Filter to enhance the quality of image

[Stephen Liu]

(05-25-2022, 01:16 PM)rich2005 Wrote:

Quote:Tried again scanning film-negatives on smartphone running "Photo Negative Scanner" (software)
Smartphone - Samsung Galaxy S9+ (> 8 years) Macro Mode - 1.5

Following functions are provided on "Photo Negative Scanner"
1. Crop
2. Convert negative image to positive image
...snip....
Please advise which GIMP filter to be used to remove the green color?

How does (2) work ? Is that built into "Photo Negative Scanner"  If it is obviously does not work.

Going back to previous post for a colour negative the first process in Gimp is a White Balance then a Colour -> Invert is used for the positive.

The inevitable video https://youtu.be/VXZpzuUAvLQ almost 5 minutes this time (sorry) 





Some more advice on using BIMP (see earlier for a linux plugin) and adding a gmic-qt command.

Thousands to process   In my opinion asking too much for one set of commands to apply universally however, those three examples.

Hi,

Thanks for your advice and video.

Have tried;
1. Scanning negatives running Kodak software
2. RAW scanning

Too many settings.  It is not what I prefer.

My planning is;
1. No setting before and after scanning. Download the negative images on PC
2. Batch Post-editing - with 2/3 steps on GIMP (not too many adjusting).  If possible run command-line operation.

Tried again;
1. Scan negatives on smartphone without software
2. Download the negative images on Ubuntu 20.04 PC
3. Run "mogrify - rotate" to rotate the negative images
4. Open negative images on GIMP
-> Colors -> Auto -> White Balance
again;
-> Colors > Linear Invert
5. Export positive images

The result is not bad.  Please see attached photos

Comment and suggestions are welcome.  Thanks.

Regards