Dip to Color transition with graphic

I'm using a Dip to Color Dissolve transition between a black screen and a graphic that has colored text with a black background. When using the transition, I get the flash of white color, as intended, but the outline of the graphic is visibile. Dragging along the timeline, I found that this was because the graphic, centered in the screen, changes color more slowly than the rest of the empty space around, making it so that you can see the square outline of the image during the transition.

Is there a way to fix it so that the graphic and the background change color throughout the transition at the same time, making it clean and unable to see the outline of the graphic?

My apologies if the explanation is somewhat confusing, I'd be happy to clarify if necessary! Thanks!