samedi 11 juillet 2009

GH1 Mud artefacts

Voici le plus gros problème du mode vidéo du GH1, la compression cracra pendant les mouvements rapides (et moins rapides) de la caméra/ Here is the biggest issue of the GH1 video mode, mud artefacts occurring in mid/fast pan camera movements.

Ce sont mes premières conclusions/ Those are my firsts conclusions.

Filmé avec un GH1 version PAL, 1280/720 50p, iso 100, tout en manuel, lentille Canon FD 50mm, focale variable / Shot with GH1 PAL model 1280/720 50p, iso 100, full manual, Canon FD 50 mm variable focal.

Images:




On voit clairement qu'utiliser un shutter lent (1/50 ici) minimise l'effet indésirable, il est toujours là mais caché dans le flou de mouvement. Plus le shutter est rapide, plus l'effet aura de chance d'apparaître, au delà de 1/50-1/60 ça devient un jeu de hasard :)

We see clearly that using a slow shutter speed (1/50 here) seems to make the issue disappear but it's still here, hidden in the motion blur. Using higher shutter speed than 1/50-1/60 will become a hazardous game :)

On peut comparer l'effet compression cracra aux étoiles:
On ne les voit pas en plein jour, juste certaines dès-fois mais elles sont toujours là, et bien c'est pareil pour la compression cracra, le shutter lent dans le rôle du jour et les shutters rapides dans celui de la nuit, dévoilant toutes les étoiles.

We can compare the mud artefact to stars: You can't see them at day, only a few sometimes but they're still here, that's the same for mud, slow shutter speed acting the day and high shutter speed acting the night revealing all stars.

Mais alors vient un probleme si l'on souhaite utiliser un shutter rapide dans un mouvement rapide de camera pour des raisons artistiques ou pour faire un beau ralenti en 50p... Et bien pour ma part ça sera assez difficile d'obtenir un résultat exploitable, la compression cracra venant tout gacher aléatoirement... J'utiliserais un shutter rapide pour des mouvements de cameras lents jusqu'à ce que Panasonic sorte une mise à jour du logiciel réglant ce problème (on peut toujours rêver:) ou que Red sorte sa Scarlet (on peut toujours rêver :( )

But what to do if we want to use a high shutter speed with a fast camera movement for artistic mind or nice slow motion in 50p?... For me it won't be easy to get a usable footage, the mud artefact killing the shot without knowing when before seing the clip in playback... I'll use a high speed shutter for sloooow or fixed camera until Panasonic make a firmware update (we still can dream:) or until Red release his Scarlet (We still can dream :( )

Pour d'informations veuillez visiter le forum DVXuser qui a un (trop) long post sur le sujet/ More informations on the (too) big post in DVXuser forum.

samedi 4 juillet 2009

Panasonic Lumix GH1 - Part 2

Back again for some slow motion and color correction tests.
All clips were shot with kit lens 14-140mm in 1280/720 at 50p, manual focus,
Contrast -2
Sharpness -2
Saturation +1
Noise reduction -2

Scaling 50p to 25p is easy, no dropped/duplicated frames, nothing more to say, it works prefectly.

Color correction: adding contrast, playing with colors should not be pushed too far, but it's still good at "normal" color correction.

In the following clips I adjusted contrast, saturation and color balance, added motion blur in the car clip.

Lumix GH1 slow motion + color correction from 1k0 on Vimeo.



Lumix GH1 Color correction from 1k0 on Vimeo.

vendredi 3 juillet 2009

Panasonic Lumix GH1 - Part 1


F5.3 1600 - iso 100


14mm F4.0 400 - iso 100


14mm F4.0 40 - iso 640


14mm F4.0 20 - iso 100


25mm F5.8 4 - iso 100


18mm F5.0 15 - iso 100


25mm F5.8 40 - iso 100

14mm F4.0 6 - iso 100


14mm F4.0 30" - iso 100


14mm F4.0 60" - iso 100

Well I was able to take good pictures with this GH1 and the kit lens 14-140mm.
One thing I don't like is the digital grain you can see in the night pictures.
All pictures (resized) are rough from the GH1 except the clouds where contrast was adjusted by curves in Photoshop.
I really love the possibility to choose between different shooting format: 4:3, 3:2, 16:9 and 1:1, the focus assist in manual mode, choosing OUR white balance, MEGA O.I.S. stabilizer, articulated LCD... I love it :D
I'm waiting for my Canon FD adapter to have a little more fun :)

Now, how the GH1 can handle visual effects? Here are 2 quick shaky matchmoving tests:

Lumix GH1 3D matchmoving test from 1k0 on Vimeo.



Lumix GH1 Matchmoving test 02 from 1k0 on Vimeo.



Shot at 14mm, 1280/720 50p AVCHD full manual.

Process:

1/ Edited the AVCHD in Sony Vegas pro 8c, exported it to jpeg sequence,
2/ Imported the Jpeg sequence in Matchmover pro 4, tracked the shot, (hard tracks placed manually + automatic tracking to add a few more tracks), solved for camera and exported it as maxscript,
3/ Imported Maxscript in 3dsmax 9, created a simple scene, built ground (for shadows) from tracking data, rendered as TGA sequence,
4/ Composited the original shot with the TGA sequence from 3ds max 9 in After effects 6.5 and that's it.

The result is quite good, even with little jello resulting from rolling shutter.
With stable footage, glide cam, steadycam it will be nicer :)

jeudi 11 juin 2009

Versus II Update

List came down to 2o8 shots :)


Still mocap, key framing adjustment to do.
Here is a little preview of Movimento maxscript applied to my rig in 3dsmax :

3dsmax - Movimento mocap Slow motion from 1k0 on Vimeo.

dimanche 7 juin 2009

PT - Rei Ayanami 3

At last, 3D model completely achieved :) It's not perfect but I still can see it looks like the original model.



As you can see, most of the details have been done in displacement mapping, to make a lighter mesh and simple clean topology.

To help me drawing my displacement textures, I made splines on the model and use "render to texture" to edit them in photoshop:

(For the first time I was able to made a nice clean pelt mapping in the unwrap process :)

For lighting it's a classical 3 point light set-up, 3 area lights/raytraced shadows and a sky light for the low ambiance.

Compositing in After Effects: a bit of desaturation, curves, little depth of field, add a white glow, chromatic aberration , grain, typo.

lundi 1 juin 2009

PT - Rei Ayanami 2

3D model achieved! Unwrapping done, displacement/normal/bump maps done, next week end will come complete textures and final images ;)

dimanche 24 mai 2009

PT - Rei Ayanami

Here is a preview of my last personal modeling training in 3dsmax, the Rei Ayanami revoltech toy.
Missing parts : Hands, left side hair. Unwrapping, texturing, more next weekend ;)

mardi 19 mai 2009

Versus II - Naya trailer on youtube

Hi, having problems uploading the Naya trailer on vimeo, so here is the youtube version from the director Nicolas Santini.
Enjoy in HQ :)

vendredi 8 mai 2009

Versus II website

Here it comes, in a few hours :)

The Naya trailer will be available at the same time in high quality.

lundi 27 avril 2009

Personal training (Fake)

Fake because it's a old model (bad skinning) and taken from Versus II ;)
Still getting issues with depth of field in after effects.