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Editorial Team
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Editorial Team
Asked: May 22, 20262026-05-22T15:13:49+00:00 2026-05-22T15:13:49+00:00

In particular, I have 2 vectors that have been filled by integers between 0

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In particular, I have 2 vectors that have been filled by integers between 0 and 255 and a gray scale image.
I want to change the gray level of pixels of the image that matches with vec1[i] to vec2[i].

Do you know any function or fast procedure that can perform this in OpenCV?

I couldnt find a built-in function that returns all pixels with a specified gray level in OpenCV.

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  1. Editorial Team
    Editorial Team
    2026-05-22T15:13:50+00:00Added an answer on May 22, 2026 at 3:13 pm

    That is known as a lookup-table transform, and that exists in opencv (link to documentation). You will have to adapt your input format a bit though .

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