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Fotoxx 5.3 (Default branch)
09-18-2008
Fotoxx is a program for improving digital photos. It allows you to navigate through large image directories using a window of thumbnail images, create HDR (high dynamic range) images by combining bright and dark images to improve details visible in both bright and dark areas, create panoramas by joining overlapped images, adjust brightness and color intensity independently for different underlying brightness levels, reduce fog or haze by removing "whiteness" and intensifying colors, rotate an image (level a tilted image or turn 90 degrees), remove red-eyes from electronic flash photos, sharpen, resize, or crop images, reduce noise in low-light photos, change color depth, and stretch an image by dragging the mouse.License: GNU General Public License v2Changes:|
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pfsview(1) General Commands Manual pfsview(1) NAME
pfsview - Viewer for high-dynamic range images in pfs format SYNOPSIS
pfsview [--window_min <log_lum>] [--window_max <log_lum>] DESCRIPTION
pfsview is a QT application for viewing high-dynamic range images. It expects pfs stream on the standard input and displays the frames in that stream one by one. pfsv script can be more convienent to use if hdr images are to be displayed without any prior processing. DYNAMIC RANGE WINDOW
To show high-dynamic range data on a low-dynamic range monitor, pfsview uses concept of a dynamic range window. The dynamic range window is the highest and lowest value that should be mapped to black and white pixel. Values above or below the window are clipped (see clipping methods below). The dynamic range window is displayed in pfsview as a blue area on the dynamic range scale (second toolbox from the top). The window can be moved, shrunk and expended using a mouse or a keyboard. CLIPPING METHODS
Currently, two clipping methods are available (see View menu): Simple clipping The values above and below the dynamic range window are displayed as black or white. Color-coded clipping The values above the dynamic range window are displayed as yellow and below the window as green. This is helpful to see which parts of the image do not fit into the selected dynamic range. Keep brightness and hue This method tries to preserve brightness and hue while sacrificing color saturation when the colors exceed the RGB color gamut. Col- ors are desaturated in the RGB color space towards the neutral color (D65) of the corresponding luminance. MAPPING METHODS
High-dynamic range data are usually better visualized using non-linear scale, for example a logarithmic or a power function. pfsview offers several such scales, shown in View menu. Gray-scale values for each mapping method are computed by the formulas: LINEAR: y = (x-min)/(max-min) GAMMA: y = [ (x-min)/(max-min) ]^gamma LOGARITHMIC: y = (log10(x)-log10(min))/(log10(max)-log10(min)) where y is the gray-scale value after mapping, x is an input HDR value, min and max are lower and upper bounds of the dynamic range window. OPTIONS
--window_min <log_lum> Lower bound of the values that should be displayed or minimum value of the dynamic range window. The value should be given in log_10 units, for example -1 if the lower bound should be 0.1 (10^-1). --window_max <log_lum> Upper bound of the values that should be displayed or minimum value of the dynamic range window. The value should be given in log_10 units, for example -1 if the upper bound should be 0.1 (10^-1). EXAMPLES
pfsin memorial.hdr | pfsview See the memorial image. pfsv memorial.hdr The same as above, but using the utility script 'pv'. SEE ALSO
pfsv(1) pfsin(1) BUGS
Zomming in may sometimes show artifacts. Please report bugs and comments to Rafal Mantiuk <mantiuk@mpi-sb.mpg.de>. pfsview(1)