Leave the frame
24.12.19

The purpose of using images on transparencies is to visualize the message they accompany, thus reinforcing its meaning. The shape of the pictures is a feature that facilitates this.
A picture with a background creates a visual separation from the accompanying message and breaks the consistency of the transparency design. Leave the frame.
An image without a background, outlined, integrates much better into the transparency, showing greater consistency and facilitating the link with the message. Another alternative is to use large pictures that act as a background of the transparency, ensuring the integration between the image and the message.