diff options
| author | giraffedata <giraffedata@9d0c8265-081b-0410-96cb-a4ca84ce46f8> | 2022-08-16 01:22:28 +0000 |
|---|---|---|
| committer | giraffedata <giraffedata@9d0c8265-081b-0410-96cb-a4ca84ce46f8> | 2022-08-16 01:22:28 +0000 |
| commit | 3f5173528a7f3e0dc237db27544e889b9282ff41 (patch) | |
| tree | 2aae33f70b0c0efbf4fd4984575e8937929eeb8a /pnmcat.html | |
| parent | 3784d1001822c2450b1b3b6efb11df5db554c515 (diff) | |
| download | netpbm-mirror-3f5173528a7f3e0dc237db27544e889b9282ff41.tar.gz netpbm-mirror-3f5173528a7f3e0dc237db27544e889b9282ff41.tar.xz netpbm-mirror-3f5173528a7f3e0dc237db27544e889b9282ff41.zip | |
miscellaneous update
git-svn-id: http://svn.code.sf.net/p/netpbm/code/userguide@4412 9d0c8265-081b-0410-96cb-a4ca84ce46f8
Diffstat (limited to 'pnmcat.html')
| -rw-r--r-- | pnmcat.html | 66 |
1 files changed, 8 insertions, 58 deletions
diff --git a/pnmcat.html b/pnmcat.html index 15aa8d83..5ccdc614 100644 --- a/pnmcat.html +++ b/pnmcat.html @@ -2,7 +2,7 @@ <html><head><title>Pnmcat User Manual</title></head> <body> <h1>pnmcat</h1> -Updated: 30 July 2022 +Updated: 13 August 2022 <h2>NAME</h2> @@ -12,65 +12,15 @@ pnmcat - replaced by pamcat <p>This program is part of <a href="index.html">Netpbm</a>. -<p><b>pnmcat</b> was obsoleted by <a href="pamcat.html"><b>pamcat</b></a>, -introduced with Netpbm 11.00 (September 2022). <b>pamcat</b> is almost -backward compatible with <b>pnmcat</b>, plus adds many additional functions, -including the ability to process PAM images. - -<p>These are the ways in which <b>pamcat</b> is not backward compatible with - <b>pnmcat</b>: - - <ul> - <li><b>pamcat</b> produces PAM output, whereas <b>pnmcat</b> produces PNM. - With <b>pamcat</b>, If your inputs are PNM and you want PNM output, you - can run the output through <b>pamtopnm</b>. But most Netpbm programs - that take PNM input can just as well take the PAM input, so this may not - be necessary. - - <li><b>pnmcat</b> recognizes PBM, PGM, and PPM input images as visual - images and makes sure the images are the same in the concatenated - outputs even though the output may be a different format. For example, - if you are concatenating PBM image foo.pbm and PPM image bar.ppm, the - resulting image will be PPM and the foo part of it will have the same - black and white pixels as the foo.pbm input. - - <p><b>pamcat</b>, on the other hand, work on generic PAM images and does - not really recognize colors. It sees a PBM input as a 1-plane image - and a PPM input as a 3-plane image and produces a 3-plane output - image. By default, in the example above, the foo part of the output - contains the black and white sample values in its first plane, but - zeroes in its second and third planes, which means if you take the - output image to be a PPM-like color visual image, the foo part is - black and red instead of black and white. - - <p>But this is easy to fix. Use the <b>-extendplane</b> option to say - instead of making those additional planes zero, make them copies of - the first plane. So the three panes in the foo part of the output - image will all contain the same sample values as the single plane of - the PBM input, which means if you use the output image as a color - image, those pixels are black and white. - </ul> - -<p>For full backward compatibility, <b>pnmcat</b> remains in Netpbm, - implemented as a simple wrapper of <b>pamcat</b>. For the fewest problems - with future releases of Netpbm, you should not use <b>pnmcat</b> in any - new work. - - -<h2>Using pnmcat in old Netpbm</h2> +<p><b>pnmcat</b> was obsoleted by <a +href="pamcat.html"><b>pamcat</b></a>, introduced with Netpbm 11.00 +(September 2022). <b>pamcat</b> is backward compatible with <b>pnmcat</b>, +plus adds many additional functions, including the ability to process PAM +images. <p>In Netpbm before 11.00, use the manual for <b>pamcat</b> with -<b>pnmcat</b>, observing the following differences: - -<ul> - <li><b>pnmcat</b> accepts only PNM input (i.e. PBM, PGM, or PPM) - and produces only PNM output. The output is the highest format - (PBM, PGM, PPM) of any of its inputs. - - <li>Features that the manual says were added to <b>pamcat</b> - in Release 11.00 or later are not there. -</ul> - +<b>pnmcat</b>. Features that are in <b>pamcat</b> but not <b>pnmcat</b> +are indicated by statements that they didn't exist before 11.00. </body> </html> |