Help with tuning scanners

[Fripz]

Hi all.
I need our help and knowledge.
I've been trying to tune my LaserPhoto LP20 scanners, and the result is making me scratch my head.
I followed Adam Burns guide, and the result comes here :-)

Please ignore the blanking issue in the first three pictures, it's a result from Spaghetti software.
I've tuned them at 8° and 20K

Any suggestions?

Startup with cold scanners:


Scanners run for 5 minutes:


Lasermedia:


ILDA frame from HE Laserscan:


TIA
Fredric

[buffo]

Hello Fredrick!

You tuning looks pretty close. Your blanking shift setting is off (as shown by the lines at the top of the test pattern), but otherwise the scanners look pretty good - once they warm up anyway. Is there a specific problem that you have with the image, or are you just trying to get them as close to perfect as possible?

I suggest you use HE Laserscan for your fine adjustment, as it appears that Spaghetti is introducing more artifacts into the pattern. (I had the same problem when I ran Spaghetti on my projector, for what it's worth.)

It's strange that your scanners have to "warm up" before the tuning is correct. Do they run hot? (Do you have a fan inside your projector to prevent excessive heat build-up?) Also, you didn't mention which scanners you are using... That would be helpful information.

From the pictures you posted, it appears that you might have just a tiny bit too much servo gain. The bottom picture appears to show the circle stretching slightly beyond the center square in both the x and y axis. But it's hard to tell with such a small picture.

If these are 20K scanners, then I'd say that you've got them tuned fairly well already. If you want to try to get them dialed in even tighter, then please post a larger picture (1024 x 768 resolution) of the ILDA test pattern with the blanking turned off. (That is, I want to see both the pattern and all the normally blanked retrace lines.) Also, please post a larger picture of the lasermedia test pattern.

Adam

PS: That's my tutorial you're using. Glad you found it useful!

[Fripz]

Thanks Adam for the fast reply.

The scanners are Laserphoto LP20 http://www.laserphoto.org/en/ProductView.asp?id=41&act=

They don't get to hot, i think. just varm

There is a difference between the second and fourth picture.
In the second picture the circle is ok, but in the fourth picture it look a little off centre.

I want to get the so close to "perfect" i can get.
Is it possible to get the lasermedia image better with these scanners?
I think the corners are a little bit rounded.

[buffo]

Hi Fredrick;

Well, looking at the website for those scanners, they appear to be very similar to the ScanEco-20's that LaserShowParts.com used to sell. And if that's the case, then you've probably already got them tuned up as good as they'll get.

However, if you want to continue tuning, I suggest you use the HE Laserscan software and run through the tuning process once more. This time you don't need to go "all the way down the stairs". Just back them off until the circle is about 70% of it's current size and then start bringing them back up.

The corners of the laser media pattern should be nice and sharp. I'm not really sure why they look so rounded in your picture. The corners on the center square of the ILDA test pattern look nice and sharp, so I'm wondering why the lasermedia pattern doesn't look the same. (Unless you have a different pattern, that is...)

Adam

[Fripz]

I just downloaded the testpattens from the ftp. and i will try them later today in the HE Laserscan software. I will also upload pictures with no blanking.

Here is a bigger picture of lasermedia image:

[mixedgas]

[QUOTE=Fripz;99330]I just downloaded the testpattens from the ftp. and i will try them later today in the HE Laserscan software. I will also upload pictures with no blanking.

Here is a bigger picture of lasermedia image:


The slightly fatten diagonal lines on the laser media indicate that your x and y velocity almost but do not match, but for a pair of 20Ks, what you are showing so far looks pretty good. I'd do as Buffo says, back off a little and then repeak. But very nice so far.

Steve

[allthatwhichis]

Like buffo said, that blanking offset is off also by how far the "missing" part of the bottom left "triangle". It should be much farther down.

[Fripz]

Thanks guys.

I just tried with the test patterns from the ftpserver.
Here is the results:

ILDA 12K Spaghetti



Lasermedia Spaghetti:


Quadrature Spaghetti:


Orientation Spaghetti:


And finally ILDA 12 with HE Laserscan (20k PPS) :


I don't understand why the Laserscan software is so different.


Bonuspictures :




Any suggestions about software and tuning??
// Fredric

[DZ]

Looking at the ilda test pattern, is that with both spaghetti and laserscan set to output at 20K? If that's the case, then one or both don't actually output 20K when they should be outputting 20K. The best way to know for sure is to run the scanners on a QM2K or FB3 set for 20K to see which program is running closest to 20K. Without a QM2K or FB3, it's a guessing game.

Also, are you able to adjust blanking shift in spaghetti?

[allthatwhichis]

That looks very good; test frames and projector build. All you need to do is figure out how to change your blanking offset and it will all look right. I just don't know how to do that in Spagetti...