{"action":"created","comment":{"url":"https://api.github.com/repos/GalSim-developers/GalSim/pulls/comments/45538189","id":45538189,"diff_hunk":"@@ -142,6 +142,25 @@ def resize_multiplier_cache(maxsize):\n         \"\"\"\n         ChromaticObject._multiplier_cache.resize(maxsize)\n \n+    def _fiducial_profile(self, bandpass):\n+        \"\"\"\n+        Return a fiducial achromatic profile of a chromatic object that can be used to estimate\n+        default output image characteristics, or in the case of separable profiles, can be scaled to\n+        give the monochromatic profile at any wavelength or the wavelength-integrated profile.\n+        \"\"\"\n+        bpwave = bandpass.effective_wavelength\n+        candidate_waves = [bpwave, 0.5 * (bandpass.blue_limit + bandpass.red_limit)]\n+        candidate_waves = np.union1d(candidate_waves, bandpass.wave_list)\n+        candidate_waves = np.union1d(candidate_waves, self.wave_list)\n+        # Prioritize wavelengths near the bandpass effective wavelength.\n+        candidate_waves = candidate_waves[np.argsort(np.abs(candidate_waves - bpwave))]","path":"galsim/chromatic.py","position":null,"original_position":15,"commit_id":"4ef38c0d543af83269454aaa6fdda304e5840abb","original_commit_id":"a8a96c08b1f02dab5fd3671de5f2d06955844ce7","user":{"login":"jmeyers314","id":3650485,"avatar_url":"https://avatars.githubusercontent.com/u/3650485?v=3","gravatar_id":"","url":"https://api.github.com/users/jmeyers314","html_url":"https://github.com/jmeyers314","followers_url":"https://api.github.com/users/jmeyers314/followers","following_url":"https://api.github.com/users/jmeyers314/following{/other_user}","gists_url":"https://api.github.com/users/jmeyers314/gists{/gist_id}","starred_url":"https://api.github.com/users/jmeyers314/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/jmeyers314/subscriptions","organizations_url":"https://api.github.com/users/jmeyers314/orgs","repos_url":"https://api.github.com/users/jmeyers314/repos","events_url":"https://api.github.com/users/jmeyers314/events{/privacy}","received_events_url":"https://api.github.com/users/jmeyers314/received_events","type":"User","site_admin":false},"body":">I would have preferred only doing all this if the bpwave had zero flux, since that is by far the dominant case:\r\n\r\nDone.","created_at":"2015-11-21T01:21:36Z","updated_at":"2015-11-21T01:21:36Z","html_url":"https://github.com/GalSim-developers/GalSim/pull/685#discussion_r45538189","pull_request_url":"https://api.github.com/repos/GalSim-developers/GalSim/pulls/685","_links":{"self":{"href":"https://api.github.com/repos/GalSim-developers/GalSim/pulls/comments/45538189"},"html":{"href":"https://github.com/GalSim-developers/GalSim/pull/685#discussion_r45538189"},"pull_request":{"href":"https://api.github.com/repos/GalSim-developers/GalSim/pulls/685"}}},"pull_request":{"url":"https://api.github.com/repos/GalSim-developers/GalSim/pulls/685","id":48251722,"html_url":"https://github.com/GalSim-developers/GalSim/pull/685","diff_url":"https://github.com/GalSim-developers/GalSim/pull/685.diff","patch_url":"https://github.com/GalSim-developers/GalSim/pull/685.patch","issue_url":"https://api.github.com/repos/GalSim-developers/GalSim/issues/685","number":685,"state":"open","locked":false,"title":"#680","user":{"login":"jmeyers314","id":3650485,"avatar_url":"https://avatars.githubusercontent.com/u/3650485?v=3","gravatar_id":"","url":"https://api.github.com/users/jmeyers314","html_url":"https://github.com/jmeyers314","followers_url":"https://api.github.com/users/jmeyers314/followers","following_url":"https://api.github.com/users/jmeyers314/following{/other_user}","gists_url":"https://api.github.com/users/jmeyers314/gists{/gist_id}","starred_url":"https://api.github.com/users/jmeyers314/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/jmeyers314/subscriptions","organizations_url":"https://api.github.com/users/jmeyers314/orgs","repos_url":"https://api.github.com/users/jmeyers314/repos","events_url":"https://api.github.com/users/jmeyers314/events{/privacy}","received_events_url":"https://api.github.com/users/jmeyers314/received_events","type":"User","site_admin":false},"body":"This PR adds a method `_fiducial_profile` to chromatic objects that returns an achromatic profile by evaluating the chromatic profile at a fiducial wavelength.  Previously, this fiducial wavelength had just been the effective wavelength of a `Bandpass`.  The new method adds fallback wavelengths to try to ensure that the fiducial achromatic profile has non-zero flux, which is necessary to rapidly draw separable 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