I am using AutoCAD Map 3D 2008. I have downloaded .tiff aerials from an online state source (michigan deq). I am inserting them into the dwg via insert>raster image reference. I overlay all my site information.
When I zoom into the area that I want to print, the printed image is always blurry. The zoomed in area is usually a single project site, average small commerical site. My current client wants me to plot onto 24"x36" paper .. and the result is really blurry. The local print shop is wanting me to plot to a pdf, and I have selected 'maximum' for the quality output.
Please help .. I really don't know what to do to make my images crisp. Is there anything I can do?
what resolution do your images have and how many images fit within 24"/within 36" ?
- alfred -
>> not sure how to answer your question given that
Download and start IrfanView, there you can open nearly all image-files and get the info of the images what resolution each image has, with other words: how many pixel in X and how many pixel in Y-direction.
Then open the drawing and select the images, how many images do you have in X- and how many in Y-direction.
Why do I as that question ... and to answer this part of your question:
>> could that be my problem?
To get a great output for 24", lets say with 600dpi you need 24x600=14400 pixel, so either you have one image with 14000pixel height to fill a print area with 24" high, or you have two images, each having about 7000pixel, or ...
The more pixel you have (and the better your plotter is) the better is the quality. The less pixel you have the worse the result.
And that is, what I want to have checked before we go into AutoCAD or plotter-driver-details.
- alfred -
First, thanks for your help!
Okay .. the file I am working with is 5270x7008 pixels. based on what you said, probably part of the problem. The photo that I have is of a USGS quadrant, so the actual part of the photo that I am using is a small portion of the photo. So, if I understand pixels correctly, the pixel count for the actual photo I'm wanting to print is much, much smaller than 5270x7008.
I have purchased county wide aerial maps before - that are .sid files and have approximately 46,000x42,500 pixels (based on other maps like this that I have downloaded). Again, this size would be of the whole county - and my site is only an average sized city property. Would this type of file be a better starting point?
Also, I have been purchasing my aerials from geocomm.com (GIS Data Depot) .. is there a better place to get photos from, that might have better resolution?
>> Again, this size would be of the whole county - and my site is only an average sized city property
So can you estimate how much % of the whole state-image (the one with 46000x42500) you are seeing (and so plotting)?
If I now guess e.g. your city then uses 500x500 pixel and you try to plot that window to 24"x36" you plot with 20dpi (20pixel for one inch) and that is really not enough the get a quality output.
>> is there a better place to get photos from
Sorry, I'm living in Europe. So I don't have any experience with your organisations and available datasources.
That may be answered by other community-members.
- alfred -
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