| Linux / Unix Command: ppmtoacad |
NAME
ppmtoacad - convert portable pixmap to AutoCAD database or slideSYNOPSIS
ppmtoacad [-dxb] [-poly] [-background colour] [-white] [-aspect ratio] [-8] [ppmfile]DESCRIPTION
Reads a portable pixmap as input. Produces an AutoCAD® slide file or binary database import (.dxb) file as output. If no ppmfile is specified, input is read from standard input.OPTIONS
- -dxb
- An AutoCAD binary database import (.dxb) file is written. This file is read with the DXBIN command and, once loaded, becomes part of the AutoCAD geometrical database and can be viewed and edited like any other object. Each sequence of identical pixels becomes a separate object in the database; this can result in very large AutoCAD drawing files. However, if you want to trace over a bitmap, it lets you zoom and pan around the bitmap as you wish.
- -poly
- If the -dxb option is not specified, the output of ppmtoacad is an AutoCAD slide file. Normally each row of pixels is represented by an AutoCAD line entity. If -poly is selected, the pixels are rendered as filled polygons. If the slide is viewed on a display with higher resolution than the source pixmap, this will cause the pixels to expand instead of appearing as discrete lines against the screen background colour. Regrettably, this representation yields slide files which occupy more disc space and take longer to display.
- -background colour
- Most AutoCAD display drivers can be configured to use any available colour as the screen background. Some users perfer a black screen background, others white, while splinter groups advocate burnt ocher, tawny puce, and shocking grey. Discarding pixels whose closest AutoCAD colour representation is equal to the background colour can substantially reduce the size of the AutoCAD database or slide file needed to represent a bitmap. If no -background colour is specified, the screen background colour is assumed to be black. Any AutoCAD colour number may be specified as the screen background; colour numbers are assumed to specify the hues defined in the standard AutoCAD 256 colour 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.
- -aspect ratio
- If the source pixmap had non-square pixels, the ratio of the pixel width to pixel height should be specified as ratio. The resulting slide or .dxb file will be corrected 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 colours in the output file to the 8 RGB shades.
All flags can be abbreviated to their shortest unique prefix.
SEE ALSO
AutoCAD Reference Manual: Slide File Format and Binary Drawing Interchange (DXB) Files, ppm(5)Important: Use the man command (% man) to see how a command is used on your particular computer.
