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TIF bloating when editing

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I edit engineering tif files. I cannot switch to another format due to company standards.


TIF files are growing from 519 KB to over 7MB when doing some simple edits: covering existing items with white (whiting out), adding text, and adding other images (disclaimers, etc). The images I'm adding are all under 577 KB.


What would be the cause for this? When we are viewing these images in our viewing software (within our PDM program), the images are loading very slow because they are so big size-wise. These are technical drawings, some as big a 44" x 34", and I cannot change the image dimensions. If I change DPI, the image clarity is compromised.


I can see file size growing somewhat, but not this much. Any help would be greatly appreciated.

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The original TIF you're opening is probably a 1 bit-per-pixel (black & white) TIF. 


Paint.NET only saves 32-bit TIF files. That'll be the source of the "bloat."

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