<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Strict//EN"> <html><head> <link rel="stylesheet" type="text/css" href="cmunipack.css"> <title>Making master-flat frame</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> </head><body><div class="main_head"><p class="head"><a href="index.html">C-Munipack 1.2</a> / <a href="node006.html">User's manual</a></p><h1>Making master-flat frame</h1></div><p>The master-flat frame is an image made of several flat images. The flat image is used in a process of CCD image calibration. To reduce a noise of a result, it is advisory to make a number of raw flat frames and combine them into one correction frame. The separate correction frame has to be used for each filter, if the color filters are used. Avoid eventual camera rotation on its mount.</p><p>Clear the table of source files. Click on the <tt>Files</tt> -> <tt>Clear files</tt> item in the main menu.</p><p>Add raw flat frames to a table using the <tt>Files</tt> -> <tt>Add folder</tt> item or the <tt>Files</tt> -> <tt>Add files</tt> item. See the chapter Redution of CCD frames for details. Always combine files of the same exposure duration only.</p><p>Make a copy source files. Click on the <tt>Files</tt> -> <tt>Fetch/convert files</tt> item in the main menu.</p><p>Click on the <tt>Files</tt> -> <tt>Master-flat frame</tt> item. A new dialog appears. In the dialog, specify whether all files shall be processed or only the selected ones. Confirm the dialog by the <tt>OK</tt> button. In the following dialog select a directory and enter the name of output file where a new master-flat frame shall be saved to. Press the <tt>Save</tt> button.</p><p>When a task is finished, a new preview window appers. A new master-flat frame is displayed in the window.</p></body></html>
