- HDR = High Dynamic Range (under Linux and others)
- LDR = Low Dynamic Range
LDR to LDR (Blending Exposures)
- GIMP tutorial
- blend two different exposures of the same scene that you would like to combine to get the best parts of both images
LDR to HDR
- generate at least 3 images, each one with different exposures
- to combine the images use:
- Hartmut Sbosny’s Bracketed exposures to HDR plugin in CinePaint (GTK+1 GUI) – tutorial
- pfstools, pfscalibration and pfstmo – tutorial
- the result of this is an HDR image that can be saved in the OpenEXR format
HDR to LDR
- the reason for tone mapping arises when we want to display the resulting HDR image
- most display devices, including monitors and printers are LDR devices
- book High Dynamic Range Imaging; Acquisition, Display, and Image-Based Lighting
- tone mapping operators provide more sophisticated methods for achieving the needed range compression
- pfstmo provides seven such operators with references to the original papers for each operator – GUI, tutorial