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pnminterp (1)
>> pnminterp (1) ( Разные man: Команды и прикладные программы пользовательского уровня )
NAME
pnminterp - scale up portable anymap by interpolating between pixels.
SYNOPSIS
pnminterp
[-blackedge]
[-dropedge]
N
[pnmfile]
You can use the minimum unique abbreviation of the options.
DESCRIPTION
Pnminterp scales up pictures, producing output with one
NxN
pixel for each pixel in the original image. Where pnminterp improves
over using pnmscale/pnmenlarge for this is that it interpolates
between pixels, producing better-looking output.
To scale up to non-integer pixel sizes, e.g. 2.5, try
pnminterp-gen(1)
instead.
OPTIONS
The options let you select alternative methods
of dealing with the right/bottom edges of the picture. Since the
interpolation is done between the top-left corners of the scaled-up
pixels, it's not obvious what to do with the right/bottom edges. The
default behaviour is to scale those up without interpolation (more
precisely, the right edge is only interpolated vertically, and the
bottom edge is only interpolated horizontally), but there are two
other possibilities, listed below.
-blackedge
interpolate to black at right/bottom edges.
-dropedge
drop one (source) pixel at right/bottom edges. This is arguably more
logical than the default behaviour, but it means producing output
which is a slightly odd size.
BUGS
Usually produces fairly ugly output for PBMs. For most PBM input
you'll probably want to reduce the `noise' first using something like
pnmnlfilt(1).
Always produces images with a maxval of 255, which may lose sample
resolution if the input is (say) a 16-bit PGM.
