PS 2025 (v26.1.0) Adjustment LEVELS not working properly

[Stephen252069060a2u]

I am migrating from PS CS6 to 2025 (v26.1.0) .

Using the Adjustment LEVELS operation on my Astro photos no longer works properly (or the same way it use to work in CS6). When I try to adjust the sliders to bring up the pixel levels in the image , The shadow level slider seems to wipe out the dimmer pixels instead of adjusting the base black level.

I can take the same image , do the same LEVELS adjustment in both versions of PS and get entirely different results. 

Running on a Win 11 Pro PC, 64bit, 13th Gen Intel Core i9-13900KF, 64 gig ram, Ge Froce RTX 4070TI , 2TB main drive,  10tb D drive.

I would expect LEVELS to handle a image the same way in both versions of PS.

I have attached the images processed with CS6 and 26 with the same LEVELS adjsutments to show the problem.

Any Help on this?

Thanks 

sk

[Jeff Arola]

Is your tif image 32 Bits/Channel?

[Stephen252069060a2u]

original image is 32bit but I have the same issue even if I convert it to 16bit/channel.

The files uploaded were converted to 16 bit .

[Stephen252069060a2u]

After double checking PS 2025 and CS6 with a 16bit image , both instances of PS LEVELS seem to display the same graph of intensities and allow me to adjust the same way.

They do not work the same with the image in 32 bit mode.

From my experiments, PS 2025 does not present the correct LEVELS display in 32 bit mode.

I guess I will just work images in the 16 bit mode.