Autocad 2013 Highly Compressed 11
Brie Hoffler
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i ve got a .png picture which has a size of 100mb. It has to have a very high resolution so my question is. I need to put this png (top view) to lay under the buidlings in the dwg (i know how to do it) but when i render the top view with very high settings, does it also render the xref in a very high resolution? How high is the quality of xrefs in autocad in general?
It does work as an xref. It shows up in the rendering and shadows fall onplane thats underneath. But i my question is how autocad treats a high resolution picutre cause i dont want autocad to compress it down in any way.
The original image is around 100 MB, but only about half is visible in the viewport, so the PDF should be around 50 MB if there is no compression (only negligible amounts of text and lines besides the image), however if I plot it to a PDF using Adobe PDF, setting the resolution to 300 dpi and medium JPEG compression the resulting file is 150 MB. If I choose 72 dpi and low JPEG compression the file looks very bad and compressed but is still around 40 MB in size. This is far too large considering the amount of compression visible in the image, it looks like a 500 KB file tops.
Do you have access to the original image? If so you should look into editing the image before putting it into your drawing. If you have photoshop try that or any other image editing program. You may be able to decrease the image file size without to big a hit to your resolution. There are some programs that can store a high resolution image in a certain way that reduces the file size but I'm not sure how to get my hands on a program like that or if it can even work with autocad. When it comes to image files the only thing that matters on size is pixel count. The more pixels the higher the resolution.
Aerial imagery is used for a wide range of tasks within the context of AutoCAD Map 3D and AutoCAD Civil 3D. Although some image formats such as Mr. SID provide highly compressed, high-resolution imagery within the context of these products, these images only cover but so much area. This can be especially challenging if your site is on the line of two adjacent municipalities (otherwise known as the extent of such imagery).
Once the download is complete you will find a file in your downloads folder that ends with the extension .sfx.exe. Depending on what software you download will determine how many of these files you receive. These are just highly compressed zip files. Below is an example of my AutoCAD 2018 download. To begin the extraction simply double click the first one and the extraction of all of them will begin.
Design Web Format (DWF) is a secure file format developed by Autodesk for the efficient distribution and communication of rich design data to anyone who needs to view, review, or print design files. Because DWF files are highly compressed, they are smaller and faster to transmit than design files, without the overhead associated with complex CAD drawings (or the management of external links and dependencies). With DWF functionality, publishers of design data can limit the specific design data and plot styles to only what they want recipients to see and can publish multisheet drawing sets from multiple AutoCAD drawings in a single DWF file. They can also publish 3D models from most Autodesk design applications.
Related publishing formats from AutoDesk: Two proprietary formats with limited functionality have been developed by AutoDesk for publishing designs. DWF and DWFx are secure file formats developed to combine and publish rich 2D- and 3D-design data. They are highly compressed file formats suitable for distributing a single drawing or multiple drawings and sheet sets over the Internet for review by people without a CAD application. AutoDesk provides a free application, Autodesk Design Review, for this purpose. DWFx is a relatively new version of the DWF file format, based on Microsoft's XML Paper Specification (XPS). DWFx documents can be viewed and printed with the Microsoft XPS Viewer, distributed as part of the Windows operating system. See About DWF and DWFx Files.
The precursor to AutoCAD was Interact, written by Mike Riddle for early microcomputers, starting in 1977, and released as a product in 1979 for a system based on a Marinchip 9900 CPU, which had hardware multiplication. In 1981, Riddle and the principals of Marinchip Systems, John Walker and Dan Drake, joined about a dozen other people to found AutoDesk and rewrite the software for the IBM PC. See Mike Riddle's Prehistoric AutoCAD; interviews in 2005 with Mike Riddle from the Digibarn Computer Museum; and The Autodesk File: Bits of History, Words of Experience by John Walker. The highly compressed form of the DWG format has its origins in the early days of personal computers.
(2) The file created from AutoCAD on MacOS is entirely color raster imagery at 600dpi using ZIP compression, In contrast, the file created from AutoCAD under Windows uses text and vector where possible with the raster images compressed with lossy JPEG. That explains the dramatic difference in size (and ironi
(2) The file created from AutoCAD on MacOS is entirely color raster imagery at 600dpi using ZIP compression, In contrast, the file created from AutoCAD under Windows uses text and vector where possible with the raster images compressed with lossy JPEG. That explains the dramatic difference in size (and ironically quality - the smaller file is higher quality)!
(3) The pages from -content/uploads/bsk-pdf-manager/6_SM-2703-CERTIFICATION_6.pdf are in fact JPEG2000 compressed images at 150dpi with no text and no vector. Although Adobe's desktop and mobile PDF software has no problems with JPEG2000 raster images, various third party viewers are not so robust. The artifacts that you see via are likely due to a crufty JPEG2000 implementation. High quality JPEG or ZIP (Flate) compression would have eliminated this particular issue!
The .DWG format is a highly compressed file to store hierarchical information of a drawing, including geometry and metadata (e.g. properties, xData, xRecord). Convert to JSON is a tricky request: do you need the geometry or the metadata?
If your applicationcan support them, then TIFF Group IV is the the best format for line drawings. It onlysupports Black and White, but it is highly compressed and large drawings with highresolution are possible while still maintaining small file size.
It is important to understand that when you add a raster image as a background, the file size of the image is not the true indicator of how much memory it takes to load it. The program needs to load it uncompressed, into a contiguous block of memory. So, the resolution of the image is really the true indicator of the memory it takes up.
JPEG images are highly compressed so the uncompressed form can take a very large amount of memory. If many programs had been opened during their windows session, those things may be loaded into random sections of memory, which makes it much more difficult for the program to find a contiguous block of that memory to load the background.
The reason why it sometimes appears that memory is being limited is due to the fact that the uncompressed image must be allocated a contiguous block of memory. So, with 3GB of physical memory total, the application has 2GB to work with. Various parts of the program are allocated segments of memory for:
What's left over and contiguous is what the program can allocate for the uncompressed image, which could potentially be small. To further complicate matters, the memory usage reported by the Windows task manager is not always accurate. See the following article
- *.sid raster files are ultra compressed on disk. Unfortunately, WaterCAD/GEMS needs to uncompress these file to display them. The Mr.SID file may look like it uses only 8 MB of disk space, however, it could be hundreds of MB in memory when uncompressed. Fortunately, *.sid files support the resolution setting in our standalone, so you can choose to load at a lower resolution, which i often good enough and will often avoid running out of memory. When opening the file you should be prompted for the resolution in which the file is to be displayed.
- Other raster file formats such as (*.bmp, *.jpg, etc.) can have similar problems. Some formats are compressed on disk, some are not. Looking at disk size is not always a good indicator of how much memory is require to load and draw it the file in the standalone. If you get an out of memory error with one of these file types, try opening the file in an image editing program (Photoshop, Paint, GiMP, ...) and lower the resolution.
A DWF file is a 2D or 3D drawing saved in the Design Web Format (DWF) developed by Autodesk. It contains design data, which includes graphics and text. DWF files are saved in a Zip-compressed format to reduce their file size.
The Design Web Format was developed as a device-independent and resolution-independent drawing format for distributing designs. It is not intended to replace popular CAD formats, but instead, is used to save designs in a more accessible, open format that can be opened without the need to purchase expensive CAD software. The format is based on the HOOPS Stream (HSF) 2D/3D format but is also Zip-compressed.
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