All posts by kewl

Cycling, Europe, France, Germany

Cycling from Strasbourg to Offenburg

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On cycleways, mostly dedicated. Easy to ride, the total distance is about 60 km long on a flat surface, mostly on asphalt; only one small segment is on a track and another one on gravel. The North segment to Offenburg is nicer than the South back to Strasbourg via Illkirch.

Download GPX file.

Elevation map
Link on GPSies.

Europe, France, Hiking

Circular hike Château de Hunebourg

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Located between Neuviller-lès-Saverne and La Petite-Pierre, in Alsace, France, the hike may be started (and stopped) at Château de Hunebourg and a drink (and/or a meal) enjoyed.

As you may have seen (where the blue junk is), we lost track of the track at some point but it wasn’t hard to find it back. The walk is enjoyable and its distance is about 5.5 km. Download the GPX file.

Elevation map:
Elevation
Link to GPSies.

IT, Photography

enfuse examples

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Last month, I took a time lapse session of New York skyline during dusk. I wanted to merge them and turned to Enfuse. As I didn’t find too many examples I wrote a small script to generate some series of images out of a sample of the time lapse pictures. The result is quite amazing and looks promising. Below is the average image of 201 photos taken during 40 minutes.

all-default

The shell script can be downloaded here (attention! it’s not idiot proof 😉 ). Just copy your image files to a directory with the script and check it out. It runs on both Linux and Mac systems and requires to have Enfuse installed and the command enfuse in the system path.

Note that each picture can be opened in full size, using Open Image in New Tab. For the tests, I have reduced the number of images to 10 of them during the twilight.

Rendered gray projectors

Various gray-projectors in soft-mask, using --gray-projector=value, where value is below:

average normal-average
lightness normal-lightness
l-star normal-l-star
luminance normal-luminance
pl-star normal-pl-star
value normal-value

The difference is not obvious; however if we enable the flag --hard-mask, then the difference becomes evident:

average hardmask-average
lightness hardmask-lightness
l-star hardmask-l-star
luminance hardmask-luminance
pl-star hardmask-pl-star
value hardmask-value

Sigma and Mu variation

The following images have been rendered using the average gray projector.

Sigma

value soft-mask hard-mask
0.00 soft mask sigma0.00 hard mask sigma0.00
0.10 soft mask sigma0.10 hard mask sigma0.10
0.20 soft mask sigma0.20 hard mask sigma0.20
0.30 soft mask sigma0.30 hard mask sigma0.30
0.40 soft mask sigma0.40 hard mask sigma0.40
0.50 soft mask sigma0.50 hard mask sigma0.50
0.60 soft mask sigma0.60 hard mask sigma0.60
0.70 soft mask sigma0.70 hard mask sigma0.70
0.80 soft mask sigma0.80 hard mask sigma0.80
0.90 soft mask sigma0.90 hard mask sigma0.90
1.00 soft mask sigma1.00 hard mask sigma1.00

Mu

value soft-mask hard-mask
0.00 soft mask mu0.00 hard mask mu0.00
0.10 soft mask mu0.10 hard mask mu0.10
0.20 soft mask mu0.20 hard mask mu0.20
0.30 soft mask mu0.30 hard mask mu0.30
0.40 soft mask mu0.40 hard mask mu0.40
0.50 soft mask mu0.50 hard mask mu0.50
0.60 soft mask mu0.60 hard mask mu0.60
0.70 soft mask mu0.70 hard mask mu0.70
0.80 soft mask mu0.80 hard mask mu0.80
0.90 soft mask mu0.90 hard mask mu0.90
1.00 soft mask mu1.00 hard mask mu1.00

Mu and Sigma matrix

Only using the hard mask rendering where Mu values are horizontal and Sigma vertical:

  0.00 0.25 0.50 0.75 1.00
0.00 hard mask mu 0, sigma 0 hard mask mu 25, sigma 0 hard mask mu 50, sigma 0 hard mask mu 75, sigma 0 hard mask mu 100, sigma 0
0.25 hard mask mu 0, sigma 25 hard mask mu 25, sigma 25 hard mask mu 50, sigma 25 hard mask mu 75, sigma 25 hard mask mu 100, sigma 25
0.50 hard mask mu 0, sigma 50 hard mask mu 25, sigma 50 hard mask mu 50, sigma 50 hard mask mu 75, sigma 50 hard mask mu 100, sigma 50
0.75 hard mask mu 0, sigma 75 hard mask mu 25, sigma 75 hard mask mu 50, sigma 75 hard mask mu 75, sigma 75 hard mask mu 100, sigma 75
1.00 hard mask mu 0, sigma 100 hard mask mu 25, sigma 100 hard mask mu 50, sigma 100 hard mask mu 75, sigma 100 hard mask mu 100, sigma 100

Looks like the fun has just begun 🙂