(I use this feature every day, multiple times a day, to export vector line art to PDF files - and have NEVER had this issue until now).
All vector lines are being transformed into bitmap rendered line segments (they are several pixels wide and have gradations in shading within the width and length of the lines). No options available under 'Publish to PDF/Settings' dialog box to remedy this issue. Tried every option under the 'PDF Preset' dropdown (Archiving, prepress, document distribution, etc), but that did not fix the issue. The dialog box also shows "1 Issue detected in document', this issue is 'there are fonts below 18pt in your document'. I don't know why that would affect the vector lines, but it's worth noting as I did not have this issue before the update.
Work-around: The only work-around I have found is to use the 'Print' command, then change printer to 'Adobe PDF'. This results in vector lines remaining in the final pdf, not being converted into bitmap. This is, however, not the same as Publish to PDF, and takes significantly longer to 'Print' the file (ie, it's not an ideal workaround).
CorelDRAW has limitations with exporting artwork where objects have transparent fills applied. If the transparent fills are flat it will be hit or miss on whether the objects get rasterized or not when publishing to PDF. When exporting in Adobe Illustrator format the vector objects with transparent fills are usually preserved when the AI file is opened in Illustrator. If the CorelDRAW document has objects with gradient fills and those gradient fills have varying levels of transparency those objects will be rasterized when published to PDF or exported in Adobe Illustrator format.
unfortunately, exporting as an eps file reduces our 3d models to wireframe (with no options or settings for the EPS output that we can find). We need/use the 'hidden' output where only the outlines are illustrated as vector lines, and the model/drawing looks solid. if there is another way to create an eps file (with more control over the settings) with Autocad please do let me know.Thank you for your suggestion.
Ronny, Thank you again for helping so much. We're able to get back to our workflow.Please consider for your curiosity:I've just uploaded another file to that dropbox folder - titled 'TP1734_KR16815-Front3.pdf'It was output from Autocad 8/31/24It does not need to have anything done to it in order to enable 'publish to pdf' to work correctly, resulting in a small file containing vector lines (not the lenses)Is there a noticeable specific difference between this and the other Autocad output .pdf you inspected? Beyond what i've written above, we've entered into Autocad support territory, so: Thank you, Ronny, and everyone else here who chipped in to help answer this technical issue.
On that new PDF download you're getting line weight errors.
Firstly, Thanks to Ronny Axelsson for identifying that the pdf files imported from autocad had transparencies integrated into them (though they weren't really visible until you publish), and once disabled the vector lines would publish correctly. The second part to this issue was why the Autocad output pdf files (as of 9/9/24) were adding transparencies (when 'plot transparency' was toggled off in the plot dialog box). The solution (found in a 2018 post on Autocad forum) is as follows:
In the Plot dialog box:- Properties(next to plotter name)- Device and Document Settings- Graphics- Merge Control <Lines Overwrite>
Set to "Lines Overwrite".
Ours was set "Lines Merge" which caused this problem. We don't know how or why this setting changed. Most likely a user here changed it without realizing their error. If changes are made in the 'PDF Options' dialog box, it prompts you to save over the master file for that print option. Once changed to "Lines Overwrite", the imported pdf files will publish from Corel as vector.