What's the formula used to calculate the brightness of a certain pixel in PowerPoint image modification?

Hi John Johnson,

Thank you for your question.

From the information available, there does not appear to be publicly documented information that describes the exact formula PowerPoint uses internally when applying Brightness and Contrast adjustments to individual image pixels. The community forum and product documentation currently do not provide details on how an original RGB value is mathematically transformed after these image corrections are applied.

If your goal is to reproduce PowerPoint's image-processing behavior programmatically or verify the resulting pixel values, you may need to perform empirical testing by applying specific Brightness and Contrast settings to sample images and comparing the output values. This can help identify whether PowerPoint uses a standard image-processing algorithm or a product-specific implementation.

I hope this helps clarify the current information available. Let me know if you need further assistance, feel free to ask me by clicking "Add Comment" or "Add Answer" if you cannot add comment so your response will be visible. Thanks for your effort.

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