Probably you have already generated a PNG image for your model, but did you know that the image may be generated for chosen elements only?
Open your database model in Vertabelo:
Select the desired objects with Ctrl + Click or using Select area from the toolbox:
Click Export model as PNG image in the top toolbar:
And this is your PNG image:
What’s more, if you select a subject area, everything inside it will be included in the image. Open a model containing a subject area:
Select the subject area you want to export to an image file (just click the subject area’s border):
Click the PNG icon in the top toolbar: