12-03-2020, 09:09 PM
Re faded areas, I read into this (again) recently. There is something you can try in photoshop or the like, without special equipment and direct access. I found it here (first topic): You are not allowed to view links. Register or Login to view.
"The processing method used was to highly stretch the contrast of the difference between the red and green separations of the colour image. The difference image had a lower dynamic range than either of the two individual images and was centered roughly around zero. A Gaussian function was fit to the histogram by measuring the mean and standard deviation of the image. The difference data was then linearly stretched to black and white from ±3 standard deviations around the mean, clipping any values outside of that region. A blueyellow colour map was used display the final result."
I think this was done using the matlab software, but I don't see a reason why it could not be accomplished with gimp or photoshop - with a little bit of fiddeling. As it seems, we could have a lot of time at our disposal in the near future.
"The processing method used was to highly stretch the contrast of the difference between the red and green separations of the colour image. The difference image had a lower dynamic range than either of the two individual images and was centered roughly around zero. A Gaussian function was fit to the histogram by measuring the mean and standard deviation of the image. The difference data was then linearly stretched to black and white from ±3 standard deviations around the mean, clipping any values outside of that region. A blueyellow colour map was used display the final result."
I think this was done using the matlab software, but I don't see a reason why it could not be accomplished with gimp or photoshop - with a little bit of fiddeling. As it seems, we could have a lot of time at our disposal in the near future.