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In ACR when you go to the image size drop down, the options with a "+"
enlarge the image (like doing Photoshops image resize), the "-" reduce the
image size. What you want is the option that doesn't have a + or - by it
that is the real actual image size done by the camera with no software
As for the size from others it is hard telling without them telling you what
they did. A compressed 20MB file loaded in to Photoshop could be 50MB in
memory. This would indicate that the file is getting about a 50% compression
reduction. In the end it is really all meaningless. You want the native file
dimensions without software enlargement or reduction.
Robert thanks, I spent a long time trying to figure that out.
I am sure to the programmers at Adobe that the + and - signs made perfect
obvious sense. But for some reason it didn't click with me either. If I
hadn't read a post on the forums a year or so ago I doubt I would have ever
got it myself.
You can see digital files in the size of many hundred megapixels or even in the gigapixel range. Are you sure it was a single shot what you saw?
Increasing the image size via upresing is the cheapest solution with corresponding cheap quality. The price to pay for really large images is work, work, work; this means adjusting, stitching, adjusting, blending, adjusting...