What program did you use for inverting the negatives? I build a similar solution, but currently only for positives.

On Linux something like Imagemagick would do the job and can be scripted. Complication is that for colour negatives (and even some B+W negatives where the film base has a tint) you have to subtract the mask and expand the range.

Have a look at Darktable. Recent versions have improved a module which is intended specifically for this job (for both BW and color).

Hi there, nice project !

It would be great to establish some kind of collaboration with other DIY-digitizers projects:

https://hackaday.io/list/175104-diy-film-scanners

Hope that helps/inspires.

Your light source does not look that rich in spectrum, are you planning to change them? Taking pictures with a DSLR of pictures and slides/negatives is something I want to try someday, too - so I'm following this.

I agree, this light source is not very good, I used it just because I have it spare here.

But it provided a cold effect in the pictures that I liked.

In the future I want to put a better lamp and with intensity adjustment to improve the quality of photos.