X-Don
Imported Account
Nov 10, 2000, 1:04 PM
Post #3 of 3
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Re: Does anyone know the exact technical differences between "Normal" and "Frame" modes?
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: I know that "Normal" means interlaced and "Frame" means progressive scan, but does anyone have any additional info on:
: Frame rates? It's 29.97 frames/sec for "Normal", but what about "Frame"?
With the GL1/XL1 FRAME mode means that every 1/30 of a second the image is sampled (at the selected shutter speed) and two fields are formed from that sample. Canon uses a vertical pixel shift method; i.e., they sample the G pixels from the even lines and the RB from the odd lines and then use some fancy DSP to form the two fields of the frame. The reuslt is better than the simple field doubling used by most consumer/prosumer camcorders, but not quite up to what you would get from a true progressive scan where in RBG is obtained from all lines.
: Resolution?
Vertical resolution is probably around 360 lines, in contrast to field doubling which would max out at about 240 lines, and true progressive which would yield about 480 lines. 360 is a number that corresponds closely to the nominal horizontal resolution of a broadcast NTSC signal.
Many folks feel that frame mode gives more of a film-like feel to the image, and youwill see motion artifacts similar to film when using frame mode; e.g., pans and fast moting objects will tend to have a strobbed look to the motion. Thus when shooting in frame mode you have to pay attention to movement effects.
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