Accurately output image files from AutoCAD (zz)

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SlaveAutoCADPrecise output of image files

 

AutoCAD Slave R14 At the beginning of the version, the output function of large-format Raster image files was added. The new function has two major meanings: First, it facilitates the printing and output of design results, and most of the friends who do not have large-format printers, set your own DWG After the file is converted to a common image file, you can get the output from any printer without having to require the other computer to have AutoCAD R14 Software. Second, make full use AutoCAD The convenience of the auxiliary design function allows you to precisely design large images in the early stage. The key and difficulty for using this function is how to accurately AutoCAD Image output is an image file. The following describes how to use this function.

 

Set the image file printing and output driver

 

1. in AutoCAD R14 menu" tools (Tool) column, choose preferences (Parameter Select), and select printer (printer )".

 

2 . Printer "There is an operation button on the left side of the interface, and select" New (New), a" Add a printer (Add Printer) "dialog box, move the" Available Printer Drivers (Printer driver available) "vertical scroll bar in the list box, select" Raster File Export addi 4.3 (Raster image output drive), click the mouse (note that it is best not to double-click the mouse, because you still need to Add a description "In the column, enter a brief description of the name nature for the image print output driver you are about to create to distinguish it from other printing output devices.), click OK and then select" OK ".

 

3 . Supported models: ", The maximum number of points of the output image should be determined, so the" 11 "Item:" User - Defined (User-Defined )". The largest custom image is 8000 × 8000 Point, then the input width and height value should be within this limit, and then in BMP , TGA , PCX , Tiff Select one of the four formats as the output image format. After determining the image format, you must specify the color type of the output image.

 

4The next question is important, that is, let you select the background color of the output image. The default value is0, Indicating black. Black is the background color of the image. It is not only the printing time, but also not suitable for the use of the image. The white image bottom is more natural, and the input value7The white basemap.

 

5 After the above settings are complete, the system will prompt a default parameter and ask you" Do you want to change anything? (No/Yes/file) ", To determine whether to change them, enter" Y "To modify some parameters. For example, in the unit of dimensions, the input millimeter is more in line with Chinese habits. Enter the size or width, height (in millimeters ): ", It is best to press enter to select the default settings Max . If you select A1 , A0 Image, you will be fooled, because here A0 The image size is measured in millimeters, while the image size is measured in DOTS. Therefore, the image output space is greatly reduced. All other settings can be processed by default. The last question is" Plotted millimeters = drawing units or fit or? It is very important to determine the scale of the image, that is, the number of points per inch, is actually the resolution of the image, if you want the image 360 DPI Enter a number here. 360 . Now, everything can be" OK .

 

Settings when printing and outputting an image file

 

1. There is another opportunity to change this number after printing is started. When printing, Print/plot Configuration In the dialog box 360 DPI The corresponding number is" 14.1732 " To change to another scale, that is, to use different resolutions, you can change the" Plotted pixels = drawing units . For example 6000 DPI , You need to 14.1732 " Change 23.622 , This

 

 

The number is the number of points per millimeter.DPIIn addition to one25.4.

 

2. The first thing to do when printing is, of course, do not forget to Device and default information Select the image driver you just set. In the Additional Parameters "Pay attention to the following two settings: one is to select" File Name ", Give the image a file name; second, it is best to use" Window... "To select the output image area, because 8000 Point 360 DPI The resolution length is 56.4 , Only equivalent A2 The Valid Width of the image. Therefore, you can use a window to select an output area to control the output image width within the valid area. In addition, you can also split the output to splice large images.

 

UsePhotoshopAnd other image processing software to complete subsequent work

 

1. autoCAD the default resolution of the output image file is 72 dpi , in Photoshop in image processing software, the resolution is adjusted to the one set during output printing, in this way, the size of the output image can be precisely guaranteed. In Photoshop in the" image "menu, select" image size "to adjust the resolution, the selection before "Reset image pixels" should be cleared so that the print size remains unchanged when the resolution is adjusted to conform to the designed size.

 

2. Compression storage. AutoCAD The output image file is non-compressed and occupies a large space. Because CAD The color hierarchy of the image is small, and the output image has a large compression space, so it is worth Photoshop Such image processing software is stored in lossless compression mode, such as 41.2 MB TIF Format topographic map. When saving an image, select LZW Only 2.6 MB. So far AutoCAD