g t Posted May 18, 2018 Share Posted May 18, 2018 (edited) I noticed that at certain zoom levels the pixel grid is rendered unevenly. This gives the image a 'speckled' appearance as if it had light grey dots all over it. The effect is easily seen when using Ctrl+Scroll on the mouse wheel to zoom. Attached is a zoomed version of the problem, at a zoom level around 480%. I noticed this with and without hardware acceleration. To reproduce: 1. Start with new image (white background) and pixel grid enabled 2. Ctrl+Scroll mouse until around 400%-500% zoom (I was at 448% but visible at other zoom levels) --> pixel grid has speckled appearance Issues/Expectations It seems that there are a few issues that cause this effect: 1. when two pixel grid lines overlap they get darker -> expected: pixel grid should have a uniform color 2. adjacent pixel grid lines do not necessarily have their pixels in the same position, causing a seemingly random (Moiré-like) pattern -> expected: pixels in adjacent lines should line up 3. the pixel grid spacing varies, probably due to rounding. The attached example shows a spacing of either every 4 or 5 pixels. -> expected: hard to avoid. perhaps a different zoom mode that only allows zoom levels that result in a uniform pixel size? Otherwise, perhaps solid lines could be used below a certain zoom level to avoid the dotted line Moiré effect. Diagnostics Application paint.net 4.0.21 (Final 4.21.6589.7045) Build Date Montag, 15. Januar 2018 Install type Classic Hardware accelerated rendering (GPU) True Animations True DPI 96,00 (1,00x scale) Language en-US OS Windows 7 Enterprise Service Pack 1 x64 (6.1.7601.65536) (0x4) .NET Runtime 4.0.30319.42000 Physical Memory 16.263 MB CPU Intel(R) Core(TM) i7-6820HQ CPU @ 2.70GHz Speed ~2712 MHz Cores / Threads 4 / 8 Features DEP, SSE, SSE2, SSE3, SSSE3, SSE4_1, SSE4_2, XSAVE Video Card NVIDIA Quadro M2000M Dedicated Video RAM 4.034 MB Dedicated System RAM 0 MB Shared System RAM 7.875 MB Vendor ID 0x10DE Device ID 0x13B0 Subsystem ID 0x80D5103C Revision 162 LUID 0x0001CBCC Flags None Outputs 2 Video Card Intel(R) HD Graphics 530 Dedicated Video RAM 192 MB Dedicated System RAM 0 MB Shared System RAM 1.632 MB Vendor ID 0x8086 Device ID 0x191B Subsystem ID 0x80D5103C Revision 6 LUID 0x0001CEE3 Flags None Outputs 0 Edited May 18, 2018 by g t Quote Link to comment Share on other sites More sharing options...
Rick Brewster Posted May 18, 2018 Share Posted May 18, 2018 The pixel grid can't render perfectly at non-integral zoom levels. It's just the nature of rendering with a finite number of pixels. Quote The Paint.NET Blog: https://blog.getpaint.net/ Donations are always appreciated! https://www.getpaint.net/donate.html Link to comment Share on other sites More sharing options...
g t Posted May 22, 2018 Author Share Posted May 22, 2018 Thanks for the reply. I understand that the uneven spacing between grid lines is probably unavoidable. However, issue #1 (that grid pixels get darker when plotted on top of each other) seems like a minor bug. Issue #2 (that grid pixels do not line up) would seem to me to be avoidable too (probably depends on the algorithm), so any 'errors' would at least be distributed evenly across the grid. An attached zoomed in image shows these two problems more clearly, so the upper horizontal line starts at offset 1 and the lower at offset 0. If this solution is too difficult, I would suggest again using solid lines at non-integral zoom levels. The uneven grid rending is very distracting when editing zoomed images as it appears the image has 'randomly' scattered light grey pixels on an otherwise white background. Quote Link to comment Share on other sites More sharing options...
Rick Brewster Posted May 22, 2018 Share Posted May 22, 2018 Okay, I see what you mean. I've filed a bug to investigate this at some point, although I'm not sure when it'll float to the top of the queue Quote The Paint.NET Blog: https://blog.getpaint.net/ Donations are always appreciated! https://www.getpaint.net/donate.html Link to comment Share on other sites More sharing options...
g t Posted May 24, 2018 Author Share Posted May 24, 2018 Great, thanks! Quote Link to comment Share on other sites More sharing options...
Rick Brewster Posted September 26, 2018 Share Posted September 26, 2018 I've got a fix for issue #1 that'll be in the upcoming 4.1.2 update. This was pretty easy to fix by rendering to a layer* first at full opacity, and then composing the layer on top of the canvas with the desired opacity. Compare this to 4.1.1 and earlier where the grid pixels were all drawn directly to the canvas at the desired opacity -- so, as you saw, grid pixels that overlapped would get darker. * a Direct2D layer, not a Paint.NET layer Quote The Paint.NET Blog: https://blog.getpaint.net/ Donations are always appreciated! https://www.getpaint.net/donate.html Link to comment Share on other sites More sharing options...
VL4DST3R Posted August 24, 2022 Share Posted August 24, 2022 On 9/27/2018 at 12:51 AM, Rick Brewster said: I've got a fix for issue #1 that'll be in the upcoming 4.1.2 update. This was pretty easy to fix by rendering to a layer* first at full opacity, and then composing the layer on top of the canvas with the desired opacity. Compare this to 4.1.1 and earlier where the grid pixels were all drawn directly to the canvas at the desired opacity -- so, as you saw, grid pixels that overlapped would get darker. * a Direct2D layer, not a Paint.NET layer Sorry to revive this old thread but i either never noticed it or this issue seems to be back at least as of 4.3.12? i haven't checked in a while as i rarely work with pixelart. Having grid enabled still seems to generate some funky patterns when zooming out past a certain point: (increased contrast for the sake of visibility) Not sure if it's the same scope as the original issue but i reckon an easier fix would be to stop rendering the grid at smaller zoom levels entirely, say, under 600% zoom, similar to how photoshop does it, showing it only when you actually go in up close. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.