ObsAstro
  • 1. Basic image statistics
    • 1.1. Before you begin
    • 1.2. Overview
    • 1.3. Working with image sequences
    • 1.4. Basic statistics
    • 1.5. Calculating gain: overview
    • 1.6. Measurements in Astro ImageJ
    • 1.7. Image arithmetic
    • 1.8. Calculating gain: step-by-step
    • 1.9. List of all questions
  • 2. Image reduction: overview and example
    • 2.1. Before you begin
    • 2.2. Why median, not average?
    • 2.3. Master frames
    • 2.4. Your first reduction: a flat frame
    • 2.5. List of all questions
  • 3. Planning Observations for your Observing Project
    • 3.1. Before you begin
    • 3.2. Choosing a target for your project
    • 3.3. Checking the “Mechanical” and “Scientific” Viability of your Project
    • 3.4. List of all questions
  • 4. Image reduction by hand
    • 4.1. Before you begin
    • 4.2. Science image reduction: overview
    • 4.3. Science image reduction by hand
    • 4.4. List of all questions
  • 5. Automated image reduction
    • 5.1. Before you begin
    • 5.2. (Semi) Automated reduction in AstroImageJ
    • 5.3. Make a master bias image
    • 5.4. Make master dark image
    • 5.5. Make master flat image
    • 5.6. Reduce science image(s)
    • 5.7. List of all questions
  • 6. Photometry in AstroImageJ: Introduction
    • 6.1. Before you begin
    • 6.2. Photometry in AIJ
    • 6.3. From counts to magnitudes
    • 6.4. List of all questions
  • 7. Multi-aperture photometry (and the effects of airmass)
    • 7.1. Before you begin
    • 7.2. Photometry setup
    • 7.3. Multi-aperture photometry in AstroImageJ
    • 7.4. Magnitude and airmass
    • 7.5. List of all questions
  • 8. Planning How You Turn Science Images Into Science
    • 8.1. Introduction
    • 8.2. Image Processing Questions
    • 8.3. Data Processing Questions
    • 8.4. List of all questions
 
ObsAstro
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  • 4. Image reduction by hand
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4. Image reduction by handΒΆ

Note

You should not carry out your reductions this way for large projects. This introduction has you carry out several steps manually that are better done automatically.

  • 4.1. Before you begin
  • 4.2. Science image reduction: overview
    • 4.2.1. Some Vocabulary
    • 4.2.2. Reduction: the concept
    • 4.2.3. Reduction steps
      • 4.2.3.1. Case 1: dark and science images have different exposure times
      • 4.2.3.2. Case 2: dark and science images have the same exposure times
  • 4.3. Science image reduction by hand
  • 4.4. List of all questions
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