Pamscale User Manual(0) Pamscale User Manual(0) (NAME) pamscale - Netpbm (SYNOPSIS) pamscale [ scale_factor | {-xyfit | -xyfill | -xysize} cols rows | -reduce reduction_factor | [-xsize=cols | -width=cols | -xscale=factor] [-ysize=rows | -height=rows | -yscale=factor] | -pixels n ] [ -nomix | -filter=functionName [-window=functionName] ] [-linear] [-reportonly] [-verbose] [pnmfile] . . (white space) . (DESCRIPTION) Netpbm(1) . pamscale Netpbm . ( > ) ( < ) . pamscale (multi-image streams) . Netpbm 10.49 ( ) . (The Scale Factors) -width -height -xsize -ysize -xscale -yscale -xyfit -xyfill -reduce -pixels . -xysize scale_factor . -width -height . . -xsize -ysize -width -height . -xscale -yscale ( -xscale 2 -xscale .5 ). . pamscale (aspect ratio) . pamscale . pamscale . scale_factor . : -xscale=scale_factor -yscale=scale_factor. -reduce reduction_factor scale_factor scale_factor reduction_factor . -xyfit (bounding box) . pamscale . -xysize . Netpbm 10.20 ( ) -xyfit -xysize . -xyfill pamscale . Netpbm 10.20 ( ) . -pixels . pamscale . pamscale pamscale -pixels . pnmsmooth . -reportonly -reportonly pamscale . : -xyfill 100 100 -reportonly pamscale . pamscalefixed pamscale . . : 500 400 0.250000 0.250000 125 100 : o o o o o o -reportonly Netpbm 10.86 ( ) . pamscale (blur) . ( -nomix) pamstretch . pamscale <<>> . (Transparency) pamscale . . PAM ( PAM ) ( ) . PAM . (full) . ( ) ( ). (Input And Output Image Types) pamscale ( PAM tuple type) PBM . PGM maxval . . PAM . PAM BLACKANDWHITE PAM BLACKANDWHITE . PBM PBM pamditherbw pamscale PBM . pbmreduce . pamscale PAM RGB GRAYSCALE BLACKANDWHITE _ALPHA . ( Netpbm PBM PGM PPM ). (gamma-adjusted) pamscale . (transparency plane) . pamscale ( -linear ) . (Methods Of Scaling) . pamscale . (Pixel Mixing) pamscale . . . . . . . 100x200 1.5 . . - . / / / / . . . . . . . . . . (Discrete Sampling) . . . . . 1.5 . . . -nomix pamscale . -nomix . - . . pamscale : GIF . GIF PPM .625 GIF GIF . . GIF pnmquant . ( ) -- N . pamscale pamstretch . pamscale pamenlarge . pamenlarge . (-nomix) Netpbm 9.24 ( ) . (Resampling) . . . ( ) . . . -filter pamscale . ..PP (resampling) -- (grayscale). : . pamscale . . (filter function) -filter (convolve) . . . . : ( ) . . . . . ( ) . () . . . . F R F R . R pamscale pamscale . : : sinc. sinc sinc(x) = sin(PI*x)/PI*x . -filter=sinc . (Refiltering) : . (aliasing) . (scaling up ) . (scaling down) . aliasing . . pamscale . (Approximations) pamscale . -- . pamscale . . . . sinc . . sinc . sinc (window function) -window . sinc . Blackman . Hanning Hamming Kaiser . Sinc (Filter Functions Besides Sinc) sinc . pamscale . sinc . . . sinc : (impulse filter) -- . . ( box filter) (piecewise linear) . . (pixel mixing) ( pamscale -linear) (interpolation pamstretch) . (Gamma) pamscale ( ) PNM PAM . -linear ( pamscale ) . (-filter) Netpbm 10.20 ( ) . (The filter and window functions) -filter -window . . . . point X=0 Y=1 . box X Y . triangle X Y . quadratic cubic catrom mitchell gauss sinc bessel hanning.TP hamming blackman kaiser normal hermite lanczos (Linear vs Gamma-adjusted) ( ). PNM PAM . pamscale . PNM PAM . -linear pamscale . pamscale . . . . -linear PPM PPM . Netpbm Netpbm 10.20 ( ) pamscale pnmscale PPM . -linear . -nomix pnmscalefixed . PNM pnmgamma pamscale PNM PNM pnmgamma -ungamma . pnmgamma pamscale . -nomix -linear pamscale . (Precision) pamscale . ( ) pnmscalefixed . pnmscalefixed . pnmscalefixed . (OPTIONS) libnetpbm ( -quiet (Common Options) ) pamscale : -width -height -xsize -ysize -xscale -yscale -xyfit -xyfill -reduce -pixels -xysize . (The Scale Factors) <#scalefactor> . -reportonly pamscale . -reportonly <#reportonly> . -nomix (discrete sampling) <#sampling> <#methods> . -filter=functionName (resampling) <#resampling> <#methods> . -window=functionName -filter . (Resampling) <#resampling> . -verbose pamscale . pnmscalefixed(1), pamstretch(1), pamstretch-gen(1), pamditherbw(1), pbmreduce(1), pbmpscale(1), pamenlarge(1), pnmsmooth(1), pamcut(1), pnmgamma(1), pnmscale(1), pnm(1), pam(1) (HISTORY) pamscale Netpbm 10.20 ( ) . pnmscale ( ). pamscale pnmscale PAM <> Netpbm . (resampling) . ( ) pnmscale . pnmscale -linear . Adam M Costello . Michael Reinelt . pnmscale pamscale Pbmplus pnmscale Jef Poskanzer ( ) . (DOCUMENT SOURCE) 'makeman' Netpbm HTML . : http://netpbm.sourceforge.net/doc/pamscale.html netpbm documentation 29 June 2020 Pamscale User Manual(0)