IMAGE PROCESSING - Pedro Ré


IMAGING THE SUN (TUTORIALS) - PDF FILE (5Mb)


IMAGING THE SUN (POWERPOINT PRESENTATION) - PDF FILE (4.5Mb)


DEEP-SKY IMAGING (TUTORIALS) - PDF FILE (1Mb)

FULL DISK IMAGING (SUN)

  • Acquire Full Disk images
  • Save AVI files or SER files (12 bits)
  • Open AVISTACK or AUTOSTAKKERThttp://www.avistack.de/
  • Select AVI or SER files
  • Turn off Update display
  • Choose Batch processing - Batch processing
  • Open REGISTAX http://www.astronomie.be/registax/
  • Open FIT file (aligned and stacked in Avisatck or Autostakkert)
  • Process the combined image using the Wavelet-based image restoration
  • Reset the Wavelet filter (500 to 1000 center value)
  • Use layer 1, 2 and 3 of Wavelet filter (try several options)
  • Process image (DO ALL button)
  • Save image (16-bit TIFF file)
  • Compose the Mosaic
  • Open Microsoft ICE http://research.microsoft.com/en-us/um/redmond/groups/ivm/ice/
  • Compose the Mosaic (drop individual images into Microsoft ICE) Mosaic image (Full Disk)
  • Crop and save 16-bit TIF file (Microsoft ICE)
  • Process TIFF file in Photoshop Mosaic Image
  • Use Curves to adjust contrast and brightness if necessary Curves
  • Use Shadow/Highlights option Shadow/Highlights
  • Use Smart Sharpen if necessary
  • False Color Mapping BLUE CHANNEL GREEN CHANNEL RED CHANNEL
  • Save the final 16-bit TIF file (no compression)
  • Convert to 8-bit and save JPG file (no compression)

  • FULL SIZE - Imaging Session FULL DISK - DISK


    FULL SIZE - Imaging Session FULL DISK - PROMS


    FULL SIZE - Imaging Session FULL DISK - CaK

    HIGH RESOLUTION WHITE LIGHT (CONTINUUM) IMAGING (SUN)

  • Acquire high resolution WL images

  • Save AVI files or SER files (12 bits) (DMK or SKYnyx cameras)
  • Open AVISTACK or AUTOSTAKKERThttp://www.avistack.de/
  • Select AVI or SER files Open movie
  • Turn off Update display
  • Choose Batch processing - Batch processing
  • Open REGISTAX http://www.astronomie.be/registax/
  • Open FIT file (aligned and stacked in Avisatck) Open Fit file
  • Process the combined image using Wavelet-based image restoration
  • Reset the Wavelet filter (500 to 1000 center value) Wavelet Tab
  • Use layer 1, 2 and 3 of Wavelet filter - Gaussian (try several options) Wavelet-based image restoration
  • Process image (DO ALL button) Do All
  • Save image (16-bit TIFF file) Save TIFF 16-bit
  • Process TIFF file in Photoshop
  • Use Smart Sharpen Smart Sharpen
  • Use Curves to adjust contrast and brightness Curves
  • False color image False Color
  • Save the final 16-bit TIF file (no compression)
  • Convert to 8-bit and save JPG file (no compression)

  • FULL SIZE


    FULL SIZE

    HIGH RESOLUTION H-ALPHA IMAGING (SUN)

  • Acquire high resolution H-alpha images (50 to 75 gamma DISK/ 200 to 250 gamma PROMS - DMK cameras)
  • Save AVI files or SER files (12 bits) (DMK or SKYnyx cameras)
  • Align and Stack images in AVISTACK or AUTOSTAKKERT http://www.avistack.de/
  • Open REGISTAX http://www.astronomie.be/registax/
  • Open FIT file (aligned and stacked in Avisatck)
  • Process the combined image using Wavelet-based image restoration
  • Reset the Wavelet filter (500 to 1000 center value)
  • Use layer 1, 2 and 3 of Wavelet filter - gaussian (try several options) Wavelet-based image restoration
  • Save image (16-bit TIFF file)
  • Process TIFF file in Photoshop PS CS5
  • Use Curves to adjust contrast and brightness if necessary Curves
  • Use Shadow/Highlights option Shadow/Highlights
  • Use Smart Sharpen or Unsharp Mask
  • False Color Mapping BLUE CHANNEL GREEN CHANNEL RED CHANNEL
  • Save the final 16-bit TIF file (no compression)
  • Convert to 8-bit and save JPG file (no compression)
  • ARTIFICIAL FLAT-FIELD (SUN)

  • Open mosaic image (16-bit TIFF file) Open File
  • Create a new Layer Duplicate Layer
  • Create a Mask Create Mask
  • Copy mosaic image to Mask
  • Apply a Median Filter (e.g. radius 25) Median Filter
  • Reduce Mask brighthness (Curves) Reduce Mask brighthness
  • Apply Mask (Difference) Apply Mask
  • Reduce Mask Opacity if needed Reduce Mask Opacity
  • Flaten Layers
  • Use Curves and/or Levels to adjust contrast and brightness Use Curves and/or Levels
  • Save flat-field corrected image (16-bit TIFF file)
  • Before/After BEFORE/AFTER

  • Uncorrected mosaic image (Left)/flat-field corrected image (Right)

    AUTOSTAKKERT 2


    FULL SIZE
    HR Solar images aligned and stacked with Autostakkert 2. Number of stacked images (100, 250, 500 and 1000). LUNT152 F/6, 2" Lunt Solar Wedge, X3 Barlow, DMK41 (20120211).


    FULL SIZE
    HR Solar images aligned and stacked with Autostakkert 2, processed with Registax 6, and Photoshop 5. LUNT152 F/6, 2" Lunt Solar Wedge, X3 Barlow, DMK41 (20120211).

    H-ALPHA IMAGE PROCESSING FLOW (DEEP-SKY)

  • Acquire deep-sky images

    Calibrate, align and combine CCD images (Maxim DL)

  • Calibrate raw images
  • Use manual (2 stars) or automatic alignment operations (Auto correlation or Auto star matching)
  • Use SDMask or Sigma Clip for all combination operations
  • Perform a DDP-style stretch on the combined image (Don't do any sharpening as part of DDP. This is accomplished by selecting the "user" kernel filter, and setting the filter coefficients to 1.0 in the center, and zeros elsewhere). DDP with a small sharpening can also be used with good results (FFT Low-Pass, Custom 25 a 35% Cutoff)
  • Save the image (FITS format IEEE Float)

    Final Processing (Photoshop CS3, CS5)

  • Load the FITS DDP-stretched image into Photoshop (using Fits Liberator)
  • Use Curves to ajust contrast and brightness
  • Use (if necessary) Neat Image Photoshop plug-in to remove grain
  • Save the final 16-bit TIF file
  • Convert to 8-bit and save JPG file
  • LINKS
    Image processing
    CCD Revolution
    CCD imaging

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