InPS6, you have a perspective option on the options bar of the crop tool. Turn that on and you can move each corner of your crop separately. Once they are placed like you want them, double click inside the crop or press return or enter.
As the side that is further away contains less information (shorter line=less pixels), you better start with an image that is too big in size because deleting info is less harmful than having to invent new data.
You can also use this to straighten out photographs you took from framed drawings and paintings without being perfectly in front of them, i.e. when the protecting glass that's placed in front of them reflects you and your camera.
As the side that is further away contains less information (shorter line=less pixels), you better start with an image that is too big in size because deleting info is less harmful than having to invent new data.
You can also use this to straighten out photographs you took from framed drawings and paintings without being perfectly in front of them, i.e. when the protecting glass that's placed in front of them reflects you and your camera.