Just to be clear: You are looking for the print of a Copy of a Copy of a Copy to be just as clear as the original?
(DWG to PDF to Screenshot to Paint (PNG) to HP Plotter)
How about the HP Printer?
Possibly any options there for you?
You also said the PDF in question was too big to post. Could you put together a small, in terms of bytes, example file that uses the same steps that are giving you problems? Basically a scaled drawing say.
From there maybe something will pop up for someone here.
Also zipping a file may allow it to be posted here but typically files wih embedded prictures do not zip much smaller that they are unzipped.
Have you asked the question at the HP public forums? Maybe someone there has seen something similar.
Though I hate to say but the once or twice I've tried there the solutions have been limited and/or non-existant.
If you are not getting the satisfaction you need here then pay-per-incident support may be the best option. Spending $200 on the problem that will in the end hopefully return thousands seems a cheep fix to me.
You asked for Autodesk to answer, I gave you the links to get what you seek.
This is peer support: everyone here is like you, an end-user.
Since it's obvious there is no image compression in AutoCAD, and there never has been BTW, I remain perplexed at what you expect to accomplish with repeatedly asking the same question at those of us who do not create the software you use.
To clear up - there is a high quality raster image that is attached to DWG drawing. After the DWG + high quality raster image is printed to PDF file (with "Autodesk DWG to PDF" driver) the raster on outcoming PDF file looks awful.
So the problem is that "Autodesk DWG to PDF" printer has corrupted ("compressed") high quality raster.
Does anyone know how to control compression or quality of printing rasters within "Autodesk DWG to PDF" printer?
Thanks for your answers, I didn't realize there are no Autodesk specialists. To answer Charles, I would like to say, that it doesn't matter how many copies I have made, because it is computer copy and if I write, there is no loss of information, there is no loss of information - and files really looks the same even if I made print screen with 72dpi - it is not the issue - I'm affraid you don't get the point, what I'm writing about.
I didn't try to print it with hp printer, because I want to print it wiht Autodesk DWG to PDF printer.
After you asked to attach pdf file, I'm attaching it now, if you really want it (unless I think it is unnessesary).
So what I attach now are two files - the first one is print screen made while I generated print preview using DWG to PDF printer (before ploting it to pdf) and the second file is plotted pdf. If you could look at the first one and the second you will see, that the raster map in print preview is perfectly clear and after ploting it is very bad quality (it looks like jpeg compression). The raster image resolution setting is set to 1200 dpi but it doesn't help at all. When I used external Adobe Acrobat printer, there is a setting that allows to set raster image compression, but there is no such setting in DWG to PDF printer.
The only controls for that PC3 file is found throuogh Plottermanager command on the Custom Properties pop-up, see screenshot.
If you need more control you'll probably need to seek a 3rd party PDF driver with those features added.
Thx for your answers. I regret, that there are no settings that allow to set pdf resolution. I home it will be added in some future release instead of meny unnesessary, but very visualy impressive improvements (e.g. new command line in 2013 release).
I know this reply is quite late, but maybe it will help you, or even someone else with the same problem.
I recently had a similar problem when trying to output a 3D drawing of a building to PDF. In AutoCAD 2013, I have a viewport set to Realistic visual style, with textures applied to every surface. When I printed using DWG To PDF, the output was always low quality, even with a high DPI selected. When zooming in, it was obvious that a JPEG compression was being applied to the image output.
I also have Adobe Acrobat 9 Professional, so I tried to plot to PDF using that driver. The output still showed an unacceptable level of JPEG compression for what I was trying to do.
I dug deep into the settings for the Adobe print driver and found that it allows you set the compression method. For color images, you can select from "Off", "ZIP", "JPEG", and "JPEG2000". It also lets you control the image downsampling DPI and method. In my case, I was able to make a great looking PDF by turning compression off entirely. However, the Arch D size PDF came out to 734 MB file size. Obviously, that's excessive. I tried again with ZIP compression, and it was a good bit smaller at 199 MB, but still too large. I found that I could open either file in Adobe, "Reduce File Size", and get a PDF that looks pretty good with a file size of only 9 MB. I still wanted to try the other options, so I used JPEG2000 compression, with quality level set to "Lossless", and no downsampling. That came out looking just as good as any, with a size of 90 MB. Then I tried one more run, with JPEG2000 and quality level set to "Maximum", and it came out looking very good with a file size of 17 MB.
So, to summarize, I got the best results by using Acrobat 9 Professional, with image compression method set to JPEG2000, and quality set to Maximum.
I know you are probably not enthused at the idea of spending $400+ to get Adobe Acrobat and open up these options, but the program is a good value for me in my business. I use it constantly to convert PDFs to image files. I also use it for page rotation, combining pages, extracting pages, measuring objects in the PDF, adding custom stamps to documents, and so on. I also like having multiple PDF drivers for odd situations when a particular DWG just won't plot well. If Adobe doesn't work, I try DWG To PDF. If that doesn't work, I try CutePDF. If that doesn't work, I use PDF995! Usually, one of them will get it right.
Hope this is of some use.
I have the same problem here with the internal "dwg to PDF"-converter.
The bitmap quality is awful.
I also don't agree with pendean in post 16 that the 2 attached pdf look good. There are artefacts which didn't appear in the original png.
The way to use an external pdf printer like the Adobe PDF printer or even FreePDF does not really work for me.
The quality is nice but I get a pdf which is not searchable anymore.
At the moment I have only 2 options
a) searchable PDF - but awful raster graphics
b) acceptable graphices but not searchable PDF (and OCR is not a solution)
So the whole thing is pretty disappointing.
I have to revise my opinion.
After changing the Adobe PDF printer options
1) TTF as graphics to TTF as text
2) defining my own high-quality profile which won't touch grey-scale and colour images.
I get perfect quality plus a searchable PDF
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