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Michele Bini committed 843638c

Add a README file.

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+photocrop - Perspective-correct photo cropping
+
+Photocrop is a perspective-correct photo cropping tool.
+
+It allows to interactively select and crop a portion of a photo,
+resnapping it from the newly selected center.
+
+Installation
+============
+Photocrop presently requires Povray for full operation, in addition to
+Perl, SDL and OpenGL.
+
+License
+=======
+
+Copyright (c) 2009, 2010, 2012 Michele Bini <michele.bini@gmail.com>
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the version 3 of the GNU General Public License
+as published by the Free Software Foundation.
+
+This program is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Usage
+=====
+
+Usage: $0 OPTIONS* image.jpg\n
+
+Options:
+  --angle ANGLE
+  --viewangle ANGLE     Initial angle of perspective view
+  --turn ANGLE          Initial right-side turn
+  --tilt ANGLE          Initial up-tilt
+  --rotation ANGLE      Initial image rotation
+  --viewrotation ANGLE  View rotation
+
+ANGLE: <decimal-number> <deg|rad>
+
+Saving options:
+  --savebmp FILE     Output a screenshot to FILE.
+  --savepovray FILE  Output a povray scene to FILE of the current view.
+
+Files are saved when the program exits.
+
+Scale detected angles:
+  --scaledetectedangle RATIO   Scale detected aperture angle by RATIO
+  --scaledetectedanglex RATIO  Same for the X coordinate
+  --scaledetectedangley RATIO  Same for the Y coordinate
+
+Diagnostic options:
+  --verbose  Verbose operation
+  --debug    Debug program
+
+Interface options:
+  --screensize WxH  Set window/screen size
+  --noscreenresize  Don't allow window resize
+  --rungimp         Run gimp on generated file
+  --delay MS        Delay frames MS milliseconds
+  --fullscreen      Use full screen display
+  --[no-]crosshair  [De]Activate a blinking, angle measuring crosshair
+  --[no-]buttons    [De]Activate button interface (default: on).
+
+Animation options:
+  --notile     Do not tile main texture! (may fail on some systems)
+  --texdim S   Use size S for texture tiles (future option)
+  --quality N  Set rendering quality (0..10, default 8)
+
+Keyboard input:
+(a, z):  Zoom (in, out)
+(c, w):  Rotate image (clockwise, counterclockwise)
+Arrow keys: tilting
+RETURN:  Write output file[s] and exit
+ESCAPE:  Abort program
+
+Output:
+  --scaleup X        Scales up X times the image rendered by povray
+  --savepng FILE     Save to file the view rendered with povray
+  --savebmp FILE     Save displayed image to file on exit (low quality, not recommended)
+  --savepovray FILE  Save to povray file on exit