4:3 letterboxed to 16:9 means you have black borders on top and bottom. Question is: why is your GH1 video 4:3 and not 16:9 already? Did you shoot in one of the non-HD formats? If so, your image quality is going to be relatively low (as seen on a cinema screen) than if you had shot it in Full HD. I would reformat your 4:3 movie to 16:9 by cropping the image and uprezzing to 720p. But if this process would adversely affect your film (as in important visual elements being cropped out) then I would request if they can screen it in the original 4:3 ratio.

Okay I see, so you're just going to conform your video to their requirement by making it wider with the pillars. Depending on the projectionist, they might just adjust the image so that the top and bottom touch the screen's edge (which is what you want). However, they also could try to fill the 16:9 screen completely by cropping and/or stretching your video (not what you want). Once again, I would clarify with the festival organizers if they're okay with screening it the way you plan. If it's ok'd, then I would make sure that the projectionist knows to project it with the pillar bars intact. Let them know that your movie is 4:3 (or the active area is 4:3 to be precise) all the way through.

In my brief time as a cinema projectionist, I never screened a movie that was exclusively 4:3. Hence, I would say that pillarbox presentations are a rarity. Well, letterbox in cinema is rare too (if the movie is formatted properly, that is. We use curtains to mask the image, not black bars). I would guess that they would not set their curtains to a 4:3 ratio (simply because it doesn't look very cinematic). Black pillar bars will never be as dark as a curtain, but I wouldn't worry about them being a distraction unless your movie has lots of dark scenes - that's when the pillars sometimes don't provide enough contrast to the actual image.

@rrsduncan Let me clarify that statement: a modern audience expects to see a wide screen at the movies. A 4:3 ratio nowadays might seem odd, outdated, or even intolerable to some moviegoers. It's because of this preference for widescreen that movie screens, HDTV's, and many computer monitors are as wide as they are. Of course, 4:3 Academy ratio is cinematic, technically speaking. But for the average moviegoer nowadays, it's that old square format that televisions and really old movies use to have. By modern moviegoing standards, it's not considered cinematic.

@AlbertZ the point is, understand that 2.39 is the only ratio with a different height. Resolution is remarkably unimportant (in terms of fitting the screen) only ratio is important. If they are playing it off a laptop and 720p projector (ugh but sounds like it) then you're fine, don't pad it at all, just conform to their standards and trust their scaler. 1.33 fits into all frames except scope and they'll know that, you're over thinking. Just leave it in its native resolution, its already correct so why change it?

@Htinla Blancanieves and The Artist might throw a spanner in those works of being intolerable, not to mention Projectionists 'screwing up' :p

Thanks guys! I will let know, indeed :) thanks for your great help, the next time I'll credit you in the end titles XD Here some further questions...

@htinla "We use curtains to mask the image, not black bars" So I understand that the pillarbox/lettering, when is made by a projectionist is a "physical process", not black digital bars but there is a physical curtain which "mask" the light

@htinla "Black pillar bars will never be as dark as a curtain, but I wouldn't worry about them being a distraction unless your movie has lots of dark scenes - that's when the pillars sometimes don't provide enough contrast to the actual image."

This can be a problem...unfortunately my short films are often full of dark scenes, I fear that the black pillarbox could show a sort of disturbing "flicker" effect too once projected (the files will be converted in MP4 H.264, which creates a sort of "media" in terms of luminosity...)

@rrsduncan "A proper D-Cine projector only does 1.85 and 2.39" These are bad times for Academy ratio shooters, guys, ahah! I love this format however, it let a different composition style..So I think I will send a Bluray or DCP copies in the future...

Only one question...DVD and Blurays are only PAL/25 fps, but DCP copies can be 30 fps,is it?

@rrsduncan "If they are playing it off a laptop and 720p projector (ugh but sounds like it) then you're fine, don't pad it at all, just conform to their standards and trust their scaler."

These are formats available in the multiplex where the short film will be projected:

<>

Pillars are used to make a format fit a screen that is wider than needed (like what you're doing). Letterbox is used to fit a format on a screen that is not as wide (i.e., 2.39:1 movie on a 16:9 screen). My comment about curtains needs more explaining: In a cinema, curtains are adjusted to make the screen's ratio match that of the movie. At home, because you're television is locked into 4:3 or 16:9, pillars and letterbox are necessary to show a movie in its intended ratio (as opposed to cropping or stretching the image to make it fit) - loosely speaking, they're like the curtains at a cinema. A movie shouldn't be letterboxed for theater exhibition, although a 4:3 movie like yours would need pillars (they're added electronically sometime in post-production, not by the projectionist). There's not much you can do about the pillars. Hopefully the projection is of good quality and keeps the pillars as black as possible throughout. Besides, if your movie is a good one, nobody will be paying attention to the pillars.

Hehe, all this talk has me really curious about your film...where can I see it?

@rrsduncan @rrsduncan Ok, the screening was perfect, thanks again for your help! (and a thanks to Personal view :) The black pillarbox was so dark that I can't even notice it.
Ps It was the only short movie shot on GHx body, and hacked 4:3 MJPEG ratio in 30Mbit/s (which is very low for us,Personal View-guys, but I haven't experienced bad quality in screening yesterday, instead I was surprised) . Most of the filmmakers have used a 5D (old hacking, not raw) but I was so disturbed by lot of shallow DOF everywhere, on the trees, on people, I feel so "myopic" XD The only drawback was 30fps: in silent shot the movements weren't dramatically soap-opera like, but the 30fps was more evident when sound is synchronous with an action (I thinks it should be a Gestalt-perception phenomena).