{"id":1480,"date":"2021-08-24T20:00:37","date_gmt":"2021-08-25T01:00:37","guid":{"rendered":"https:\/\/www.gifnet.us\/?p=1480"},"modified":"2021-08-24T20:00:38","modified_gmt":"2021-08-25T01:00:38","slug":"astronomy-report-08-24-21-calibration-frames-and-astrophotography-ap-part-1-flats","status":"publish","type":"post","link":"https:\/\/www.gifnet.us\/?p=1480","title":{"rendered":"Astronomy Report 08-24-21 \u2013 Calibration Frames and Astrophotography (AP) \u2013 Part 1 &#8211; Flats"},"content":{"rendered":"\n<p>There are three main type of calibration frames taken in AP.&nbsp; They are Dark, Flat and Bias.&nbsp; I will go over each one in detail on how I plan to create them.&nbsp; The definitions below were obtained from <a href=\"https:\/\/astrobackyard.com\/\">astrobackyard.com<\/a>.&nbsp; An excellent resource for beginning AP.<\/p>\n\n\n\n<p>Flat Frames &#8211; <em><u>The idea is to evenly illuminate the field. The early morning sky is bright enough to create a successful flat frame, as long as you diffuse the light using a white t-shirt or similar translucent material.<\/u><\/em>&nbsp;<\/p>\n\n\n\n<p>Bias Frames &#8211; <em><u>The main reason amateur astrophotographers take bias frames is to reduce noise in their images, more specifically the&nbsp;fixed-pattern noise. No matter what type of camera you are taking your images with, the signal-to-noise ratio (S\/N) is often the primary deciding factor between a good image and a great one.<\/u><\/em><\/p>\n\n\n\n<p>Dark Frames <em>&#8211; <u>Essentially, applying dark frames to your final astrophotography image will reduce the amount of noise in your image. You will benefit from an improved signal-to-noise ratio, which means a higher quality image with lots of detail.<\/u><\/em><\/p>\n\n\n\n<p>I started working with flats by taking a couple of test images.&nbsp; I pointed my scope straight up and used my tablet by turning the display all the way down and set the background to white.&nbsp; I took a couple of sheets of 20lb printer paper between the scope and tablet and fired off a couple of shots.&nbsp; I compared the histogram in Adobe to what the astrobackyard.com example said was good and they looked to be really close to the same.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>There are three main type of calibration frames taken in AP.&nbsp; They are Dark, Flat and Bias.&nbsp; I will go over each one in detail on how I plan to <a class=\"more-link\" href=\"https:\/\/www.gifnet.us\/?p=1480\">Continue Reading &rarr;<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0},"categories":[151,152,164],"tags":[],"_links":{"self":[{"href":"https:\/\/www.gifnet.us\/index.php?rest_route=\/wp\/v2\/posts\/1480"}],"collection":[{"href":"https:\/\/www.gifnet.us\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.gifnet.us\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.gifnet.us\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.gifnet.us\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1480"}],"version-history":[{"count":1,"href":"https:\/\/www.gifnet.us\/index.php?rest_route=\/wp\/v2\/posts\/1480\/revisions"}],"predecessor-version":[{"id":1481,"href":"https:\/\/www.gifnet.us\/index.php?rest_route=\/wp\/v2\/posts\/1480\/revisions\/1481"}],"wp:attachment":[{"href":"https:\/\/www.gifnet.us\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1480"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.gifnet.us\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1480"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.gifnet.us\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1480"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}