I have a bunch of scanned .tif files. If I open them in Photoshop (cs5) then resave them the file size stays the same. If I open them in Camera Raw then "Open Image" to enter Photoshop, the file size doubles (both the size reported by Photoshop and the file size if I "save as").
Any idea why this happens?
The .tif files are not compressed. The same thing happens if I go through Lightroom.
It's likely you have ACR/LR set to open images as 16 bit rather than 8 bit...
That was it. Thank you.