Something curious is happening. Here's an exported image from UF. Looks right.
63acf59841f13.jpg

Here's what I get when rendered (normal anti-aliasing, forced linear drawing).
63acf65eaae82.jpg

Noticeable differences, not subtle. Not solved by changing anti-aliasing parameters or precision. And if I render the same thing again, different results!

63acf6c219090.jpg

These are done with all 12 of my CPU's cores (6 real cores). If I allow only 1 core, it's repeatable.This seems right except for a bit of black in the lower left corner.

63acf7a9b0772.jpg

Here's the upr (I've just updated jlb.ulb, so you'll need to update your formulas to compare.) Do others get similar results? Is this a UF bug or do I have a problem?

Thanks for trying.

test {
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LSJKvhA0m4z33hknb8Qauih954wPe9VOOcKPkgGwJZ8BO7oB8NIPXXnNE66Nc5vGizJsMEoA
tPjEQ5ZoB/ONy5zhbJ/CAOGuYM0FCH4gj5UcIFnRjXjyJZXflkrcc8xpcaSMawXL+IHB6kUs
PlnjAixIiw3kEgCpxEM76riwppCdoISi5EGydkLY60FTE/M2dEYGcxkZTcn5EhXHLEOZy1Xt
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xABbqh0lpJ7EWA4YD8lM9Lmd6ovPYPavGipLjwxB5Fu3miy4YGH5qdEFSJkA0QwI4MtAWt8p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}

Something curious is happening. Here's an exported image from UF. Looks right. ![63acf59841f13.jpg](serve/attachment&path=63acf59841f13.jpg) Here's what I get when rendered (normal anti-aliasing, forced linear drawing). ![63acf65eaae82.jpg](serve/attachment&path=63acf65eaae82.jpg) Noticeable differences, not subtle. Not solved by changing anti-aliasing parameters or precision. And if I render the same thing again, different results! ![63acf6c219090.jpg](serve/attachment&path=63acf6c219090.jpg) These are done with all 12 of my CPU's cores (6 real cores). If I allow only 1 core, it's repeatable.This seems right except for a bit of black in the lower left corner. ![63acf7a9b0772.jpg](serve/attachment&path=63acf7a9b0772.jpg) Here's the upr (I've just updated jlb.ulb, so you'll need to update your formulas to compare.) Do others get similar results? Is this a UF bug or do I have a problem? Thanks for trying. test { ::wlqy3in2tq1WvttNU43DQ+PI43ttIttsbH4DtJNZboJAbJBotYAGMS02cV3GFdck/1PKSJbL LSJKvhA0m4z33hknb8Qauih954wPe9VOOcKPkgGwJZ8BO7oB8NIPXXnNE66Nc5vGizJsMEoA tPjEQ5ZoB/ONy5zhbJ/CAOGuYM0FCH4gj5UcIFnRjXjyJZXflkrcc8xpcaSMawXL+IHB6kUs PlnjAixIiw3kEgCpxEM76riwppCdoISi5EGydkLY60FTE/M2dEYGcxkZTcn5EhXHLEOZy1Xt KhFtNELZFhfnWQrQ5pEm/Gi/PRJrW5siGSixRil8fH+6otriGUAXMGsc0gn2R5+buJJ61k7U KbgT6y3W28zLUcBx0llj6Nh4ssSlG+6H/9v+5TZNoJ2RvtcNJmwo+qJ55CX12AJknRjSDJZy xABbqh0lpJ7EWA4YD8lM9Lmd6ovPYPavGipLjwxB5Fu3miy4YGH5qdEFSJkA0QwI4MtAWt8p SjLoud8xE+GR0Ql0BtztudtTsV/ehNoTwlzk9P1aUwoYAC0c5TfFTDRxJatN0XfOPVEU+DnA 6bE2aS2ANgKlVMsu6txFQ4FaKKJQjUc8aR2uBq+Jxlq/LD9a1WAr7ge5b25bg9w3A7jvpA8x JBCCBQ48OYku8BphSrDpOQZgr7oZjHK+nOQvSMRqbdeeXytURmRsvwpaB7eZkKJwZ44sCQ2T ZbGh1faidCKqiLtwTthRZBqOtynAWEd9dS24HTGL+PnRF/Yldb171N83+HbxBQLp2frukTln FBBAXwHsl3Bzo7HA2OYiMaC6hkALhnJ2rmEvsc7T7s/CaBtvfrlaxcdGdo/HhfC9p4cLhL2X T1NiNLHh/5ictlEvM/ri8Rn8C3exUWXyePtkTWPcxF4pF1659kEPMZttUyPLZ8JhXmRsLbM/ CcZ5Xo3Kve2onlkk+I1aySGZUR+L0SwbSY09WjW6KtF8FVYI//lCD5VFGmaLea8yktc0Xo8N EmlcKPMxNJMGxnTCskm9lVEGjklZ+4QSPMfXWho8/LFiyv4CR5XQho8eWIK/SKEl3nCR4ggn Foi7MDlGjDf55+5eOwpXNRdg1WONUc63Lh8PpxitLDCsEu0J+1yTW74sqbG3hElqi5Wq/tPX vSvaoeR0e5zqF3fVoIW0A7U2F5F2epOCJxe3K8pkbscFqQkpJaQ2etgNcmZDwfFBsGOB0DdT giy72rbsh5R6SbON7hDzCXoXJteU22OJ7ZHklGXs1r62ukuI52exEnskQaAaKcxspeTnNXAV sXTTsqbl6A65LgTmUcxYHvKpnElmDwsgRb9DP9+kuXFIfPDHQFf0NJhit1jXX2Ekf5fq5qjq q23GjGXg05Sr+7jR0N4XOx6E5p7gAaIWZZkX4XTuyLSa8+lpMybNEWzLWX0KBt9iqV1/07QZ 04N6wf3ddYQkA0kmrBlhCCNRe0uMfi2R8OkfSmp5b6xLn7s1+LP35dI0ghuCn6A15CTBzKbg E6p3JgnWIndJAmAARPaERjD3/k8+PhDMTwODi5jxrH7Juc3JtAseb2GSOKxW1a9YXTIqf4ft QM1hZbgtfdbsTSzor39oZcZtEYY44qtMon2ZoGYnfs0boM/Qi5oocLNp59waW7InzhtpUpNU NHNBJt6kfalafYYenhh5jYtOWlHatlFNvV+MMnmgAmE32mFKElnW83kb4b0ed8ceal34sd6R Zf2Wefz2y7V2WulZb5Wktlbb2W9zh1cf9jdGWXAfXSBRdcEtQ/AN+B87GG3ggIasmoDxnL4Y wBkdo1GDmG5speJh7Z0A97rYnT3ev95u5DXGsGY6v2GNAt6ia0wTGA9nEfxketoZamRgpYWx 3b7nT4bMoJ1ROJr4tOYQ0XCWT0LftwHIihAGVAThQvwWqUoMRkQu4MXGE2e+fFm0KQGMSmqy o4bfgUPjmssyxRsV1NaBSWrmiOLYcyYZocxhsUgp00yvS1mK+svr4b/23/hxUXgdmcg9mbwZ maDgar2sCRmpAJQ32WQbN9s/2mF4MZjkY72GVBzCbUJ02tRKQtZjUI0ajUia1GVq/ui9gGj9 gGi9g23LpEudhfQ7D/gW0IpCXb9RqQYoNSlQr6iUBtlmIVAYtNQmah8wql3GbTNQqk2xuCwO afs0M1WddoNbeA7R1fYPL/D7T9foFbAA7eHAolbBA7YPgkIyScYIagznCD1mEpeeRTb85bS2 FhjzN2DYBNd5wl8g6do7KfeINEkujjO8QQObdGtNkjCactV3Lv2qGwf1Uby+yxewviZRJxUf nPJst41kBNAejKazT76+n00l430at33Vfxy74F9Yx1k2Y9reXZ6YV8EnKShAwFNkxI+0UZ8R 11OKvm1soERjky3TGLhjlPSwhFPINacA5dkQRS1gAeg5ezmvo8znJf9JlicnsAMZuXpoFT1T BAmUJYin38yvr3SZT9OQamIDbxkKBef4MSlCGW+ok0OUDBzhGoJ6J/sR64sYIA4Zg2CD2hhe nOLcnO1zb2sKZTmYg0sGGiyXj5puERYjCu7h3qJcmIs/fx3w5ZH= }
 
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Hi Jim. Same thing here. Top is export with no glitches. Middle and lower are renders, both glitchy, but different in the lower left corner.
63ad05dc4afbc.jpeg
63ad05dc581d4.jpeg
63ad05dcd435e.jpeg

Hi Jim. Same thing here. Top is export with no glitches. Middle and lower are renders, both glitchy, but different in the lower left corner. ![63ad05dc4afbc.jpeg](serve/attachment&path=63ad05dc4afbc.jpeg) ![63ad05dc581d4.jpeg](serve/attachment&path=63ad05dc581d4.jpeg) ![63ad05dcd435e.jpeg](serve/attachment&path=63ad05dcd435e.jpeg)

http://www.youtube.com/fractalzooms

 
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No, it's not just you, it's even worse here. I see glitches both on renders and onscreen (and thus the exports too). Re-drawing the screen changes the result onscreen every time. I have yet to see a non-glitch version!

I saw something similar to this some years ago which rather ruined a design I was working on. I think the cause was attributed to the CPU at the time. I never found a solution. :|

My CPU is an AMD Ryzen 9 3950X.

63ad7f730d55d.jpg

No, it's not just you, it's even worse here. I see glitches both on renders and onscreen (and thus the exports too). Re-drawing the screen changes the result onscreen every time. I have yet to see a non-glitch version! I saw something similar to this some years ago which rather ruined a design I was working on. I think the cause was attributed to the CPU at the time. I never found a solution. :| My CPU is an AMD Ryzen 9 3950X. ![63ad7f730d55d.jpg](serve/attachment&path=63ad7f730d55d.jpg)

Chris Martin
Gallery: Velvet--Glove.deviantart.com

Currently using UF6.05 on Windows 11 Professional 64-bit

edited Dec 29 '22 at 12:13 pm
 
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Apple M2 below. As before, the export looks fine but the renders are glitchy and different. My previous post was with an I7 8700B. I used the Mac version of UF for both sets.

My exports look like each other but they don't look like Jim's export. The middle right section of Jim's has a staircase between the vertical blue bands which are 2nd and 3rd from the right. My exports have a straight line there instead.

63ae11d02ad6f.png
63ae11f774711.png
63ae11fb6e969.png

Apple M2 below. As before, the export looks fine but the renders are glitchy and different. My previous post was with an I7 8700B. I used the Mac version of UF for both sets. My exports look like each other but they don't look like Jim's export. The middle right section of Jim's has a staircase between the vertical blue bands which are 2nd and 3rd from the right. My exports have a straight line there instead. ![63ae11d02ad6f.png](serve/attachment&path=63ae11d02ad6f.png) ![63ae11f774711.png](serve/attachment&path=63ae11f774711.png) ![63ae11fb6e969.png](serve/attachment&path=63ae11fb6e969.png)

http://www.youtube.com/fractalzooms

 
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Try going to View/Preferences/Fractal and setting the minimum and maximum cores to 1. (I don't know how many cores are in modern Apple CPUs.)

Try going to View/Preferences/Fractal and setting the minimum and maximum cores to 1. (I don't know how many cores are in modern Apple CPUs.)
 
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If I render (using only 1 core) at 2000 by 2000 instead of 1000 by 1000, the extraneous dark bits in the lower left of the image (as seen in image #4 in the original post) are not there, correctly. Odd.

If I render (using only 1 core) at 2000 by 2000 instead of 1000 by 1000, the extraneous dark bits in the lower left of the image (as seen in image #4 in the original post) are not there, correctly. Odd.
 
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With max threads and min threads both set to 1, my 600x600 renders are still pretty glitchy but are now identical. Here’s one:
63af5887d68b3.png

At 2000x2000, still glitchy but better:
63af589a10e82.jpeg

Here’s a 2019 post where Phillip had a similar issue. After a lot of testing, he found a thread setting and image size which rendered cleanly.
https://www.ultrafractal.com/forum/index.php?u=/topic/633/certain-image-widths-and-thread-counts-cause-center-part-of-image-to-be-rendered-first/post-1887#post-1887

With max threads and min threads both set to 1, my 600x600 renders are still pretty glitchy but are now identical. Here’s one: ![63af5887d68b3.png](serve/attachment&path=63af5887d68b3.png) At 2000x2000, still glitchy but better: ![63af589a10e82.jpeg](serve/attachment&path=63af589a10e82.jpeg) Here’s a 2019 post where Phillip had a similar issue. After a lot of testing, he found a thread setting and image size which rendered cleanly. https://www.ultrafractal.com/forum/index.php?u=/topic/633/certain-image-widths-and-thread-counts-cause-center-part-of-image-to-be-rendered-first/post-1887#post-1887

http://www.youtube.com/fractalzooms

 
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My problem was only during rendering, after waiting, everything came out fine. I doubt that this issue is related since the end results differ. I'll have a look at the params since this is making me curious.

My problem was only during rendering, after waiting, everything came out fine. I doubt that this issue is related since the end results differ. I'll have a look at the params since this is making me curious.
 
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I'll have a look at it to see what's happening here.

I'll have a look at it to see what's happening here.

Ultra Fractal author

 
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