A simple way to visualize what is happening is with UCSF ChimeraX. You can use the gaussian filter function to select either the frown or the smile from the “hidden_frown.map”, and then you can visualize the FFT structure factor magnitudes for each one – here are the commands to do it -
open hidden_frown.map vol gaussian #1 sdev 0.5 vol gaussian #1 sdev 0.5 inv true vol fourier #1 vol fourier #2 vol fourier #3 Fun stuff- your example is a great way of illuminating what is going on with filtering and fourier transforms! Cheers, Chuck From: CCP4 bulletin board <[email protected]> on behalf of James Holton <[email protected]> Date: Sunday, April 30, 2023 at 5:16 PM To: [email protected] <[email protected]> Subject: Re: [ccp4bb] happy/sad maps Thank you Paul. This is interesting! I have not played with super-sampling yet. I am assuming you mean creating a new map 8x the size? If so, did you fill the interstitial grid with zeroes? Local maximum? Linear interpolation? Tricubic spline? And when you say "sharpen/blur" with a factor of 4. Is 4 a scale factor? or a B factor? Cheers, and I hope you had a pleasant weekend, -James On 4/28/2023 5:29 PM, Paul Emsley wrote: > What fun! > > super-sampled by a factor of 2 then sharpen/blur with a factor of 4 > gives a superposition > > Paul. > ######################################################################## To unsubscribe from the CCP4BB list, click the following link: https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.jiscmail.ac.uk%2Fcgi-bin%2FWA-JISC.exe%3FSUBED1%3DCCP4BB%26A%3D1&data=05%7C01%7Ccharles.sindelar%40YALE.EDU%7Cacedb11c93ac4900f10408db49c02e38%7Cdd8cbebb21394df8b4114e3e87abeb5c%7C0%7C0%7C638184862139535122%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=lfAErsKbQtKLBx8Xmmn%2BC7zG%2Bt6N43ChGLcniZrSyps%3D&reserved=0<https://www.jiscmail.ac.uk/cgi-bin/WA-JISC.exe?SUBED1=CCP4BB&A=1> This message was issued to members of https://nam12.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.jiscmail.ac.uk%2FCCP4BB&data=05%7C01%7Ccharles.sindelar%40YALE.EDU%7Cacedb11c93ac4900f10408db49c02e38%7Cdd8cbebb21394df8b4114e3e87abeb5c%7C0%7C0%7C638184862139535122%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=Nn%2BNpEPMzHrExi7899MakiwAJ8IJ5ZdgMsRIbuXjfZg%3D&reserved=0<http://www.jiscmail.ac.uk/CCP4BB>, a mailing list hosted by https://nam12.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.jiscmail.ac.uk%2F&data=05%7C01%7Ccharles.sindelar%40YALE.EDU%7Cacedb11c93ac4900f10408db49c02e38%7Cdd8cbebb21394df8b4114e3e87abeb5c%7C0%7C0%7C638184862139535122%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=AMn8ylqVwAO0sg%2BjlTi07Q20HVTD5ogHy2rQk1BPqfY%3D&reserved=0<http://www.jiscmail.ac.uk/>, terms & conditions are available at https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.jiscmail.ac.uk%2Fpolicyandsecurity%2F&data=05%7C01%7Ccharles.sindelar%40YALE.EDU%7Cacedb11c93ac4900f10408db49c02e38%7Cdd8cbebb21394df8b4114e3e87abeb5c%7C0%7C0%7C638184862139535122%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=R1Iq6MMuDWk2p%2FHKtmr9lWF7Vuzk%2FrZLMn7IVuZA4tI%3D&reserved=0<https://www.jiscmail.ac.uk/policyandsecurity/> ######################################################################## To unsubscribe from the CCP4BB list, click the following link: https://www.jiscmail.ac.uk/cgi-bin/WA-JISC.exe?SUBED1=CCP4BB&A=1 This message was issued to members of www.jiscmail.ac.uk/CCP4BB, a mailing list hosted by www.jiscmail.ac.uk, terms & conditions are available at https://www.jiscmail.ac.uk/policyandsecurity/
