Poor thumbnail quality when the bitmap is set via Database.ThumbnailBitmap

[reuter.philipp]

When I set the image with Application.DocumentManager.MdiActiveDocument.Database.ThumbnailBitmap = thumb;, no matter if I load it with bitmap thumb = new Bitmap("C:_size, _size); or with bitmap thumb = _doc.CapturePreviewImage(_size, _size);, the result is always the screenshot:

The .png saved with thumb.Save(imagePath, ImageFormat.Png);:

And the Thumbnail with THUMBSIZE and "_QSAVE" run as command(All 3 have ~1024px as Size):

How to improve the poor thumbnail quality?

Greetings, Philipp

[R.Gerritsen4967]

Maybe you can try to change the THUMBSIZE2D system variable.

Default value is 0, but maybe it helps if you change it to 1.