viewer window looks like, showing the histogram of the map values and the threshold level.</div><div class=""><br class=""></div><div class=""><span style="white-space:pre-wrap" class=""> </span>Tom</div><div class=""><br class=""><div class=""><br class=""><blockquote type="cite" class=""><div class="">On Feb 21, 2022, at 8:27 PM, Shruthi Viswanath via Chimera-users <<a href="mailto:chimera-users@cgl.ucsf.edu" target="_blank" class="">chimera-users@cgl.ucsf.edu</a>> wrote:</div><br class=""><div class=""><div dir="ltr" class=""><div class="gmail_quote"><div dir="ltr" class="gmail_attr"><span style="color:rgb(51,51,51);font-size:14.6667px" class="">Hello Chimera team, </span><br class=""></div><div dir="ltr" class=""><p style="color:rgb(51,51,51);font-size:14.6667px" class="">We have a problem with saving segmented regions from EMD 2329 using Segger. When we segment one of the 9 spokes from this EM map and try to do File -> save selected regions to .mrc from the Segger window it displays a box around the selected region (see screenshot) and the saved .mrc file just shows a small blob and does not look like the original selected region. Could it be because of the lower than usual density range of this particular map? </p><p style="color:rgb(51,51,51);font-size:14.6667px" class="">Thanks very much</p><p style="color:rgb(51,51,51);font-size:14.6667px" class="">Shruthi</p><div style="color:rgb(51,51,51);font-size:14.6667px" class="">--<br class=""><div style="margin:0px;padding:0px;font-family:monospace" class="">Shruthi Viswanath<br class="">Reader F (Assistant Professor), National Center for Biological Sciences (NCBS)</div><div style="margin:0px;padding:0px;font-family:monospace" class="">GKVK, Bellary Road, Bangalore, India 560065<br class="">Tel: +91 80 6717-6152<br class="">Email: <a href="mailto:shruthiv@ncbs.res.in" rel="noreferrer" style="color:rgb(0,105,166)" target="_blank" class="">shruthiv@ncbs.res.in</a> </div><div style="margin:0px;padding:0px;font-family:monospace" class="">Web: <a href="https://www.ncbs.res.in/faculty/shruthi" rel="noreferrer" style="color:rgb(0,105,166)" target="_blank" class="">https://www.ncbs.res.in/faculty/shruthi</a></div></div></div>
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