CS6 / Mac : I want to placate hand writen words on a jpg image.

Question

CS6 / Mac : I want to placate hand writen words on a jpg image. The words are to be extracted from a letter I photographed on jpg. I guessed that was asked before, if anyone can redirect me to an appropriate tuto I didn't find yet. Thx.

Answer 1

Plonk, what I gave you was a very quick and easy way to achieve your goal, but it was, perhaps, simplistic.  But without seeing the underlying image, or the scanned letter.  My method relied on the text being black, and the paper it was written on being as near white as possible.  It also need the underlying image to have no large areas of very dark tones, or obviously the black text will not show against it.
So to make it a decent test, I found this crumpled letter with a very off white background:
Adding a Levels Adjustment layer, and setting it thus:
I can move all those off white tones (as indicated by the right side of the histogram) to full white, like this
Notice the red arrow on the Levels Properties.  Clicking on that icon clips it to the letter layer beneath it, so that it _only_ operates on that layer and no others.  This is important. Incidentally, you should also set the levels layer's Blend mode to Luminosity - this prevents colour artifacts creeping in.
Placing the scanned letter layer, with its clipped Levels adjustment layer, we get the following.  On the left the Letter layer Blend mode is set to Multiply.  You could also use Darken (I bet you can workout why that would work) but Multiply gives a more solid black.  The second example has the Blend mode set to Divide.  This is a useful trick because it still gives contrast over dark tones, but the text would start to get thin where it overlays very light tones.  The third example is the original letter with no Levels layer.
If you work in layout, you'll know that editors chose their images with overlaid type in mind.  It would be fairly trivial to make the type black over light tones and white over dark tones by using layer masks with two type layers.  You select either the dark or light area, and add a layer mask to the appropriate type layer.  Then copy the mask to the other type layer and invert it.  That ensures a perfect transition from one to the other.