== PSPHOT Kron Measurements investigation ==

This page describes some investigations comparing the Kron radius and magnitudes measured by psphot

 * Overview of the Issue
 * Data Sample
 * Recipe Choices
   * Default: Smooth, apply window function, apply weight function
   * No Window
   * No weight
   * No Window no weight, no smooth
   * No Window no weight, no smooth
 * Results
   * Summary Statistics
   * Histogram of kron radius
   * Difference in radius
   * difference in magnitude


=== Kron Radius Histograms ===
The following images contain histograms of the measured Kron Radius for various recipe combinations. 

 * Green "Expected" Kron Radius for the simulated galaxy
 * Grey  Kron Radius measured by SExtractor (provided by Peter Draper)
 * Red   Kron Radius measured by psphot

Default recipe: Measure on smoothed image, gaussian weighting, window function
[[Image(kr.default.png)]]

Window function no weighting

[[Image(kr.noweight.png)]]

Weighting no window

[[Image(kr.nowin.png)]]

No Window No weight

[[Image(kr.noweight.nowin.png)]]

No window no weighting no smoothing

[[Image(kr.nosmooth.noweight.nowin.png)]]



=== Difference In Kron Radius ===

Default Recipe

[[Image(dkr.v.kr.default.png)]] [[Image(dkr_kr.v.kr.default.png)]] 

Window Function no weighting

[[Image(dkr.v.kr.noweight.png)]] [[Image(dkr_kr.v.kr.noweight.png)]] 

Weighting, no window

[[Image(dkr.v.kr.nowin.png)]] [[Image(dkr_kr.v.kr.nowin.png)]] 

No window, no weighting

[[Image(dkr.v.kr.noweight.nowin.png)]] [[Image(dkr_kr.v.kr.noweight.nowin.png)]]

No window, no weighting, no smoothing

[[Image(dkr.v.kr.nosmooth.noweight.nowin.png)]] [[Image(dkr_kr.v.kr.nosmooth.noweight.nowin.png)]] 

=== Statistics ===