Talk:Ordered dithering: Difference between revisions
Edit made on behalf of 81.143.195.229 (talk) because it was disallowed by an edit filter. Original summary was "Removed IABot's 'External Links Modified' post, as it is the only post on this talk page and permission has been granted to remove these posts." (effp-helper) Tag: Replaced |
→The current version of the matrices is incorrect.: new section |
||
| Line 1: | Line 1: | ||
{{WikiProject Computing}} |
{{WikiProject Computing}} |
||
== The current version of the matrices is incorrect. == |
|||
If you look at the 4x4 matrix here https://wikimedia.org/api/rest_v1/media/math/render/svg/3c62838dbbd378c058444a60b9c803b9bb4ee09c you will see that it it results in thresholds at 0/16, 1/16, etc up to 15/16. A threshold makes a decision if something is in a range below it, or greater-than or equal to it. The thing is there's no way for anything to be below 0, so the threshold 0/16 is useless. The problem also exists for the other matricies shown in this article. Also, regarding the 4x4 matrix, there are only 16 ranges of values using this incorrect matrix, while the picture at https://upload.wikimedia.org/wikipedia/commons/e/e5/Ordered_4x4_Bayer_matrix_dithering.png clearly indicates that the 4x4 threshold matrix should produce 17 ranges of values. This is how I know that the matrix used here is incorrect. Fortunately, an earlier version of the ordered dithering article has the correct matricies. The last version of this article to have the correct matricies is https://en.wikipedia.org/w/index.php?title=Ordered_dithering&oldid=665270162 |
|||
As you can see. The correct 4x4 matrix has thresholds at 1/17, 2/17, etc up to 16/17. I recommend that the original matricies be put back in the article, as these were correct. |
|||
[[User:Benhut1|Benhut1]] ([[User talk:Benhut1|talk]]) 21:02, 6 November 2020 (UTC) |
|||
Revision as of 21:02, 6 November 2020
 | Computing Unassessed | |||||||||
| ||||||||||
The current version of the matrices is incorrect.
If you look at the 4x4 matrix here https://wikimedia.org/api/rest_v1/media/math/render/svg/3c62838dbbd378c058444a60b9c803b9bb4ee09c you will see that it it results in thresholds at 0/16, 1/16, etc up to 15/16. A threshold makes a decision if something is in a range below it, or greater-than or equal to it. The thing is there's no way for anything to be below 0, so the threshold 0/16 is useless. The problem also exists for the other matricies shown in this article. Also, regarding the 4x4 matrix, there are only 16 ranges of values using this incorrect matrix, while the picture at https://upload.wikimedia.org/wikipedia/commons/e/e5/Ordered_4x4_Bayer_matrix_dithering.png clearly indicates that the 4x4 threshold matrix should produce 17 ranges of values. This is how I know that the matrix used here is incorrect. Fortunately, an earlier version of the ordered dithering article has the correct matricies. The last version of this article to have the correct matricies is https://en.wikipedia.org/w/index.php?title=Ordered_dithering&oldid=665270162
As you can see. The correct 4x4 matrix has thresholds at 1/17, 2/17, etc up to 16/17. I recommend that the original matricies be put back in the article, as these were correct.