Request: expose DPI to image scale constant of `72`

[jamesbraza]

Requested feature

It seems sprinkled across the Docling codebase is a magic number 72. For example, https://github.com/docling-project/docling/blob/v2.55.1/docling/pipeline/standard_pdf_pipeline.py#L200-L202.

https://docling-project.github.io/docling/examples/export_multimodal/ mentions:

IMAGE_RESOLUTION_SCALE: page rendering scale (1 ~ 72 DPI).

In my own code, I work with DPI. So I need to convert DPI to image_scale for PdfPipelineOptions. Can Docling expose this as an importable constant?

IMAGES_SCALE_PER_DPI: int = 72

dpi = 144
print(dpi / IMAGES_SCALE_PER_DPI)  # 2

Alternatives

Redefining the conversion constant 72 in my own code, which is the workaround.

[MannXo]

I can work on this if no one minds.