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With MacOS Catalina around the corner, I’m preparing to move from Photoshop CS5 to Affinity Photo, for which I bought a license some time ago.

When I prepare a .png for my website, I’m finding that .pngs exported from AP are bigger than their equivalents from Photoshop (eg 366 KB vs 330 KB). Most of my work is in greyscale and I’ve configured AP’s png export options like this:
 
  • Pixel format: Grayscale 8-bit
  • Resampler: Bilinear
  • Matte: None
  • ICC profile: Generic Gray Profile
  • Embed ICC Profile: unticked
  • Palettised: unticked
  • Embed metadata: unticked
 
Why are AP’s file sizes larger than Photoshop’s, and is there a way of configuring AP to export smaller .pngs?
 
I'd really appreciate some help with this. Thanks in advance.
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Hi tatami :)

I believe this is due to the compression that PS applies to PNG export, unfortunately we don't yet have comparable export settings so you may find your PNGs are slightly smaller from PS. Your export settings in AP have been set to produce the smallest file possible, we hope to implement compression options at export in a future version but have no ETA for this feature currently, my apologies.

Please Note: I am now out of the office until Tuesday 2nd April on annual leave.

If you require urgent assistance, please create a new thread and a member of our team will be sure to assist asap.

Many thanks :)

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@tatami, since you use a Mac you might want to consider ImageOptim, a free app for compressing JPG, PNG, & GIF files. It is very easy to use, supports drag & drop (including onto its Dock icon), & can be added as a service, meaning you can right-click on a file & access it from the Services submenu.

I use it for almost every JPG & PNG file I attach to posts here.

All 3 1.10.8, & all 3 V2.4.1 Mac apps; 2020 iMac 27"; 3.8GHz i7, Radeon Pro 5700, 32GB RAM; macOS 10.15.7
Affinity Photo 
1.10.8; Affinity Designer 1.108; & all 3 V2 apps for iPad; 6th Generation iPad 32 GB; Apple Pencil; iPadOS 15.7

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