# What exactly is meant by % brightness in the augmentation?

**URL:** <https://discuss.roboflow.com/t/what-exactly-is-meant-by-brightness-in-the-augmentation/4965>\
**Category:** 🤝  Community Help\
**Created:** [March 24, 2024, 1:34am UTC](https://discuss.roboflow.com/t/what-exactly-is-meant-by-brightness-in-the-augmentation/4965 "2024-03-24T01:34:51Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Jeff\_Cochran](https://yyz1.discourse-cdn.com/flex029/user_avatar/discuss.roboflow.com/jeff_cochran/32/3965_2.png) [@Jeff\_Cochran](https://discuss.roboflow.com/u/Jeff_Cochran)\
**Post date:** [March 24, 2024, 1:34am UTC](https://discuss.roboflow.com/t/what-exactly-is-meant-by-brightness-in-the-augmentation/4965/1 "2024-03-24T01:34:51Z")

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A couple questions regarding the meaning of X% of brightness/saturation/exposure for data augmentatio in roboflow.

1. When you select +/- X% of brightness/saturation, what _exactly_ is this a percentage of? The maximum possible brightness/saturation value, i.e., the maximuim possible V or S in HSV?
2. Is a single % adjustment applied to all pixels in the image? Or is a different adjustment value computed for each pixel?

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**Author:** ![system](https://canada1.discourse-cdn.com/flex029/uploads/roboflow1/original/1X/bb6edbfa56d0cf2ee603f061e9e09103502cc8cc.png) [@system](https://discuss.roboflow.com/u/system)\
**Post date:** [April 14, 2024, 1:35am UTC](https://discuss.roboflow.com/t/what-exactly-is-meant-by-brightness-in-the-augmentation/4965/2 "2024-04-14T01:35:36Z")

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