P: Black Point Picker in the Curves adjustment works different from Curves Adjustment Layer

@Sameer K , further testing revealed that the problem is not connected to the Layer Mask or Grayscale image, but the Black Point Sampler for Image > Adjustments > Curves malfunctions if the White Point has already been set, even in an RGB image. 

I marked the values in the Info Panel and the feaulty results in the Curves dialog with red outlines in the gif. 

The same does not appear to happen with a Curves Adjustment Layer. 

I've verified that this behavior is consistent all the way back in 2021.

By @Sameer K 

At least in Photoshop 2024 the behaviour is not the same as in Photoshop 2025 and clicking with the Black Point sampler will cause the intended change. 

Please see the new gif below whch combines recordings of Photoshop 2025 and Photoshop 2024. 

The black point should be set at the actual value of the selected pixel. 

In the gif I clicked in the field containing Color Sampler #5 – so the field containg Color Sampler #4 should not turn black. 

#5 originally has the value 77%, but the value that is being set to black is not 77% but 65% (see screenshots). 

I tested in Photoshop 2024 and the result is correct there. 

Hey, @c.pfaffenbichler. Thanks for adding the GIF. I've verified that this behavior is consistent all the way back in 2021. Could you also share a reference of how it should work and a detailed description of how the way it is working right now isn't expected behavior?