Image Processing
Updated February 2020
Your eye's capabilities outstrip the technology about as often as the technological advantages blow away the limitations of the eye. It's pretty tough to find an event that can be faithfully recorded with a single correctly exposed image. The challenge is creating an image or movie that does both justice.
- Processing Toolbox A page outlining the tools I use and the reasons for choosing them
- Articles
- The parallactic angle, de-rotating in batch mode
- Enfuse for time lapses - tutorial
- Hugin tutorial - direct to just enfuse
- Hugin to stitch 3 images into a fisheye then loop
- Blender - overpowered for the basics, but free, no watermarks;
- ImageMagick scripts including Ken Burns effect during a time-lapse, Snibgo's custom IM filters
- Solar Altitude stamp on NLC (Noctilucent Cloud) images
Issues:
- Flicker and deflickering (basic)
- Brightness difference between Moon and foreground (basic composite with "lighten")
- Special case: EV changes for bright Moon on dark sky missed by luminance deflicker. Hence
- Dust shadows and flat fields
- Fake an underexposure after the fact, to a degree: Here's my trick
- Transforming a Canon 60Da (no IR-filter) image into "normal" colorspace
- Fixing Mach bands: light/dark stripes along abrupt gradients
- Timelapse deshake (automatically aligning hundreds of images to an anchor)
- Crescent Moon HDR