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thanks protozoan! I change it to TIFF and.. done! no more problem.
wait second..if houdini automatically linearize JPEG. I don't need to convert it! :shock: how stupid i am..

I have two texture,one is normal JPEG, and other one is Gamma corrected use Photoshop(Gamma -> 0.45),also saved as JPEG.
I created two materials, one use linearized texture as color map.
and then I import that normal JPEG to cop and use “Linearize Non-Linear images” function under file node.
the two textures should be same, but turns out it's not. the first one which is used linearized texture is darker than other one.
what's the problem here? Does Houdini automatically linearize all JPEG even the JPEG is already linearized? what part I did wrong?