You are describing what is called illuminated text. See the link below for some history and examples of this art form.
text would be a link if a picture it is called an image source object /ISO
A diagram is a picture that goes with text and usually gives an example of what is in the text in picture form.
Colophon
The term is self describing; it is a feature that formats text.
To enhance the visibility of text on a picture, you can try increasing the contrast between the text and the background, using a bold or larger font size, adding a drop shadow or outline to the text, and ensuring that the text is placed in a clear and uncluttered area of the picture.
The antonym for "text" is "image" or "picture."
you can only get a text slideshow if it is a picture message
Picture/phototitle
It's called a concrete or visual poem. Picture Poem see Bedford Introduction to Literature 8th edition
A picture that helps tell a story or explain an idea is called an illustration. Illustrations are visual representations that accompany text to provide clarity or enhance understanding.
To move a picture freely around a document in programs like Microsoft Word, you would need to change the text wrapping or layout setting of the picture from "In Line with Text" to "Behind Text" or "In Front of Text". This allows the picture to be placed anywhere on the page and not constrained by the text.