#URGENT HELP w. 24Hours
7 messages in this thread
I have a problem with my PAR, I need to do the follwing:
I have to put a simplified architectural plan onto Betacam SP for Television.
The image is a PAR still, image.
I get a lot of flicker on the Horizontal Lines, which bothers me and might not
suffice for me to get the job to produce 20 more of those still plans for TV
series on housing.
I tried thickening Lines, changing some colors but still I get Flickering,
color changes helped a bit, but what is the best way to get such a 2D Line
Drawing with filled surfaces to BetacamSP, with nearly no Flicker.
I only have a Targa+32 and a PAR to do it, and both seem to have the same
problem???? BTW I am in the PAL world meaning 25 Frames/sec.
Any advice Welcome as soon as you can
Christophe Van Oyen
Don't worry, you are not having this problem due to being in the PAL format.
Your problem stems from the interlaced scanned TV that is displaying the hard
edged horizontal lines in your graphics. When the very edge of the horizontal
line goes from a dark (usually black) line to the light (usually white
background) the edge of this line can't decide whether to jump to the odd or
even field. To prove this to yourself just select the odd or even field
display with your PAR output. This in itself may be the solution you need to
display your stills, ie. use field odd or even display rather than frame
display. If this doesn't work, I have had some success using blur in photoshop
to create a gradient edge to horizontal lines in a sharp graphic such as those
created with corel draw. This will degrade the sharpness of the image but it
may be necessary to get around the old plucked guitar string look to those
lines. Just remember it is usually not the thickness of those lines but the
sharpness of the edge of the line and it's placement in reference to the
location of the odd or even field scan line that causes this problem.
Ok, I'll give it a try, hope it works out alright, so I'll do a Photoshop Blur,
or try using just one field.
Christophe
Christophe,
In addition to the great reply from Don, you might want to experiment with
3D Studios own VBLUR IPAS.
There is little documented about it and is often forgetten about. Start your
experimenting with about 1/2 of it's default setting. VBLUR averages 3 scan
lines at a time to help deal with NTSC interlace flicker. Note that it also
softens the image so keep it as low as you can get away with.
Good Luck,
Ralph
>> VBLUR IPAS. <<
Warning: The VBLUR documentation advises against blurring field rendered
images. Since it averages lines vertically, you would inadvertantly blur
between even and odd fields. Use VBLUR only on frame rendered images.
– Dave
>> The VBLUR documentation advises against blurring field rendered images.
Good to keep in mind. Thanks for bringing that up, David.
Last time VBLUR came in handy was on a video project for Kenworth Trucking
Co. I had to use a scan from their technical type brochure (lots of thin
dark horizontal lines) on a 2D card in a field rendered animation. It
flickered badly. So, I just rendered the scan as a background with slight
VBLUR and saved that image to be used as the texture map. No more flicker.
Good to know this little IPAS… it's strength and it weakness.
Ralph
try a one to one blur, i use dgs3.3 video utilities for this. only thing worth
a shit in the package. what it does is blur one pixel to the right and one
pixel down, gets rid of all the flicker. maybe there is something out there
that does the same thing. or i can send you the utility. since dgs is belly up
anyway.
sherwood animations