pnmmontage(1) [debian man page]
pnmmontage(1) General Commands Manual pnmmontage(1) NAME
pnmmontage - create a montage of portable anymaps SYNOPSIS
pnmmontage [-?|-help] [-header=headerfile] [-quality=n] [-prefix=prefix] [-0|-1|-2|...|-9] pnmfile... DESCRIPTION
Packs images of differing sizes into a minimum-area composite image, optionally producing a C header file with the locations of the subim- ages within the composite image. OPTIONS
-?, -help Displays a (very) short usage message. -header Tells pnmmontage to write a C header file of the locations of the original images within the packed image. Each original image gen- erates four #defines within the packed file: xxxX, xxxY, xxxSZX, and xxxSZY, where xxx is the name of the file, converted to all uppercase. The #defines OVERALLX and OVERALLY are also produced, specifying the total size of the montage image. -prefix Tells pnmmontage to use the specified prefix on all of the #defines it generates. -quality Before attempting to place the subimages, pnmmontage will calculate a minimum possible area for the montage; this is either the total of the areas of all the subimages, or the width of the widest subimage times the height of the tallest subimage, whichever is greater. pnmmontage then initiates a problem-space search to find the best packing; if it finds a solution that is (at least) as good as the minimum area times the quality as a percent, it will break out of the search. Thus, -q 100 will find the best possible solution; however, it may take a very long time to do so. The default is -q 200. -0, -1, ... -9 These options control the quality at a higher level than -q; -0 is the worst quality (literally pick the first solution found), while -9 is the best quality (perform an exhaustive search of problem space for the absolute best packing). The higher the number, the slower the computation. The default is -5. NOTES
Using -9 is excessively slow on all but the smallest image sets. If the anymaps differ in maxvals, then pnmmontage will pick the smallest maxval which is evenly divisible by each of the maxvals of the original images. SEE ALSO
pnmcat(1), pnmindex(1), pnm(5), pam(5), pbm(5), pgm(5), ppm(5) AUTHOR
Copyright (C) 2000 by Ben Olmstead. 31 December 2000 pnmmontage(1)
Check Out this Related Man Page
pnmcomp(1) General Commands Manual pnmcomp(1) NAME
pnmcomp - composite (overlay) two portable anymap files together SYNOPSIS
pnmcomp [-xoff=X | -align={left,center,right}] [-yoff=Y | -valign={top,middle,bottom}] [-alpha=alpha-pgmfile] [-invert] overlay [pnm-input] [pnm-output] Minimum unique abbreviations are acceptable. DESCRIPTION
pnmcomp reads two images and produces a composite image with one of the images overlayed on top of the other. The images need not be the same size. The input and outputs are PNM format image files. In its simplest use, pnmcomp simply places the overlay file on top of the pnm-input file, blocking out the part of the pnm-input file beneath it. If you specify the alpha-pgmfile, pnmcomp uses it as an alpha mask, which means it determines the level of transparency of each point in the overlay image. The alpha mask must have the same dimensions as the overlay image. In places where the alpha mask defines the overlay image to be opaque, the composite output contains only the contents of the overlay image; the underlying image is totally blocked out. In places where the alpha mask defines the overlay image to be transparent, the composite output contains none of the overlay image; the underlying image shows through completely. In places where the alpha mask shows a value in between opaque and transpar- ent (translucence), the composite image contains a mixture of the overlay image and the underlying image and the level of translucence determines how much of each. The alpha mask is a PGM file in which a white pixel represents opaqueness and a black pixel transparency. Anything in between is translu- cent. In some image file formats (PNG, for example), transparency information (the alpha mask) is part of the definition of the image. In the PNM formats, transparency is always embodied in a separate companion file. The PNM converter programs that convert from an image format such as PNG have options that allow you to extract the transparency information to a separate file, which you can then use as input to pnm- comp. The output image is always of the same dimensions as the underlying image. pnmcomp only uses parts of the overlay image that fit within the underlying image. To specify where on the underlying image to place the overlay image, use the -xoff, -yoff, -align, and -valign options. Without these options, the default horizontal position is flush left and the default vertical position is flush top. The overlay and underlying images may be of different formats (e.g. overlaying a PBM text image over a full color PPM image) and have dif- ferent maxvals. The output image has the more general of the two input formats and a maxval that is the least common multiple the two max- vals (or the maximum maxval allowable by the format, if the LCM is more than that). OPTIONS
-invert This option inverts the sense of the values in the alpha mask, which effectively switches the roles of the overlay image and the underlying image in places where the two intersect. -xoff X -yoff Y These options position the overlay image with respect to the underlying image. X and Y are the horizontal and vertical displace- ments of the top left corner of the overlay image from the top left corner of the underlying image, in pixels. A positive value means right or down; a negative value means left or up. The overlay need not fit entirely (or at all) on the underlying image. pnmcomp uses only the parts that lie over the underlying image. -align=[left,center,right] This option is an alternative to -xoff, in the style of HTML. It selects the horizontal position of the overlay image so that it is flush left, centered, or flush right on the underlying image. -valign=[top,middle,bottom] This option is an alternative to -yoff, in the style of HTML. It selects the vertical position of the overlay image so that it is flush top, centered, or flush bottom on the underlying image. SEE ALSO
ppmmix(1) and pnmpaste(1) are simpler, less general versions of the same tool. pnm(5), pbmmask(1) AUTHOR
Copyright (C) 1992 by David Koblas (koblas@mips.com). 12 April 2000 pnmcomp(1)