Hi all,

How to covert negative images to positive images

I have posted this question before but I couldn't find a reliable solution.

Running on Terminal
Code:
$ convert -negate source.png target.png
But the quality of the positive images converted are poor.

Steps performed by me creating the negative images on films
1. Use a 12" tablet as light box
2. Mount the film on film holder
3. Place the film holder on top of the tablet
4. Take photos with a mobile phone camera mounted on a tripod

I have no problem taking negative images from films but I couldn't find a solution converting the negative images to quality positive images.

Please help or advising me where I should post my problem for a solution?

Thanks in advance

Regards