Fading Images for Sections Completed on a Main Menu

Is there a way to put a semi-transparent grayed-out rectangle over a colored image in Lectora to make the illusion the image is black and white? I want to use an "illusioned" black and white image in the Main Menu to show that section has been completed without inserting a separate black and white image over the colored image. If anyone would like to share any tips on this, that would be great!!!


Thanks!

Kari

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