PPMTOACAD(1)

💖 Ppmtoacad User Manual(1) 💖

ok so bestie, welcome to the Ppmtoacad User Manual, part of the General Commands Manual situation. buckle up, this one's a lil vintage but she SERVES 💅

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✨ NAME ✨

ppmtoacad — convert PPM to Autocad database or slide 🎨

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🦋 SYNOPSIS 🦋

ppmtoacad
    [-dxb]
    [-poly]
    [-background color]
    [-white]
    [-aspect ratio]
    [-8]
    [ppmfile]

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🌸 DESCRIPTION 🌸

okay so first thing, this program is literally part of Netpbm(1). she's in the family, she belongs. 🫶

ppmtoacad reads a PPM image as input and produces an Autocad® slide file or a binary database import (.dxb) file as output. no big deal. just casually converting your pixels into CAD-land. ✨

and if you don't specify ppmfile? no stress, she just takes the input from Standard Input. she's flexible like that 💅

Typographical note, bestie, listen up: the name of Autocad is often rendered as AutoCAD. Netpbm documentation uses standard American typography, wherein that is not a valid form of capitalization. so. there's that. 🙈

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👑 OPTIONS 👑

on top of the options common to all programs based on libnetpbm (most notably -quiet, see Common Options), ppmtoacad recognizes the following command line options:

also, you may abbreviate any option to its shortest unique prefix. iconic behavior, honestly 💅

• -dxb — ppmtoacad writes an Autocad binary database import (.dxb) file. you read this file with the DXBIN command and, once loaded, it becomes part of the Autocad geometrical database, so you can view and edit it like any other object. every sequence of identical pixels becomes a separate object in the database — and yeah, this can result in very large Autocad drawing files 😭. but if you want to trace over a bitmap, it lets you zoom and pan around the bitmap as you wish. main character energy for tracing, fr fr 🔥
• -poly — if you don't specify the -dxb option, ppmtoacad generates an Autocad slide file. normally each row of pixels is represented by an Autocad line entity. but if you specify -poly, ppmtoacad renders the pixels as filled polygons. if you view the slide on a display with higher resolution than the source image, this will cause the pixels to expand instead of appearing as discrete lines against the screen background color. regrettably 😔, this representation yields slide files which occupy more storage space and take longer to display. the tradeoff is real, bestie.
• -background color — okay so most Autocad display drivers can be configured to use any available color as the screen background. some users prefer a black screen background, others white, while splinter groups advocate burnt ocher, tawny puce, and shocking gray 💀. discarding pixels whose closest Autocad color representation is equal to the background color can substantially reduce the size of the Autocad database or slide file needed to represent a bitmap. if you don't specify -background, ppmtoacad assumes the screen background color to be black. you may specify any Autocad color number as the screen background; ppmtoacad assumes color numbers to specify the hues defined in the standard Autocad 256 color palette. 🌈
• -white — since many Autocad users choose a white screen background, this option is provided as a short-cut. specifying -white is identical in effect to -background 7. that's it, that's the whole thing. one number, no cap. ✨
• -aspect ratio — if the source image had non-square pixels (which means it is not standard PPM), specify the ratio of the pixel width to pixel height as ratio. ppmtoacad will correct the resulting slide or .dxb file so that pixels on the Autocad screen will be square. for example, to correct an image made for a 320x200 VGA/MCGA screen, specify -aspect 0.8333. 🦋
• -8 — restricts the colors in the output file to the 8 RGB shades. simple, clean, minimal. 🎀

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😭 RESTRICTIONS 😭

okay now the part where we're honest with each other.

Autocad has a fixed palette of 256 colors, distributed along the hue, lightness, and saturation axes. so it may poorly render images which contain many nearly-identical colors, or colors not closely approximated by Autocad's palette. it's giving ✨ limited range ✨.

ppmtoacad works best if the system displaying its output can display the full 256 color Autocad palette. monochrome, 8 color, and 16 color configurations will produce less than optimal results. ngl, don't do that to yourself. 🙈

when creating a .dxb file or a slide file with the -poly option, ppmtoacad finds both vertical and horizontal runs of identical pixels and consolidates them into rectangular regions to reduce the size of the output file. this is effective for images with large areas of constant color but it's no substitute for true raster to vector conversion. in particular, this process does not optimize thin diagonal lines at all. not even a little. 💀

Output files can be huge. like, HUGE huge. 📏

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🌈 SEE ALSO 🌈

• Autocad Reference Manual: Slide File Format and Binary Drawing Interchange (DXB) Files
• ppm(1)

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🫶 AUTHOR 🫶

John Walker Autodesk SA Avenue des Champs-Montants 14b CH-2074 MARIN Suisse/Schweiz/Svizzera/Svizra/Switzerland Usenet:kelvin@Autodesk.com Fax:038/33 88 15 Voice:038/33 76 33

Permission to use, copy, modify, and distribute this software and its documentation for any purpose and without fee is hereby granted, without any conditions or restrictions. This software is provided "as is" without express or implied warranty.

Autocad and Autodesk are registered trademarks of Autodesk, Inc.

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🧚 DOCUMENT SOURCE 🧚

This manual page was generated by the Netpbm tool makeman from HTML source. The master documentation is at

http://netpbm.sourceforge.net/doc/ppmtoacad.html

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and that's the whole page, bestie 💖 this one's from netpbm documentation, dated 10 October 1991 — yeah, she's vintage, she's an icon, she's still out here converting PPMs to Autocad like the queen she is 👑 periodt. 🎀✨