aview(1) [debian man page]

AVIEW(1)						      General Commands Manual							  AVIEW(1)

NAME

       aview - A high quality ASCII art image viewer

SYNOPSIS

       aview [options] filename.p[ngbp]m
       asciiview [options] filename.xxx

DESCRIPTION

       This manual page was written for the Debian GNU/Linux distribution because the original program does not have a manual page.

       aview/asciiview is an image viewer which displays the images in ASCII art...

       aview  supports	zooming/unzooming,  three  dithering  modes, inversion, contrast, brightness, gamma control and can save into many formats
       (html, text, ansi, more/less etc.).

       aview can only show files in the PNM file format. But asciiview automatically converts the file formats to PNM (with extern  programs  like
       NetPBM and ImageMagic) and then runs aview.

       It supports the usual aalib drivers (e.g. slang, x11 and stdout) as well as the mousedrivers X11 and gpm.

CONTROLS

       a,w,d,x
	      Move the image one row/column.

       A,W,D,X
	      Move the image one page.

       Z,+    Zoom in.

       z,-    Zoom out.

       s      Save image.

       m      Change dithering mode.

       q      Quit the viewer.

       i      Turn inversion on.

       I      Turn inversion off.

       u      Select attributes.

       f      Select font.

       SPACE  Redraw screen.

       .      Increase contrast (dot).

       ,      Decrease contrast (comma).

       '      Increase gamma (single quote).

       ;      Decrease gamma (semicolon).

       >      Increase brightness.

       <      Decrease brightness.

OPTIONS

       For a complete description, type aview --help.  This shows all options.

BUGS

       Please report any bugs you find to Jan Hubicka <hubicka@freesoft.cz>.

LICENSE

       aview is covered by the GNU General Public License (GPL).

SEE ALSO

       aafire(1), aainfo(1), aasavefont(1), aatest(1), aaflip(1), aa3d(1), aatv(1), bb(1), xaos(6).

AUTHOR

       Jan Hubicka <hubicka@freesoft.cz>

       This manual page was written by Michael Bramer <grisu@debian.org>, for the Debian GNU/Linux system (but may be used by others).

								 December 17, 2001							  AVIEW(1)

pfsglview(1)						      General Commands Manual						      pfsglview(1)

NAME

       pfsglview - Viewer for high-dynamic range images in pfs format

SYNOPSIS

       pfsglview [--h] [--v]

DESCRIPTION

       pfsview	is  a  OpenGL/GLUT 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.

DYNAMIC RANGE WINDOW

       To show high-dynamic range data on a low-dynamic range monitor, pfsglview 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 pfsglview 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.

ZOOMING AND PANNING

       To zoom image, the mouse can be dragged in vertical direction with the left button pressed.  Pressing [space] button or pressing left mouse
       button above the statistic window (left-bottom corner) changes from zooming to panning modes and vice versa. To pan image, the mouse can be
       dragged in vertical and horizontal directions with the left button pressed.

POPUP MENU OPTIONS

       Zoom reset
	      Set default zoom parameters.

       Zoom in
	      Increase image (mouse dragging with left button pressed).

       Zoom out
	      Decrease image (mouse dragging with left button pressed).

       Increase exposure
	      Move dynamic range window into higher luminance values.

       Decrease exposure
	      Move dynamic range window into lover luminance values.

       Extend dynamic range
	      Extend dynamic range window.

       Shrink dynamic range
	      Shrink dynamic range window

       Low dynamic range
	      Set dynamic range window to <-1,1> range (log scale).

       Fit to dynamic range
	      Set dynamic range windo to minimum and maximum luminance of a given image.

       Choose channel
	      Change image data channel.

       Mapping method
	      Change mapping method (see below for details).

       Next frame
	      Display next image from the pipe.

       Previous frame
	      Display previous image from the pipe.

       Histogram
	      Switch on/off histogram window.

       Info   Switch on/off info window.

       Save&Quit
	      Send the visible LDR image (8-bits) to stdout and quit pfsglview.

MAPPING METHODS

       High-dynamic  range  data  are  usually	better visualized using non-linear scale, for example a logarithmic or a power function. pfsglview
       offers several such scales, shown in popup 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.

EXAMPLES

       pfsin memorial.hdr | pfsglview
	      See the memorial image.

       pfsin memorial.hdr | pfsglview | pfsout memorial.jpg
	      See the memorial image and save the clipped (8-bits) version to memorial.jpg (Save&Quit option from popup menu should be activated).

SEE ALSO

       pfsin(1)

       Please report bugs and comments to Radoslaw Mantiuk <radoslaw.mantiuk@gmail.com>.

																      pfsglview(1)