Fix greyscale computation and inverted coords #8905
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CaedenPH
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Jul 29, 2023
Good idea, thanks. done :) |
tianyizheng02
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Jul 29, 2023
tianyizheng02
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Jul 29, 2023
| """ | ||
| return 0.114 * blue + 0.587 * green + 0.2126 * red | ||
| return 0.114 * blue + 0.587 * green + 0.299 * red |
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according to Internet, it's either (0.2126R + 0.7152G + 0.0722B) or (0.299R + 0.587G + 0.114B)
Could you add a source for these numbers so that we can avoid mistakes like this in the future?
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Good idea, done :)
tianyizheng02
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Jul 29, 2023
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Sep 15, 2024
* Fix greyscale computation and inverted coords * Fix test * Add test cases * Add reference to the greyscaling formula --------- Co-authored-by: Colin Leroy-Mira <colin.leroy-mira@sigfox.com>
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Hello there,
I've used your algorithm to re-implement it in C for a side-project of mine, and noticed two little bugs in it:
the luminance calculation is incorrect - according to Internet, it's either (0.2126R + 0.7152G + 0.0722B) or (0.299R + 0.587G + 0.114B). Here, we had a mix of both (and the greyscale value could never reach 255.
the current_error setting used inverted coordinates.
Hope this helps!