Document size - 700mb. Transfered all contents in a new document - 100mb.

[Alex_M]

I've got not that big of a file (16 megapixels, 8-bit and a couple of raster layers) that after saving shockingly took 700 mb of my disk space. I copied all of it's contents in a fresh document with the same dimensions, saved it again and BAM! - 100mb. What causes this colossal difference in file size when the content is 100% the same? I've noticed this is a persistent problem with Affinity Photo. When I finish with a project, I always have to transfer all the contents in a new document before saving otherwise I'd have clogged up my disk by now. Any way to avoid this or is this a bug?

[Jim Monson]

I have found that if I Save As to a new name, the size of the file drops significantly, perhaps due to the fact that Affinity as a feature that preserves what you have done in the background in case of a crash or loss of electricity. There is also the matter of saving ones history with the document (under FILE) if it is on. I have found that this adds up and uses up RAM after a lot of work on a document. Pasting your work into a new document would bring these background features down to zero.

During a day's work I often Save As my work by simply adding a letter to the date suffix I have in my document name (xxx_200411a to xxx_200411b, etc.). This seems to keep my file size down and also gives me a backup until I clean out these files, being sure that my current document is 100% okay

[Alex_M]

Thanks for the help. You are right, when I save a new file, the filesize goes down considerably to the same amount - 100mb. Maybe it would be helpful if there was some kind of a "purge" option that flushes the unnecessary stuff when one is with a project?

[Pšenda]

2 hours ago, Alex_M said:

Maybe it would be helpful if there was some kind of a "purge" option that flushes the unnecessary stuff when one is with a project?

So far, the only option is SaveAs.