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


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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?

Affinity Photo 1.9.0.932 for Windows  OS: Windows 10 x64 2004  CPU: AMD Threadripper 3970x  RAM: 64 GB 3800 Mhz  GPU: MSI GeForce RTX 3090 Suprim X 24GB + studio driver 460.89  NVMe SSD Samsung 960 Pro 512 GB  Monitor: Eizo ColorEdge CS2420 24"

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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

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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?

Affinity Photo 1.9.0.932 for Windows  OS: Windows 10 x64 2004  CPU: AMD Threadripper 3970x  RAM: 64 GB 3800 Mhz  GPU: MSI GeForce RTX 3090 Suprim X 24GB + studio driver 460.89  NVMe SSD Samsung 960 Pro 512 GB  Monitor: Eizo ColorEdge CS2420 24"

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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.

 

Affinity Store: Affinity Suite (ADe, APh, APu) 1.8.5.703.
Windows 10 Pro, Version 20H2, Build 19042.610.
Dell Latitude E5570, i5-6440HQ 2.60 GHz, 8 GB, Intel HD Graphics 530, 1920 x 1080.
Dell OptiPlex 7060, i5-8500 3.00 GHz, 16 GB, Intel UHD Graphics 630, Dell P2417H 1920 x 1080.
Intel NUC5PGYH, Pentium N3700 2.40 GHz, 8 GB, Intel HD Graphics, EIZO EV2456 1920 x 1200.

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