: An old question seemed to raised on top by the system. Maybe one answer still is needed. Here it is. Obviously the questioner has compatible images. That means: both have the wanted final

@Holmes874

An old question seemed to raised on top by the system. Maybe one answer still is needed. Here it is.

Obviously the questioner has compatible images. That means:


both have the wanted final resolution or more
the papers can be put to fit geometrically with minimal distorting jobs
the ruled paper has no own shadows
both have good exposure and acceptable white balance (the ruled paper can be black and white)


Here are two shots that are compatible:



At first there were 2 background removals. The ruled paper and hand with the pen are needed separately. The plausibility of this fraud is lost totally, if the hand and the pen aren't separated surgically. I used the quick selection tool + fixed the edges with the polygonal lasso. As well I could have made a clipping path - so inaccurate are all automatic methods.

At the bottom there's the Writing on the white paper layer. It has a dedicated curves adjustment layer. The purpose is to lift the paper as white as possible without losing the writing nor the shadows.

The next layer is the ruled paper (in my case the squared paper). The blending mode = multiply. The idea is to darken the writing layer with the squares. Multiply does not make anything brighter, only darker. So there's added also a dedicated (=pointed to single layer) curves layer to keep the paper white, but the squares dark enough.

On top there is the separated hand with the pen.

Here's the result until this:



If we temporarily disable the contrast boost of the writing layer, the shadows get lost under the squares:



So, we keep the contrast, but it's not ready. Altough the squared paper was dragged to optimal position, the edges do not fit.

The easiest fix is to clip all to straight and clone the background or white paper to fill the holes. The squared paper is quite straight and larger than the white paper, so that was done. Here's the result:



Another fix is to warp the paper edges to fit. I tested it. In the following screenshot the warping is done to save the bended edge.



Actually the squared paper is warped, the white paper was expanded by cloning and partly clipped off + replaced with cloned table.

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