PNG Image perspective with shadow change error

[NaveenSelva-95]

I am try to change the perspective of the png image which have small shadow on but after applying the perspective the shadow level getting increased.

I It is my output image

this my input image

[flozz]

This is due to the "tricks" used for generating a perspective without using any 3D matrix. I am not sure this can be fixed :(

[skizzo]

Could you share the code of how you create this image with a shadow?