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Contains: 
Sunspots September 13 White Light Mosiac (large format stacked jpegs), 





    
        

            StarGale

Sunspots September 13 White Light Mosiac (large format stacked jpegs)

Technical card

Resolution: 5130x3398

Date:Sept. 13, 2014

Time: 14:08

Frames: 7

FPS: 125.00000

Focal length: 3000

Locations: Suburban backyard N/O Seattle, Lynnwood, WA, United States

Description

Image A: bin 25% 1282x849 (Original)
Image B: bin 35% 1814x1202
Image C: bin 50% 2565x1699
Image D: bin 71% 3627x2402
Image E: bin 100% 5130x3398 (Final)

All 5 images are identical except for full resolution size. Take your pick.

Test of stacking of full resolution high resolution jpegs using AutoStakkert. Rather than using the center crop movie mode which is only 640x480 pixels I decided to try stacking still images instead. This would be of no value for planetary images, but could be useful for solar and lunar images of the full disc or large regions. I took 20 still images over a 2 minute period and stacked the best 33 percent. The images were exposed for 1/125 seconds at ISO 100. White Balance was set to auto. The camera is unmodified.

I decided to use the jpegs straight from the camera rather than creating TIF files from the raw CR2 files because data would be lost when converting the files to AVI (I know of no software that will directly stack non-video data).

PIPP was used to convert the jpeg files using the "join" method into 4 overlapping sets because of the 3000x2000 pixel size limit. PIPP allows you to crop each of the files as it runs the conversion from jpeg to AVI.

AutoStakkert was used to stack each of the for sets. I used the latest supported version, 2.1.0.5., surpising because it would not open the 1920x1080 AVI video converted converted from a MOV file by PIPP in another test. I used an AP size of 100 because of the large frame size, normally I use size 25. AutoStakkert produces a TIF file.

StarTools was used to process the 4 TIF files. The DEV module darkened the overexposed images (gamma set to 25%). Wavelet Sharpen(Large structure size, scales 1-5 set to 100% and amount set to 100%), Heal to remove dust bunnies. Converted the TIF files to jpegs.

PhotoStitch used to stitch the 4 jpeg files arranged in 2x2 grid in scanner mode. Converted the resulting jpeg back to TIF.

StarTools was used to do a final sharpening of the resulting TIF when I decided it was unnecessarily blurry. Used Wavelet Sharpen Large Structure Size scales 1-2 at 100%, scale 3 at 50%, and amount set to 300%. This was the minimum setting providing a degree of sharpness at full resolution without looking too unnatural. I used the bin feature to produce images of 25, 33, 40, 71, and 100% of the original size. These are the values for the preset buttons. You can also bin at any percentage with a precision of 0.01%, for example 66.67%. I usually use 100% for pixel peeping, but often the image looks much better reduced.

Comments

Author

StarGale
StarGale
License: None (All rights reserved)
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Revisions

  • Sunspots September 13 White Light Mosiac (large format stacked jpegs), 





    
        

            StarGale
    Original
  • Sunspots September 13 White Light Mosiac (large format stacked jpegs), 





    
        

            StarGale
    B
  • Sunspots September 13 White Light Mosiac (large format stacked jpegs), 





    
        

            StarGale
    C
  • Sunspots September 13 White Light Mosiac (large format stacked jpegs), 





    
        

            StarGale
    D
  • Final
    Sunspots September 13 White Light Mosiac (large format stacked jpegs), 





    
        

            StarGale
    E

Histogram

Sunspots September 13 White Light Mosiac (large format stacked jpegs), 





    
        

            StarGale