For PNG image file and PSD file

1. Open your artwork in Adobe Photoshop 

2. Select area you wish by using Selection Tool, Magic wand

3. Choose menu Windows > Channels > press+hold Ctrl (Windows) or Cmd (Mac) then click "Create new channel"

8. Make Spot Channel, Name it "White" and Solidity = 100% then click OK.

9. Save file to PSD

For Ai file

     1.  Create another Layer. Name the Layer "White"

     2. Create Vector for the area that you wish to make spot white or non-hologram spot (for holographic/metalized material). Line it up to your actual artwork

     3. When you have done, save file to Ai and recheck it again that all files and images are embeded and all texts are already created outlines.