1\ 2.\" This man page was generated by the Netpbm tool 'makeman' from HTML source. 3.\" Do not hand-hack it! If you have bug fixes or improvements, please find 4.\" the corresponding HTML page on the Netpbm website, generate a patch 5.\" against that, and send it to the Netpbm maintainer. 6.TH "Ppmflash User Manual" 0 "26 January 2003" "netpbm documentation" 7 8.UN lbAB 9.SH NAME 10ppmflash - brighten a picture to approach white 11 12.UN lbAC 13.SH SYNOPSIS 14ppmflash 15\fIflashfactor\fP 16[\fIppmfile\fP] 17 18.UN lbAD 19.SH DESCRIPTION 20.PP 21This program is part of 22.BR "Netpbm" (1)\c 23\&. 24.PP 25\fBppmflash\fP reads a PPM image as input. It changes the color of 26each pixel to bring it a specified amount closer to white. It 27generates a PPM image of the result. 28.PP 29\fIflashfactor\fP is a real number between 0 and 1, inclusive. 30\fBppmflash\fP increases the intensity of each RGB component by the 31fraction \fIflashfactor\fP of the difference between the current 32value and full intensity. So if a pixel contains 60% full red, 10% 33full green, and no blue and you specify 0.5 (half), \fBppmflash\fP 34increases the red to 80% (because it was 40% from full intensity, so 35it adds half of 40% to the original 60%), the green to 55%, and the 36blue to 50%. 37.PP 38If \fIflashfactor\fP is zero, the output is identical to the input. 39If \fIflashfactor\fP is one, the output is all white. 40.PP 41\fBpambrighten\fP does a more normal kind of brightening. 42\fBpamfunc\fP does a very simple brightening. Both 43\fBpambrighten\fP and \fBpamfunc\fP can reduce brightness as well. 44.PP 45\fBpnmgamma\fP is another way people do a similar brightening, though 46it isn't really intended for that. 47 48.UN lbAE 49.SH SEE ALSO 50.BR "pambrighten" (1)\c 51\& 52.BR "pamfunc" (1)\c 53\&, 54.BR "pnmgamma" (1)\c 55\&, 56.BR "ppm" (5)\c 57\&, 58 59.UN lbAF 60.SH AUTHOR 61 62Copyright (C) 1993 by Frank Neumann 63.SH DOCUMENT SOURCE 64This manual page was generated by the Netpbm tool 'makeman' from HTML 65source. The master documentation is at 66.IP 67.B http://netpbm.sourceforge.net/doc/ppmflash.html 68.PP