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So im looking to export an image that is a triangle...easy enough to do with a transparent background and it looks like you have a triangle...but im my case I need the dimensions of the picture to fit the triangle perfectly not be a triangle within a square or rectangular transparent dimension...it's kind of like I'm looking for an option of setting the image to be width, height, and diagonal or something like that. Thanks!

All bitmap images are rectangular/square. So you need the triangle with the transparent bits.

What are you trying to achieve? Maybe someone can help if we know that.