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Author   Topic : "Graphics tablet pet peeve..."
GreenPeach
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PostPosted: Wed Feb 21, 2001 11:24 am     Reply with quote
Why, why, why is it that when drawing curved lines, in Photoshop 5.5, in a rapid motion, that I get a series of straight lines instead of a truely curved line? If I slow down my movement a tad it works fine. I've got a 850meg CPU, 128 Ram and a huge hard drive. Is it my cheep tablet? Are there some settings I can change in Photoshop to get better performance? Does this happpen to you? It makes me sad, it really does.
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waylon
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Joined: 05 Jul 2000
Posts: 762
Location: Milwaukee, WI US

PostPosted: Wed Feb 21, 2001 3:22 pm     Reply with quote
As far as I've seen, that's "just the way it works". The tablet only sends information to your computer at limited intervals (depending on whether it's serial, usb, etc.) The less frequently it updates, the choppier the lines. But even with the best hardware, you're still going to get some choppiness if you go too fast.

Some programs interpolate the positions that the tablet sends it, and you get really nice curves as a result. Unfortunately, Photoshop doesn't do this.
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Wiked Ewok
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Joined: 19 Aug 2000
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Location: San Francisco, CA USA

PostPosted: Wed Feb 21, 2001 5:26 pm     Reply with quote
The Tablet sends the Data in packets at some rate per second. It works this way with All devices connected to the computer. Try drawing with the mouse, move it in circles rapidly and you'll see that you're going to get the same effect. It is true, however, that the better the graphics tablets probably have higher transmitting rates. What type and what size is your tablet? I Just got one, a wacom, they said its going to take 30 days to arrive(it took them 10 days to recieve my check they said, 10 more days to get it from the warehouse, 10 days to arrive...I say they're damn lazy asses...) but i guess the 70dollar price drop was worth it(mysimon.com a while ago).
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burn0ut
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Joined: 18 Apr 2000
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PostPosted: Wed Feb 21, 2001 6:02 pm     Reply with quote
it has nothin to do with your comp its alll photoshop
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GreenPeach
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PostPosted: Wed Feb 21, 2001 6:18 pm     Reply with quote
I've got the popular option, casual user price point model, the Graphire. (In tangerine color) I spent a long time trying to figure out if it was worth it to buy one of the pro models, but I couldn't find answers so I went cheap. It's kinda disapointing to hear that its the nature of the beast but I'm glad I didn't make a huge mistake in getting a cheaper tablet. If I ever make a dime from this "hobby" I'll get a nice one.
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ghi
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Joined: 03 Feb 2001
Posts: 12
Location: vancouver,bc,canada

PostPosted: Wed Feb 21, 2001 7:29 pm     Reply with quote
all wacoms are of the same performance quality. graphires possess only half the pressure sensitivity as intuos'. but all the drivers are the same. i just did a tracking test on photoshop and drew a circle very quickly and generated a polygon! and froze my mac!? did the same test with painter 6 with the 2B pencil tool and got great results. smooth and fast.
appears to be photoshop.

ghi
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TheNexx
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Joined: 22 Dec 2000
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Location: Lompoc,CA,US

PostPosted: Wed Feb 21, 2001 10:02 pm     Reply with quote
Did you ever tried to decrease Spacing percent of your brush?

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Dennis Sedov
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CrashWick
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Joined: 22 Feb 2001
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PostPosted: Thu Feb 22, 2001 4:26 am     Reply with quote
First of all... I don't think there is anything wrong with your tablet.
The fact that you get choppy lines has to do with the fact that your computer receives data from your tablet only a couple of times a second (i dunno exactly.. but should be around 30 times a sec)... So photoshop receives the position of your pen on the tablet 30 times a sec. To make all these points into a line it plays "connect the dots". In other words.. it draws a straight line (linear interpolation) between the point it just received and the previous point it received. Painter does this better.. instead of linear interpolation between points (straight lines) it uses another interpolation method (blinear? I dunno actually) which takes more points into account than just the last two points.
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