oliver_fuchs Posted May 11, 2023 Posted May 11, 2023 Hi, I have a more philosophical or general question on the subject "rectengular to polar": I think I understand what it does or what it can do ... but I don't understand why this distortion is so important that it forms an own distortion filter in Affinity - where does the need for such a filter/distortion come from? What practical necessity in photography actually gave rise to this filter - i.e. the practical application? I mean Displace, Equations, Liquify, Pixelate and so on - I know the use of them and what they are for - but Rectengular to polar (or vice versa) - still a mystery to me! P.S. And I still do not understand why this distortion works so well with a mirror distortion before the rec-to-po! Oliver Quote
v_kyr Posted May 11, 2023 Posted May 11, 2023 See for example some descriptions of it's overall usage... Rectangular to polar How Amr Elshamy created "Round Things" ... usages of rectangular to polar filter ... Quote ☛ Affinity Designer 1.10.8 ◆ Affinity Photo 1.10.8 ◆ Affinity Publisher 1.10.8 ◆ OSX El Capitan ☛ Affinity V2.3 apps ◆ MacOS Sonoma 14.2 ◆ iPad OS 17.2
oliver_fuchs Posted May 11, 2023 Author Posted May 11, 2023 HI, thanx for the fast answer ... I saw/read the first and the third one already ... but the second one is great/new. So ... I understand the distortion - but I always wondered what was the need/the main idea behind the "handy effect if you want to create a circular frame from a rectangular border"? Just wondering! I have seen this filter in my video editor too (there it is called "coordinate space") - strange distortion - just wanted to know the history behind it! But thanx for replying Oliver Quote
v_kyr Posted May 11, 2023 Posted May 11, 2023 1 hour ago, oliver_fuchs said: but I always wondered what was the need/the main idea behind the "handy effect if you want to create a circular frame from a rectangular border"? You can simulate sort of an fisheye effect, convert rectangular images into polar ones (for example there are many usages in Astrophotography) and generally make rectangular things in images rounded, create time tunnel effects, ... etc. Create a Fisheye Effect in Astrophotography in 3 Steps Several projection samples by Paul Burke Polar filter in Motion (Apple Final Cut Pro) Quote ☛ Affinity Designer 1.10.8 ◆ Affinity Photo 1.10.8 ◆ Affinity Publisher 1.10.8 ◆ OSX El Capitan ☛ Affinity V2.3 apps ◆ MacOS Sonoma 14.2 ◆ iPad OS 17.2
oliver_fuchs Posted May 11, 2023 Author Posted May 11, 2023 Ah - the fisheye (remove it with polar to rectengular) - ok - that makes sense ... Quote
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