Nobody can know with knowing the original and 400px is simply not enough resolution for any serious forensics. If there is any microscopic writing, it would be belnded down to clumps of 2 or 3 pixels at most, making it impossible to discern any letters. And in your case it could simply be the paper structure, anyway.
Thanks for that information it's much appreciated. I neglected to mention that the original digital image was 400DPI, I don't know what if any difference that makes.
If I may ask you another question, micro writing as the name suggests is extremely small, an example would be Lincoln's entire Gettysburg address written on to a strand of human hair some 3.5 inches in length. This was done by a man called James W. Zaharee in the 1930s. Do the same rules apply given the tiny size of the writing and the 400 DPI image? I simply don't have the experience to make that call but I had a thought as a result of your advice that I could experiment by creating an image with micro writing and at 400 DPI, draw over the letters with a felt tip or similar and see what happens. Do you think that would be valid?
Is it a certainty that there is microscopic writing here? Frankly it just looks like overenhancement of the varying amounts of pigment deposited because of the texture of the material it was written upon.
Perhaps the scanning can be done at higher than 400 pixels per inch if you're trying to derive ultra-tiny detail.
(confirming Noels opinion)
The original image, as posted here, has 1802 x 1440 pixels, a fairly good
scan in my opinion. There is nowhere any evidence for micro writing under
the marked text - if so, then we should expect such hidden hieroglyphs
as well at other locations.
The next step should be the deciphering of the enigmatic message -
that result would be interesting, IMO.
But it's already too late - referring to the apocalypse...
Best regards --Gernot Hoffmann
Many thanks Gernot,
Quite right I had entered the wrong dimensions, all comes from doing too many things at one time.
I have examined other letters and have found characters and numbers in various locations beneath letters as well as on the main body of the scan. My problem has been enhancing the images found to a level that they become sharper and easier to view.
If I may ask, given that the main image is at 400 DPI and I find traces of other markings beneath a letter is it then possible to remove pixels of different shade to enhance what is found?
This is the last letter in the 4th line, 'C'. I make this to be JESTYN with the letter N partially concealed behind the serif/rocket at the bottom right. This is either correct or an amazing coincidence that these 'letters' showed up, as a person with the nickname JESTYN was closely associated with the case.
Your comments on the message are correct, it would be great to decipher its meaning. The thoughts have been that it is a one time pad encryption which would make it just about impossible to decipher without the key word or phrase.
Happy to produce other images with better visibility but please bear in mind that the problem I have is making them clearer to see.
I must have missed the apocalypse, too busy at the time, I'll try to make the next one
Best Regards and thanks
Try using a Curves adjustment layer and altering the curves to see if you can increase the contrast greatly between shades that are close together.