On Wed, 2008-04-09 at 13:43 +0300, Petri Helin wrote:> On Wed, Apr 9, 2008 at 9:43 AM, Jouni Karvo <Jouni.Karvo@xxxxxx> wrote:> > > Nevertheless, although probably most techies feel the crop mode is not> > interesting, perhaps you'll be able to find one that is willing to> > implement it - or perhaps you can DIY and share the code.> >> > I think the idea of cropping material from aspect ratios 16:9 or> 2.39:1 to 4:3 is not worth putting attention, because it will often> result in quite awkward image. When done properly with technique> called pan&scan (http://en.wikipedia.org/wiki/Pan_and_scan) where the> cropped selection can reside at any part of the original image, the> result is bearable. But think about a movie shot and broadcasted in> 2.39 and crudely cropped so that the 4:3 part in the middle is> shown... You will see half heads, people talking to people not> included in the picture and so on. Or think about a football match in> 16:9 cropped to 4:3... with the ball in the portion left out. However, often things just work out: the camera operators are sometimesdirected to shoot the full 16:9 frame but keep the action in a 4:3frame. This does happen, and IMHO makes for shots that seem too wide ona 16:9 screen. Production companies do this to maximise the marketpotential for their material. To use the football case: theinternational feeds still need to deliver 4:3 images. So the hostbroadcaster who wants both a 16:9 version and a 4:3 version can eitheremploy twice as many camera operators and have twice as many cameras etcetc OR shoot 16:9 but keep the action in the 4:3 frame. Then there is 14:9 material. This is shown on a 4:3 image with smallerblack bars, or cropped less (than 16:9) and shown full screen on a 4:3. (I myself prefer the black bars on top and on bottom and view all 16:9programmes that way on my 4:3 set) (For movies the transfer to video can take more time: there pan&scan isused, but so are other techniques including letterbox, image distortionetc. It is particularly noticeable at the end of a movie with creditsthat use the whole 16:9 width) > > -Petri> > _______________________________________________> vdr mailing list> vdr@xxxxxxxxxxx> http://www.linuxtv.org/cgi-bin/mailman/listinfo/vdr> _______________________________________________vdr mailing listvdr@xxxxxxxxxxxxxxx://www.linuxtv.org/cgi-bin/mailman/listinfo/vdr
