Hoping someone can explain this…
I regularly photograph books and documents in order to import them into DEVONthink 3 with OCR.
I export the images from Apple Photos in full size, with resolution typically in the region of 3000 x 4000 pixels.
If I use either TIFF or JPEG as the export format, the resulting PDF+text documents (after being imported into DT3 with OCR) appear very small at “actual size” to the extent I have to zoom in quite a bit just to read them — even though the inspector reports them to be around 17 x 23cm in size (which isn’t that far off A4 size in printing terms). Interestingly, zooming in reveals quite a lot of detail.
However, if I export from Apple Photos in PNG format, the resulting PDF+text documents in DT3 appear much much larger at “actual size” — the inspector confirms this as they’re typically 100 x 140 cm! Yet, weirdly they’re about the same 75KB in storage size and when I zoom the text to the same size as the documents originally exported as TIFF or JPEG they look similar in image quality.
I’m very confused about what is happening here and why PNGs are treated so differently by DT3??
I THINK the answer is in someway related to the behaviour I see in Apple’s Preview app where there’s a setting in Preferences where you can “Define 100% scale as” either “1 point equals 1 screen pixel” (which is DT3’s default behaviour with TIFFs and JPEGS converted to OCR’d PDF) or “Size on screen equals size on printout” (which is the size I kinda expect to see and displays as the same size as the PNGs imported into DT3).
My head hurts!