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diff --git a/index.html b/index.html index 2bc367c2..2b4902a8 100644 --- a/index.html +++ b/index.html @@ -13,8 +13,8 @@ Updated: 31 January 2014 <P><B>Netpbm</B> is a package of graphics programs and a programming library. <P> There are over 220 separate programs in the package, -most of which have "pbm", "pgm", "ppm", -"pam", or "pnm" in their names. For example, +most of which have "pbm", "pgm", "ppm", +"pam", or "pnm" in their names. For example, <B><a href="pamscale.html">pamscale</a></B> and <B><a href="giftopnm.html">giftopnm</a></B>. @@ -178,7 +178,7 @@ ls *.yuv <B>xargs</B> are also useful for simple manipulation of groups of files. <P> -Some shells' "process substitution" facility can help where a +Some shells' "process substitution" facility can help where a non-Netpbm program expects you to identify a disk file for input and you want it to use the result of a Netpbm manipulation. Say the hypothetical program <b>printcmyk</b> @@ -200,7 +200,7 @@ Netpbm tool. <P> All of the programs work with a set of graphics formats called the -"netpbm" formats. Specifically, these formats are +"netpbm" formats. Specifically, these formats are <A HREF="pbm.html">pbm</A>, <A HREF="pgm.html">pgm</A>, <A HREF="ppm.html">ppm</A>, @@ -208,7 +208,7 @@ and <A HREF="pam.html">pam</A>. The first three of these are sometimes known generically as -"pnm". +"pnm". Many of the Netpbm programs convert from a Netpbm format to another format or vice versa. This is so you can use the Netpbm programs to @@ -227,9 +227,9 @@ it can represent matrices of general data including but not limited to black and white, grayscale, and color images. <P> -Programs designed to work with PBM images have "pbm" in their names. +Programs designed to work with PBM images have "pbm" in their names. Programs designed to work with PGM, PPM, and PAM images similarly have -"pgm", "ppm", and "pam" in their names. +"pgm", "ppm", and "pam" in their names. <P> All Netpbm programs designed to read PGM images see PBM images as if @@ -237,8 +237,8 @@ they were PGM too. All Netpbm programs designed to read PPM images see PGM and PBM images as if they were PPM. See <a href="#impconv"> Implied Format Conversion</a>. -<P> Programs that have "pnm" in their names read PBM, PGM, -and PPM but unlike "ppm" programs, they distinguish between +<P> Programs that have "pnm" in their names read PBM, PGM, +and PPM but unlike "ppm" programs, they distinguish between those formats and their function depends on the format. For example, <B><a href="pnmtopng.html">pnmtopng</a></B> creates a black and white PNG output image if its input is PBM or PGM, but a color PNG output image @@ -315,7 +315,7 @@ PBM program to read a PAM image, run it through <b>pamtopnm</b>. <P>In many graphics formats, there's a means of indicating that certain parts of the image are wholly or partially transparent, meaning that -if it were displayed "over" another image, the other image +if it were displayed "over" another image, the other image would show through there. Netpbm formats deliberately omit that capability, since their purpose is to be extremely simple. @@ -416,7 +416,7 @@ to totally describe the pixel. Netpbm does this expansion to make implementing the programs easier -- it uses the same format regardless of the type of image. -<p>Newer programs use the "pam" family of library functions +<p>Newer programs use the "pam" family of library functions internally, which use memory a little differently. These functions are designed to handle generic tuples with a variable numbers of planes, so no fixed size per-tuple storage is possible. A program of this type uses 4 bytes @@ -507,7 +507,7 @@ href="pamditherbw.html"><b>pamditherbw</b></a> (Make a black and white image that approximates a grayscale image). <p>The Netpbm image formats use 16 bit integers. The Netpbm code uses -"unsigned int" size integers to work with them. +"unsigned int" size integers to work with them. <H2 id="netpbmforgimp">Netpbm For Gimp</H2> @@ -640,7 +640,7 @@ are specifically for KDE. <P>If you're writing a program in C to draw and manipulate images, check out <a href="http://www.boutell.com/gd">gd</a>. Netpbm contains a C library for -drawing images (<b>libnetpbm</b>'s "ppmd" routines), but it is +drawing images (<b>libnetpbm</b>'s "ppmd" routines), but it is probably not as capable or documented as <b>gd</b>. You can easily run any Netpbm program from a C program with the <b>pm_system</b> function from the Netpbm programming library, but that is less efficient than <b>gd</b> @@ -736,7 +736,7 @@ available). This can convert from TIFF -> IOCA and back again. <a href="http://www.thethinktanksoftware.com/details.html">Ameri-Imager</a> ($40 Windows only). -<P><B>pnm2ppa</B> converts to HP's "Winprinter" format (for +<P><B>pnm2ppa</B> converts to HP's "Winprinter" format (for HP 710, 720, 820, 1000, etc). It is a superset of Netpbm's <B>pbmtoppa </B> and handles, notably, color. However, it is more of a printer driver than a Netpbm-style primitive graphics building @@ -775,11 +775,11 @@ purposes the quintessential Postscript and PDF tools. <P>Adobe's free Acrobat Reader displays PDF and converts to Postscript. The Acrobat Reader for unix has a program name of -"acroread" and the -toPostScript option (also see the +"acroread" and the -toPostScript option (also see the -level2 option) is useful. <P>Other software from Adobe, available for purchase, interprets and -creates Postscript and PDF files. "Distill" +creates Postscript and PDF files. "Distill" is a program that converts Postscript to PDF. <p><a href="http://www.foolabs.com/xpdf/"><b>xpdf</b></a> also reads @@ -962,7 +962,7 @@ http://www.openexr.com</a>. <li>Xv Visual Schnauzer thumbnail image. This is a rather antiquated format used by the Xv program. In Netpbm circles, it is best known for the fact that it is very similar to Netpbm formats and uses the -same signature ("P7") as PAM because it was developed as +same signature ("P7") as PAM because it was developed as sort of a fork of the Netpbm format specifications. <li>YUV 4:2:0, aka YUV 420, and the similar YUV 4:4:4, YUV 4:2:2, |