On Nov 2, 2010, at 7:45 PM, Jonas Lopez wrote:
Need help understanding webcam differences
Picture this on your G4, the webcam local picture is just not clear
- reason is 400k vs 4M pixels. A 640x480 pixel image printed at a
size of 6.4 x 4.8 inches has a printing resolution of 100 PPI, just
look at several public webcam sites to see which cams produce very
clear, brilliant color, well lit images, but then here is my question.
I've always heard that the rule of thumb for a digital photo to be
printed so that it looks good at normal viewing distances (held in
hand) is 200 ppi (pixels per inch), so this means a 640x480 pixel
image would print as a 3.2 x 2.4 photo, and with your 100 ppi
you'd have some degradation from photographic quality, but it would
still probably look ok.
The kids wave to us, their hands moving rapidly in the wave, but all
we see is a blur or with some cameras, the wave area pixelates, but
the remainder of the pix is clear. What is the cause of this?
This is caused by the frame rate, how often each individual image can
change per second. Many older cameras can only produce 5, 10, or 15
fps (frames per second) and most video is at least 24 or 30 fps to
look totally smooth. If your G4 is USB 1.1 (the standard USB for all
G4 Macs), you'll need to get a USB 2.0 PCI card to get better frame
rates from your USB webcams. Some USB webcams are not capable of
higher frame rates, so make sure yours is capable of 24 fps if you
want smooth video. If you want to stream this over the internet,
you'll need a fast enough internet connection also, you won't be able
to do this on dial-up or a slow connection.
Can the Apple tablet or phone camera appear on my G4 and will it be
any better?
I don't know? I haven't heard that there's a way to activate the
camera on an iPhone or iPad to be used as a webcam for another
computer? It may be possible, but seems like a bad solution to me.
Determined to have good webcam on my G4, but locked out by
Apple application that refuses to let me use my cameras.
There are solutions for this problem. What OS version and which
applications? (I'm guessing 10.4.11 and iChatAV? perhaps?) Here's a
solution:
http://hints.macworld.com/article.php?story=20030711094946105
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