SBIX Image Scaling

I’m trying to understnd how to make an SBIX font, I’m reading this:

Technically, that number is the number of image pixels which correspond to the em, or in other words, to the font size.

I’m confused about how to correctly set the iColor resolution? What is the relationship between that number and the pixel height/width of the image and the UPM. I just keep changing the iColor number until I get the size that makes sense with the image… I have different sized images by the way for each glyph.

I have an image that is 2250 x 2911px (w x h), and if I’m working at 1000 UPM, how do I set the resolution so that the image is 100%?

I set the iColor resolution to 2911, and I get a scale of 143.14%, it’s only if I set ithe iColor layer to 4166 does it become 100.02%.

Why can’t I just place and scale the image?

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Can you check the DPI setting of you image file?

300dpi ahhh hence the 4166 (300/72dpi)