What is the nature of your object? Do you need the symbol to reflect changes you make to the object via edition of its parametres? Or is the relatively simple case of needing to cleanup the symblo so it looks nicer?
If its the latter, then you can achieve your result easily without any GDL coding, but if the opposite is true, you won't achieve your result without coding (provided that you aren't happy with the output paramo generated automatically)
From Archicad 8.5 all the way to the present. Passionate Autocad hater as well. Wish to save palets and menus individualy in work enviroments: https://bit.ly/3pg3Bx7
You can paste a 535x535 pixel png image (I use screenshots) here and that sets the preview picture in the object browser.
Can you tell me where this 535x535 figure comes from? It is such an odd number. I did not find any info about it in the Help files or the GDL Reference Manual. However, I tried it and I could paste a 750x750 image to be the Preview Picture of a Library part without any problem.
The Project itself also has a Preview Picture and the Help files say about it that there is no restriction on the image size to be pasted.
After I created the Library Part, I placed it, then opened it again for editing, activated the Preview Picture Windows and my 750x750 image was still there in its original size.
Of course, there is the consideration of how large these preview images should be. In default Archicad Library Parts, the Preview Picture is 256x256 pixels. This is probably a good enough size since you will not see it any larger in Settings Dialog, and the image will not increase the file size of the Library Part significantly either.
Why 256x256 pixels? One reason may be that this is the size of preview images on Windows, if you view your files in the Windows Explorer with the "Extra Large Icons" option. The Preview window in settings dialogs and the Library Part Editor are even smaller than that.
So, the fact that you can use any image size does not means you should because they can increase the size of the Library Part if one uses 1000x1000 pixel or even larger images.
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I don't know where I got the 535 resolution from. I work on an iMac Pro, and I tried 256x256 and that didn't look good. I tried different resolutions and 535x535 seemed to be the smallest one that worked nicely.
I must have tried 512x512 (which is logical because it, like 256 is a standard icon size) and found a problem with it.
I did some research and didn't want to go to the next typical icon size, which is 1024x1024.
I suspect it might have been something to do with my scaled 5K display settings.