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working on iMac late 2009 with SSD (500GB) and 16 RAM on the latest version of OS el Capitan (see screen shot for more details). AP 1.7.3 installed on SSD which is bootable disc. My workflow is to import NEF files (nikon d810) to Lightroom 6.14 (standalone version, hence the el Capitan as OS installed and used on my iMac). After some basic adjustments files are either exported as TIFFs to a temporary folder on SSD that I created for files I need to work with AP, or from Lr with Edit in... to Affinity 1.7. When editing in AP (Photo persona) I have observed that that some filters do not work or changes are not visible even with the extreme setting applied. There is no rule... however I would say that in 90% of cases filters do not work. So far I observed this behaviour for: Frequency Separation, Unsharp mask, Clarity, Shadows/Highlights, Highpass, Apply Image (for the greyscale mask)... very disappointing... I don't think it is related with the tech specific action of my iMac as there is this 10% of files that can be edited with these filters with no problems and I am able to observe edits taking place in real-time on my screen.

How do you do frequency separation in Affinity Photo?