Hunternif Posted January 26 Posted January 26 I use Paint Brush in Affinity Photo to do line drawing. On a high resolution canvas (e.g. 9600px by 5400px) I consistently observe this issue: the beginning of every brush stroke is a straight line. Even as I move my hand in circles to draw a circle, as I press the Apple Pencil down on the screen the beginning of my stroke becomes a straight line. This is less noticeable on a smaller canvas (e.g. 1920px by 1080px), and more noticeable on larger canvas (e.g. 9600px by 5400px). The issue also goes away if I move my hand very slowly, or if I place the pencil down first before starting to move my hand (but as an artist, this is unnatural.) Please see my screen recording, made on 9600px by 5400px: Recently I've been doing a lot of drawing on the same device on the same version of Affinity Photo and I only noticed this today, so this issue could have started occurring recently. This does not happen in other drawing apps, e.g. Procreate. Restarting my iPad does not help. My specs: Affinity Photo v2.5.7 iPad Pro 12.9" 2020 Quote
NotMyFault Posted January 26 Posted January 26 Try to deactivate „wet edges“. Quote Mac mini M1 A2348 | MBP M3 Windows 11 - AMD Ryzen 9 5900x - 32 GB RAM - Nvidia GTX 1080 LG34WK950U-W, calibrated to DCI-P3 with LG Calibration Studio / Spider 5 | Dell 27“ 4K iPad Air Gen 5 (2022) A2589 Special interest into procedural texture filter, edit alpha channel, RGB/16 and RGB/32 color formats, stacking, finding root causes for misbehaving files, finding creative solutions for unsolvable tasks, finding bugs in Apps. I use iPad screenshots and videos even in the Desktop section of the forum when I expect no relevant difference.
Hunternif Posted January 26 Author Posted January 26 31 minutes ago, NotMyFault said: Try to deactivate „wet edges“. Tried it, does not help with the straight line issue. Quote
NotMyFault Posted January 26 Posted January 26 Can you share all brush settings as screenshots? Settings of Photo use a fresh basic round brush settings in “more“ / clicking the brush symbol in top of window Brush panel any accessibility options in IPad activated? which pen model exactly? same when you use touch? Quote Mac mini M1 A2348 | MBP M3 Windows 11 - AMD Ryzen 9 5900x - 32 GB RAM - Nvidia GTX 1080 LG34WK950U-W, calibrated to DCI-P3 with LG Calibration Studio / Spider 5 | Dell 27“ 4K iPad Air Gen 5 (2022) A2589 Special interest into procedural texture filter, edit alpha channel, RGB/16 and RGB/32 color formats, stacking, finding root causes for misbehaving files, finding creative solutions for unsolvable tasks, finding bugs in Apps. I use iPad screenshots and videos even in the Desktop section of the forum when I expect no relevant difference.
Hunternif Posted February 1 Author Posted February 1 Hi @NotMyFault, The issue applies to all brushes. I just recorded it with the Basic Round brush, using my finger instead of the Apple Pencil. Please see the video and screenshots below. More notes: Normally I use Apple Pencil 2nd gen. Same issue when using touch. No accessibility options are enabled. (Just noticed that on the video I have "wet edges" enabled, but disabling them gives the same result.) Settings for the Basic Round brush: Quote
NotMyFault Posted February 1 Posted February 1 When I playback with 1/4 speed, I see that the touch jumps from starting position before if follows a more harmonic circular path. your gestures are actually faster than I have seen anywhere else (e.g. the Affinity creative session videos) Can you try in any other app, e.g. Apple notes app, if it behaves the same? currently I’m skeptic that the issue is specific to Affinity apps. I use a similar setup and don’t get this behavior - but my gestures are much slower. maybe you pen/touch gestures are faster than Apple HW is able to track. Quote Mac mini M1 A2348 | MBP M3 Windows 11 - AMD Ryzen 9 5900x - 32 GB RAM - Nvidia GTX 1080 LG34WK950U-W, calibrated to DCI-P3 with LG Calibration Studio / Spider 5 | Dell 27“ 4K iPad Air Gen 5 (2022) A2589 Special interest into procedural texture filter, edit alpha channel, RGB/16 and RGB/32 color formats, stacking, finding root causes for misbehaving files, finding creative solutions for unsolvable tasks, finding bugs in Apps. I use iPad screenshots and videos even in the Desktop section of the forum when I expect no relevant difference.
Hunternif Posted February 1 Author Posted February 1 I suppose that's a healthy scepticism. Please see below some examples I recorded in Apple Notes, Procreate and Affinity Photo. Apple Notes: Procreate (canvas size 6000px by 4000px): Affinity Photo again (canvas size 6000px by 4000px, so the issue is slightly less apparent): It's interesting that on the first circle there was another hickup along the way that straightened another segment of my circe. This doesn't usually happen, but it's also an issue. If this was a production drawing, I would need to redraw this line. My iPad's screen capture records at 30 fps, while the screen's actual refresh rate is a much smoother 120 Hz. So these videos are not the most accurate capture of reality. But the Apple Pencil's polling frequency is even higher at 240 Hz (according to this documentation). I can't possibly move my hand so fast as for the hardware to not capture it, and the recordings above from other apps confirm this. Ok to be fair, it's probably possible that my hand moves 240cm per second, but the other apps seem to handle it just fine. Also I make this motion at a pretty consistent speed, so you should expect to see straight segments all along the arc, not just the beginning. You're right to notice that the blue dot appears to quickly jump over the straight line segments. The blue dot itself comes from Affinity Photo "Show Touches" feature. This jump suggests that the app freezes for a split-second there, and doesn't capture any of my input while that happens. As for my gesture speed, it's a preference. When drawing circles or large round arcs, they come out smoother when you move fast. Or certain styles of line drawing require hundreds of little strokes (e.g. hatching), and drawing each stroke slowly is just... slow. On my last video captured in Affinity Photo, in the bottom left example, I put the pen down first and wait for the app to catch up with me, and then continue my drawing. But that is a very unnatural movement, and it gives me a wobbly line. I understand that my canvas size is pretty high at 6000px by 4000px. Lowering it is a tradeoff, giving me better performance at the cost of lower resolution. I really hope this issue can be fixed so I don't have to downgrade my canvas. I could also turn on stabilization, which also removes this particular issue, but it makes quick sketchy lines impossible to draw. NotMyFault 1 Quote
NotMyFault Posted February 2 Posted February 2 Thank you for the extensive testing and excellent documentation and analyses. Hope that Affinity staff steps in to acknowledge either a bug or a „by design“ limitation of the app. Quote Mac mini M1 A2348 | MBP M3 Windows 11 - AMD Ryzen 9 5900x - 32 GB RAM - Nvidia GTX 1080 LG34WK950U-W, calibrated to DCI-P3 with LG Calibration Studio / Spider 5 | Dell 27“ 4K iPad Air Gen 5 (2022) A2589 Special interest into procedural texture filter, edit alpha channel, RGB/16 and RGB/32 color formats, stacking, finding root causes for misbehaving files, finding creative solutions for unsolvable tasks, finding bugs in Apps. I use iPad screenshots and videos even in the Desktop section of the forum when I expect no relevant difference.
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