Amazon Nova Canvas Billing

Based on the available information, I don't have specific pricing details for Amazon Nova Canvas that would answer your questions about whether charges are based on prompt text length or only on the number of images generated.

Regarding image resolution pricing, while I can see that Amazon Nova Canvas supports image generation with a maximum output resolution of up to 4.19 million pixels (such as 2048x2048 or 2816x1536), the documentation provided doesn't specify how pricing scales with different resolutions or whether exceeding 1024 pixels in one dimension affects the price.

The documentation mentions that Amazon Nova Canvas is a text-to-image and image editing model that supports various features including text-to-image generation and has specific resolution constraints, but the specific pricing structure based on resolution or prompt length is not detailed in the sources available.

For accurate pricing information for Amazon Nova Canvas, I would recommend checking the official AWS pricing page for this service or contacting AWS support directly.
Sources
Generating images with Amazon Nova Canvas - Amazon Nova