1Pamtotga User Manual(0) Pamtotga User Manual(0)
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6 pamtotga - convert a Netpbm image to a TrueVision Targa file
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10 pamtotga [-mono|-cmap|-rgb] [-norle] [pamfile]
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15 This program is part of Netpbm(1).
16 pamtotga reads a PBM, PGM, PPM, or PAM image as input and produces a
18 TrueVision Targa file as output. The PAM image may be either a
19 BLACKANDWHITE, GRAYSCALE, RGB, or RGB_ALPHA image.
20 To create a TGA image with transparency (i.e. with an alpha mask), use
22 RGB_ALPHA PAM input. Some Netpbm programs that generate images with
23 alpha masks generate them in that format. For another way to create
24 the proper input stream, see pamstack(1).
25 It is unclear that anything except pamtotga knows about TGAs with
27 transparency. The history behind this feature of pamtotga is not
28 clear. The format pamtotga produces is simply the same as an ordinary
29 RGB TGA image except with a 4th plane added for transparency. The Pix‐
30 elSize field of the TGA header specifies 32 bits instead of 24 and the
31 raster has an extra byte added to each pixel, at the tail end. The
32 value of that byte has the same meaning as in a PAM image with maxval
33 255.
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37 All options can be abbreviated to their shortest unique prefix. You
38 may use two hyphens instead of one to designate an option. You may use
39 either white space or equals signs between an option name and its
40 value.
41 -cmap Make output Targa file of type 24 bit colormapped. Input must
45 contain no more than 256 distinct colors.
46 -mono Make output Targa file of type 8 bit monochrome. Input must be
49 PBM or PGM or a PAM with BLACKANDWHITE or GRAYSCALE tuple type.
50 See -cmap.
51 You may specify at most one of -mono, -cmap, and -rgb. If you
53 specify neither, the default image type is the most highly con‐
54 strained compatible type is used, where monochrome is more con‐
55 strained than colormapped which is in turn more constrained than
56 unmapped.
57 -rgb Make output Targa file of type 24 bit unmapped color. See
60 -cmap.
61 -norle Do not use run-length encoding in the output Targa file. Run-
64 length encoded files are smaller, but Some Targa readers can't
65 read run-length encoded files.
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71 tgatoppm(1), pnmquant(1), pamstack(1), pam(1) pnm(1)
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75 This program was called ppmtotga until Netpbm 10.6 (July 2002). That
76 was always a misnomer, though, because a PPM class program would not be
77 able to tell the difference between PGM and PPM input (it would all
78 look like PPM), and thus could not choose the output Targa image type
79 based on the type of the input. Netpbm 10.6 also added the ability to
80 handle an alpha channel, so it became a PAM class program.
81 In Netpbm 10.15 (April 2003), the program became the first in the
83 Netpbm package to recognize an alpha channel in a PAM. It recognized
84 tuple type 'RGBA'. But when this kind of PAM image was later added to
85 the PAM specification, it was specified with tuple type 'RGB_ALPHA'.
86 So in Netpbm 10-26 (January 2005), pamtotga changed to recognize
87 'RGB_ALPHA' instead of 'RGBA'.
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91 Copyright (C) 1989, 1991 by Mark Shand and Jef Poskanzer.
92netpbm documentation 21 July 2002 Pamtotga User Manual(0)