Index: /trunk/doc/psphot/psphot.txt
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+
+psphot description article (outline)
+
+- background
+
+- process
+
+  - image preparation
+
+    - load image
+    - measure sky level & noise
+    - construct noise image
+    - construct mask image
+
+  - PSF determination 
+
+    - initial object detection (find peaks)
+    - measure object moments & basic properties
+    - classify on basis of moments
+    - select likely PSF stars
+    - test PSF model functions
+    - select best PSF model function
+    - aperture correction  
+    
+  - apply PSF to sources
+
+    - use fit result to select PSF-like objects
+    - fit and subtract PSF-like objects
+
+
+- aperture photometry vs psf photometry
+
+  - aperture is always the reference
+  - how do we choose an appropriate aperture
+  -