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CR2 RAW files are highly compressed (non-lossy), whereas DSS saves TIFFs as uncompressed 32-bit images... there's a huge difference between the two.
4752 x 3163 x 4 = 60 MB raw binary data, plus other overheads gets you to 90 MB.
Most people will process their images (stretching, curves, sharpening, etc) first and then save a small JPEG image (eg 1200x800) for uploading here. Possibly link to a larger version on an external website.
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