Io in Transit   1 comment


Io in transit over Jupiter 9:30pm November 5, 2011.  Last image properly aligned, Europa to the west.  Io’s shadow is centered on the Great Red Spot.

Top image settings:

CI Cutoff: 60
Aligned Using: Luma Channel
Gross Alignment: Planetary
Pixel Alignment: Horizontal and Vertical Separate
Pixel Alignment Block Size: 32 x 32 pixels
Pixel Matching Tolerance :  7.00
Scale Frames by: 1 x
Frame Sharpening: Light
Gaussian Blur sharpness and alignment frames: On
Sharpen alignment frames: On
Auto Histogram Expand alignment frames: Off
HighQuality Bayer:Off
Auto Clip Area: On
Adjust Pixel Comparison Area Brightness: Off
Spatial Sharpness Distance: Medium
Remove Hot & Cold Pixels: Off
Binning Frames 2×2: Off
Averaging Images
Subtracting Background: Off
Gradient Leveling: Off
Sharpness Statistics: Min 1.797764 , Max 3.714247 , STD0.226313 , Mean 3.258496 , Median 3.302502 , Mode 3.235126, CutOff  Value 3.384226
Pixel Matching Value:  7.00

Main Image Centroid   X:553.1, Y:654.4
Pixel Area One Centroid  X:595.1, Y:642.4
Pixel Area Two Centroid  X:544.1, Y:611.4
Stacked 99 out of 334 frames

Second image settings:

—-Processing Movie: 20111105_213309_L.mov 1 of 1
Stacking : 16 Bit Movie
CI Cutoff: 80
Aligned Using: Luma Channel
Gross Alignment: Planetary
Pixel Alignment: Horizontal and Vertical Separate
Pixel Alignment Block Size: 96 x 96 pixels
Pixel Matching Tolerance :  5.00
Scale Frames by: 2 x
Frame Sharpening: Light with Noise Reduction
Gaussian Blur sharpness and alignment frames: Off
Sharpen alignment frames: On
Auto Histogram Expand alignment frames: Off
HighQuality Bayer:Off
Auto Clip Area: On
Adjust Pixel Comparison Area Brightness: Off
Spatial Sharpness Distance: Medium
Remove Hot & Cold Pixels: Off
Binning Frames 2×2: Off
Averaging Images
Subtracting Background: Off
Gradient Leveling: Off
Sharpness Statistics: Min 1.802817 , Max 3.480796 , STD0.202311 , Mean 3.070980 , Median 3.087520 , Mode 3.087520, CutOff  Value 3.359611
Pixel Matching Value:  5.00

Main Image Centroid   X:1108.6, Y:1290.6
Pixel Area One Centroid  X:1194.6, Y:1261.6
Pixel Area Two Centroid  X:1154.6, Y:1210.6
Stacked 19 out of 334 frames

The upper image got pretty soft, so I ended up sharpening it in Photoshop, oversharpened, which is a habit hard to break.  On the second image, I reduced the unsharp mask in Photoshop to 50%.  The moons and the shadow ended up much rounder.  In the third image I stayed in Astro IIDC and adjusted the sharpness and tonal range with the image controls.  No further sharpening.  Here is the Image Controls window for the third image:

The second image had curves at .85 and cutoff zero.   All other settings were the same.  Below is for image 4.

Turning noise reduction and saturation off sharpened the image.  Lowering the curve brightened it up.

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Posted November 7, 2011 by finkh in Uncategorized

One response to “Io in Transit

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  1. Great job! Wonderful image!

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