Rastering in autocad

Rastering in autocad DEFAULT

Modifying Your Image
Five different commands affect your raster images in the Modify pulldown menu. Select Modify =>Object=>Image and you'll find four of these five commands: Adjust, Quality, Transparency and Frame. Let's peruse these commands one at a time.

 

figure
Figure 1. The IMAGEADJUST dialog box lets you modify Brightness and Contrast, as well as how much the image will fade into the background.

Adjust
This option executes the IMAGEADJUST command. After selecting the raster image you want to adjust, the dialog box shown in Figure 1 displays on the screen (I'm on the right!).

Use this dialog much like you would the adjust options on your television set (that doesn't mean kicking it!). Using the three controls of Brightness, Contrast and Fade, you should be able to get the final picture you desire. Each property can have a value set between 0 and 100. As you adjust the values, you see the changes to the preview image update immediately within the dialog box; any modifications you make to the image in your drawing do not affect the original image file. (Note: Images that are Bitonal cannot be adjusted for brightness, contrast or fade; a Bitonal image consists of only a foreground and a background color. )

Brightness works hand in hand with Contrast. The higher the value, the brighter the image will become. You'll typically use Brightness to darken or lighten an image. You'll also find that the higher the setting, the more pixels will become white as you increase the Contrast setting.

Contrast controls the contrast of colors within the image. You might be able to use Contrast to make poor quality images easier to read. The higher the setting, the more you'll find that each pixel is forced to take on its primary or secondary color.

Fade controls how much the image fades into the background color. A setting of 100 will completely fade the image into the background. Should you change the screen background color-you'll find the image automatically adapts to the new color. When plotting, AutoCAD uses white as the fading color. Some users use Fade to create a watermark effect on a drawing or to make it easier to see vectors over raster images. Hitting the Reset button returns the values to the standard default of 50 for Brightness, 50 for Contrast and 0 for Fade. You can also access command-line-driven prompts of IMAGE
ADJUST by putting a dash in front of the command (-IMAGEADJUST).

Quality
The next command on our list is the IMAGEQUALITY command. This command can be used to speed up or slow down your drawing performance. High quality raster images take longer to display than those of draft quality. Note the command prompts for the IMAGEQUALITY command:

Command line: imagequality

High / Draft / <current> :

Setting the quality to Draft improves performance, and you'll notice the effect takes place immediately (without a dreaded regeneration). AutoCAD always plots using high quality so you don't need to worry about setting it back before plotting.

Transparency
The Third Command we'll discuss controls the transparency of your Raster images. It comes in handy should you want other objects to display through the raster image or through those pixels that are set to transparent. Not all images support this capability. Transparency can be used on Bitonal and Alpha RGB or grayscale images; it is specified by object, and images are inserted with transparency set to off by default.

In order to select an image for modification or clipping, the image frame must be ON (which brings us to the FRAME command). Selecting FRAME from the Modify =>Object =>Image pulldown menu executes the IMAGEFRAME command. You'll find that IMAGEFRAME is set to On by default and that this setting affects all raster images. Should you turn the frames off, the boundary edges will no longer be visible and your raster images will no longer be selectable.

 

figure
Figure 2. The Modify Image dialog box lets you modify image properties, parameters and display properties.
You can also access these four commands via the DDMODIFY command. Taking a look at Figure 2, you'll find the display controls on the right side of the dialog box. The Adjust Image button sends you to the Image Adjust dialog. Show Image permits you to turn off a raster image while keeping the boundary edge (thus improving your performance). We haven't covered Show Non-Ortho Image yet, and it doesn't reside in the pulldown menus. Should you have an image that isn't aligned with the current viewport, you can choose to turn the display off. Face it, raster images are 2D and don't display well in a 3D world. When Show Non-Ortho Image is selected, your raster images display regardless of your viewpoint. When it's not selected, you'll see the frame but no image when you leave the Plan view.

Show Clipped Image displays the clipped image when checked, the full image when not checked. Transparency is self-explanatory. You can only control the above settings on one image at a time via the DDMODIFY command.

Frame
The coolest of all the new image commands is IMAGECLIP. Previous to R14 we could only view entire image files. Now we have the power to clip and keep only the portion of the raster image we desire. This clipping can be reversed or modified at any time, so there's no fear of incorrect clipping. IMAGECLIP is located in the Modify pulldown menu under Objects. Let's review the options.

Command: IMAGECLIP

Select image to clip: pick the desired raster image

ON/OFF/Delete/<New boundary>:

The default option of New boundary is used to determine the clipping boundary. Accepting the default gives you this prompt:

Polygonal/<Rectangular>:

Rectangular prompts you for the two corners of a rectangle to be used to clip your raster image. Picking a point at the above prompt also assumes rectangular and only prompts you for the second corner. You'll also find that the rectangle is always drawn parallel to the edges of the image frame. Polygonal gives you more control as you can select many straight-line segments. These segments are not allowed to cross each other, or leave the image area. You'll find an Undo option available should you pick an incorrect point as well as a Close option. Surprise, surprise-you must have at least three points to define a polygonal area.

You can only have one clipping area per image. If you try to create a second clipping edge, you will be asked if you want to discard the first clipping area. Answering with a No will terminate the command.

Jumping back to the original options in the IMAGECLIP command of:

ON/OFF/Delete/<New boundary>:

ON turns clipping ON and displays the clipped image (using the previously defined clipping frame).

OFF turns clipping OFF and the entire raster image displays. Should you create another clipping boundary, clipping will automatically be turned back ON.

Delete is used to remove a previously defined clipping boundary, the full image again displays.

Bonus!
These are all of the standard IMAGE modification commands, but I would be remiss if I didn't mention the awesome BONUS tool that takes clipping one step further-CLIPIT. Located under the Bonus =>Modify pulldown menu you'll find the Extended Clip option. Hopefully, you've all loaded the incredible BONUS menus (I can't live without mine!).

CLIPIT goes one giant step further than IMAGECLIP by allowing you to clip to a polyline, a circle or an arc. You will draw the clipping frame first with any of the above objects and then execute the CLIPIT command. Let's review the CLIPIT options:

Command: CLIPIT

Pick a POLYLINE, CIRCLE or ARC for clipping edge...

Select objects: Pick the object(s) you want to use for your clipping edge.

Pick an IMAGE, a WIPEOUT or an XREF/BLOCK to clip: Pick object to clip.

Enter max error distance for resolution of arcs <0.0200>:

The last option might confuse you. CLIPIT actually allows you to clip to curved boundaries by creating a series of very short line segments along the arc. You control the precision of these line segments relative to the arc segments within your curve. You specify the maximum distance permitted between the midpoint of any given segment and the corresponding arc. The smaller the value, the tighter the boundary will follow the curve. The end result looks great, you'll never know it's not actually clipping to the physical curve. The CLIPIT help file does an excellent job of explaining the process for traversing arc segments.

CLIPIT doesn't stop at raster images. You'll find that you can also clip your wipeouts, external references and blocks in the same manner. For those of you who are on the VIP subscription plan or have purchased the Express tools, you'll find that CLIPIT has been enhanced to permit clipping to ellipses, text, mtext and attribute definitions (if you can imagine!).

Introducing raster files into a vector environment is an amazing accomplishment. What used to be painful at best is now a simple process. If you've shied away from using raster images in your drawings due to past experiences, hopefully you'll give them another chance. I think you'll find them much easier to use and modify.

Until next month...Happy AutoCADding!

Lynn Allen

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Sours: https://www.cadalyst.com/cad/autocad/editing-those-raster-images-4733
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Raster images consist of a rectangular grid of small squares or dots known as pixels. For example, a photograph of a house is made up of a series of pixels colorized to represent the appearance of a house. A raster image references the pixels in a specific grid.

Raster images, like many other drawing objects, can be copied, moved, or clipped. You can modify an image with grip modes, adjust an image for contrast, clip the image with a rectangle or polygon, or use an image as a cutting edge for a trim.

The image file formats supported by the program include the most common formats used in major technical imaging application areas: computer graphics, document management, engineering, mapping, and geographic information systems (GIS). Images can be bitonal, 8-bit gray, 8-bit color, or 24-bit color. Images with 16-bit color depth are not supported.

Several image file formats support images with transparent pixels. When image transparency is set to on, the program recognizes those transparent pixels and allows graphics in the drawing area to “show through” those pixels. (In bitonal images, background pixels are treated as transparent.) Transparent images can be gray-scale or color.

Supported Raster Image File Formats

Format Extension
Adobe Photoshop Format .psd
Arc/Info ASCII Grid Format .asc, .txt
Arc/Info Binary Grid Format .adf
Autodesk Animator .fli, . flc
CALS Type .cal, .mil, .rst, .cg4, .gp4, .cals
DDS (HDR) Format .dds
Digital Terrain Elevation Data .dt0, .dt1, .dt2
ECW Compressed Image Format .ecw
FAST-L7A .fst
GIS-GeoSPOT .bil, .bip, .bsq
Graphics Interchange Format .gif
HDR Format .hdr, .pic
ILM OpenEXR Format .exr
Image Systems CCITT Group 4 .ig4
JPEG File Interchange Format .jpg, .jpeg
JPEG2000 .jp2, .j2k
Macintosh PICT .pct, .pict
MrSid .sid
Native Format DOQ .doq, .nws, .nes, .ses, .sws
NITF .ntf
Portable Network Graphics File .png
QuickBird Tagged Image File Format .tif, .tiff
RLC .rlc
Tagged Image File Format .tif, .tiff
Truevision Targa .tga
USGS Digital Elevation Model .dem
Windows Bitmap .bmp, .dib, .rle
ZSoft PC Paintbrush .pcx

Note: Although the file name extension is listed in the previous table, the file format is determined from the file contents, not from the file extension.

Sours: https://knowledge.autodesk.com/support/autocad/learn-explore/caas/CloudHelp/cloudhelp/2019/ENU/AutoCAD-Core/files/GUID-E6EDF33B-052A-4A7C-AF7B-870FC6303598-htm.html
How to raster image in autocad

How do you send a raster image back in AutoCAD?

To Change the Draw Order of an Inserted Image

  1. Select the image.
  2. Do one of the following in the Planning And Analysis workspace: Click Home tab Modify panel Bring To Front drop-down Bring To Front. Click Home tab Modify panel Bring To Front drop-down Send To Back.

How do I raster an image in AutoCAD 2018?

Help

  1. Click Insert tab References panel Attach. Find.
  2. In the Select Image File dialog box, select a file name from the list or enter the name of the image file in the File Name box. Click Open.
  3. In the Image dialog box, use one of the following methods to specify insertion point, scale, or rotation: …
  4. Click OK.

Is AutoCAD vector or raster?

In the digital world, there are two main types of graphics files: vector drawings and raster images. AutoCAD is a vector-based program. In other words, when you create an AutoCAD drawing, you are working with specific types of entities: arcs, lines, and text.

What is AutoCAD raster design used for?

AutoCAD Raster Design Toolset

Edit scanned drawings in a familiar AutoCAD environment. Despeckle, bias, mirror, and touch up your images. Use standard AutoCAD commands on raster regions and primitives. Easily erase raster images, lines, arcs, and circles.

How do you move a line to the front or back in AutoCAD?

To rearrange content objects:

  1. To re-order the Hatch object to the background, use HATCHTOBACK (Command).
  2. To bring Text (and MText) object in front of everything else before doing a save or a plot command, use TEXTTOFRONT (Command).

How do you bring a layer to the front in AutoCAD?

There is a quick and easy way to do that in Autocad. use command QSELECT, select the layer, then right click, “draw order” and you can either bring to front/send to back or “bring above objects/send below objects”.

How do I convert an image to DWG?

How to convert JPG files to DWG online?

  1. Upload JPG-file. Click “Choose File” button to select a jpg file on your computer. JPG file size can be up to 50 Mb.
  2. Convert JPG to DWG. Click “Convert” button to start conversion.
  3. Download your DWG. When the conversion process is complete, you can download the DWG file.

How do I convert an image to AutoCAD?

While tedious, this process guarantees accurate and complete conversion.

  1. Open AutoCAD and start a new blank drawing. …
  2. Scan your image and save the file as a BMP, JPG, PNG or TIF file. …
  3. Import the scanned image into AutoCAD. …
  4. Apply a new layer for tracing. …
  5. Trace over your scanned image. …
  6. Establish the scale of your drawing.

Can you trace an image in AutoCAD?

You can trace drawings in the application by importing an image file of your drawing and using the line, arc and spline tools. A spline is a curvilinear line, and it is one of the most useful line tools when tracing an image. … Click your mouse over the image lines to trace them in the AutoCAD drawing.

How do I convert an image to vector?

Here’s how to easily convert a raster image into a vector image using the Image Trace tool in Adobe Illustrator:

  1. With the image open in Adobe Illustrator, select Window > Image Trace. …
  2. With the image selected, check the Preview box. …
  3. Select the Mode drop down menu, and choose the mode that best suits your design.

What is raster vs vector?

The main difference between vector and raster graphics is that raster graphics are composed of pixels, while vector graphics are composed of paths. A raster graphic, such as a gif or jpeg, is an array of pixels of various colors, which together form an image.

Is a PDF vector or raster?

*A PDF is generally a vector file. However, depending how a PDF is originally created, it can be either a vector or a raster file. Whether you opt to flatten the layers of your file or choose to retain each one will determine the image type.

Can raster images be converted to vector?

Answer: A raster graphic, which is made up of a specific number of pixels cannot be translated into a vector graphic, an image made up of paths. … While it is possible to create a vector image (i.e. an EPS file) from a raster graphic (i.e. a JPEG image), an exact conversion is not possible.

What is AutoCAD designer?

AutoCAD Drafters specialize in creating Computer-Aided Design (CAD) models using Autodesk’s AutoCAD software. These highly-trained draftsmen work with architects and engineers to design and create 2D and 3D computer models of buildings and machine parts from blueprints or from scratch.

What is raster image in AutoCAD?

You can attach a reference to a raster image file to a drawing file using a linked image path. … Images can be referenced and placed in drawing files, but like external references (xrefs), they are not actually part of the drawing file. The image is linked to the drawing file through a path name.

Sours: https://birchlerarroyo.com/autocad/how-do-you-rasterize-in-autocad.html

Autocad rastering in

How do I get raster tools in AutoCAD?

Launch AutoCAD. Type OPTIONS on the command line and then click the Files tab. Expand Support File Search Path and add the following paths, choosing the installed Raster Design version number: C:program filesautodeskautocad raster design 20xx.

How do I insert a raster image in AutoCAD?

Binding Image files to a DWG in Autocad

  1. Once image file is open in Paint > on your keyboard ‘Ctrl + A’ together (shortcut to Select All) > then press ‘Ctrl + C'(shortcut for Copy to Clipboard)
  2. Open your Autocad file that image needs to go into.
  3. In command line type PASTESPEC > press ENTER.
  4. A dialog box will pop up > select ‘Paintbrush Picture’ > click OK.

Is Raster Design included in AutoCAD 2020?

Now Included with AutoCAD

The AutoCAD Raster Design toolset adds raster-to-vector tools to help you convert raster images into DWG™ objects. Edit scanned drawings in a familiar AutoCAD environment. Despeckle, bias, mirror, and touch up your images. Use standard AutoCAD commands on raster regions and primitives.

What is AutoCAD designer?

AutoCAD Drafters specialize in creating Computer-Aided Design (CAD) models using Autodesk’s AutoCAD software. These highly-trained draftsmen work with architects and engineers to design and create 2D and 3D computer models of buildings and machine parts from blueprints or from scratch.

What is the definition of raster?

: a scan pattern (as of the electron beam in a cathode-ray tube) in which an area is scanned from side to side in lines from top to bottom also : a pattern of closely spaced rows of dots that form an image (as on the cathode-ray tube of a television or computer display)

How can I convert JPG to DWG?

How to convert JPG files to DWG online?

  1. Upload JPG-file. Click “Choose File” button to select a jpg file on your computer. JPG file size can be up to 50 Mb.
  2. Convert JPG to DWG. Click “Convert” button to start conversion.
  3. Download your DWG. When the conversion process is complete, you can download the DWG file.

Can you import JPEG into AutoCAD?

In the Select Image File dialog box, select a file name from the list or enter the name of the image file in the File Name box. Click Open. … Select Specify On-Screen to use the pointing device to insert the image at the location, scale, or angle you want.

Can you bind images in AutoCAD?

The right way is to attach the image with relative path (or non, if the image is in tge same folder). … The perfect way: Use command etransmit for all external stuff like fonts images other xrefs plotstyletable.. The only way to paste an image as content to dwg is to insert it as embedded OLE object.

Is AutoCAD a vector program?

In the digital world, there are two main types of graphics files: vector drawings and raster images. AutoCAD is a vector-based program. In other words, when you create an AutoCAD drawing, you are working with specific types of entities: arcs, lines, and text.

How do I open a vector file in AutoCAD?

Adobe Illustrator creates vector-based drawings that are saved in Adobe’s [AI] format by default. This format cannot be read in AutoCAD®, but you can export to DWG file format in Adobe Illustrator. The exported file will have the following characteristics: DWG AutoCAD 2000 format.

What is raster bitmap graphics?

Raster graphics, also called bitmap graphics, a type of digital image that uses tiny rectangular pixels, or picture elements, arranged in a grid formation to represent an image.

What is AutoCAD salary?

AutoCAD Drafter: $44,000. AutoCAD Designer: $51,000. AutoCAD Certified Associate: $52,000. AutoCAD Mechanical Designer: $62,000.

Is CAD design a good career?

The job prospects are definitely better for anyone who has proven technical skills and experience with computer aided design systems. This career is likely to be very sensitive to changes within the economy as it is tied to construction and manufacturing.

Is AutoCAD hard to learn?

Learning CAD can be Difficult

Some parametric and 3D CAD applications have fairly steep learning curves. Due to their complexity, the commitment to learn is longer. CAD programs, such as AutoCAD or 3DS Max, can have up to 1500 to 3000 commands within the program.

Sours: https://birchlerarroyo.com/autocad/how-do-i-install-raster-tools-in-autocad.html
Raster Image to DWG - AutoCAD Inserting \u0026 Tracing Images - Convert JPG to DWG

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