# Generating Transparent PNG¶

## Problem¶

You want to depict your molecule in a png image with transparent background for your presentation.

## Ingredients¶

 OEChem TK - cheminformatics toolkit OEDepict TK - molecule depiction toolkit

## Solution¶

If you are rendering a molecule directly into an image file, all you have to do is to call the OERenderMolecule function with the clearbackground = False parameter. If this parameter is True (by default) then the OEWhite color is used to clear the image before rendering the molecule.

 1 2 3 4 5 def RenderMolecule(mol, opts, filename): disp = oedepict.OE2DMolDisplay(mol, opts) clearbackground = False oedepict.OERenderMolecule(filename, disp, clearbackground) 

## Discussion¶

In the case where you are rendering a molecule into an OEImage object, this object has to be constructed with the OETransparentColor color.

 1 2 3 4 5 6 7 8 9 def RenderMoleculeToImage(mol, opts, filename): image = oedepict.OEImage(opts.GetWidth(), opts.GetHeight(), oechem.OETransparentColor) disp = oedepict.OE2DMolDisplay(mol, opts) clearbackground = False oedepict.OERenderMolecule(image, disp, clearbackground) oedepict.OEWriteImage(filename, image) 

Note

The OEDepict TK supports transparent background for png, svg and pdf image files.