Brannan-Filter [Instagram] in Gimp 2.9
pixelmove.com
(The English instructions are included in the description.)
http://pixabay.com/de/frau-person-blumen-kr%C3%A4nze-garland-751236/
1. Open image and duplicate
2. Desaturate duplicate, set layer opacity to 37, mode to overlay
3. Select background layer, run Hue-Saturation: H=0, S= -30, L=0
4. Merge layers
5. Run Levels: Value= Input: 0/1.00/255
Output: 9/255
Red= Input: 0/1.00/228
Output: 23/255
Green= Input: 0/1.00/255
Output: 3/255
Blue= Input: 0/1.00/239
Output: 12/255
6. Brightness & Contrast: -10 Brightness/ +5 Contrast
7. Add a new layer
8. Fill new layer with #FFF8F2 and set mode to Multiply
9. Change to bottom layer
10. Run Levels again: Value= Input: 9/.91/255
Output: 7/255
Red= Input: 0/1.00/255
Output: 9/255
Green= Input: 0/1.00/224
Output: 3/255
Blue= Input: 0/.94/255
Output: 18/255
11. Brightness & Contrast: -4 Brightness/ -1 Contrast
12. Run Brightness & Contrast again: 0 Brightness/ +14 Contrast (I used -14 in this case)
13. Merge layers.