Brent's DropLit Projector Calibration

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brent
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Brent's DropLit Projector Calibration

Postby brent » Fri Aug 15, 2014 9:31 pm

This is a simple calibration method I devised for the DropLit's projector. It is an active calibration, meaning you have to match objects/shapes/text up for an accurate calibration.


Both of the calibration images are 3"x3"x3", fitting the vats of the DropLits. The images are identical except for the black/blue colorings.


Image
*Print out the image above. You can print it to paper or cardstock, just make sure you are printing to the accurate dimensions of the picture (3"^3).

Image
*Save the image above to your computer

*Take the printed image and put it underneath your vat's surface. You will want to ensure the picture is square with the frame of the droplit.

*Turn on your projector and project the second image (blue) onto the 'vat'

Image
*You will want to match the black squares/text/markings on your 'calibration card' with the blue squares/text/markings being projected. The GIF above depicts an accurate, active calibration.

Once you are matched up, you are finished calibrating.


Circle versions are below. The circle is 3" round. Same method applies as the images are identical for color-matching

Projector Image:
Image

Paper Image:
Image

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Re: Brent's DropLit Projector Calibration

Postby geneb » Sat Aug 16, 2014 11:32 am

The vat is round. :)

g.
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brent
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Re: Brent's DropLit Projector Calibration

Postby brent » Sat Aug 16, 2014 1:58 pm

geneb wrote:The vat is round. :)

g.


This goes underneath the Vat. I see your concern and I'll edit the PSD to a round shape for people who want to put it inside the vat, or have the shapes match up.

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Re: Brent's DropLit Projector Calibration

Postby DavidF » Sat Aug 16, 2014 1:59 pm

I still say sick one of those sharks with frikin lasers on thier heads to one of the vats and use that for calibration. It would be the coolest acessory there is!
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Re: Brent's DropLit Projector Calibration

Postby brent » Sat Aug 16, 2014 2:05 pm

Circle versions are below. The circle is 3" round. Same method applies as the images are identical for color-matching

Projector Image:
Image

Paper Image:
Image

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Re: Brent's DropLit Projector Calibration

Postby JohnStack » Mon Aug 18, 2014 3:46 pm

When you say calibration, do you mean Focus?
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Re: Brent's DropLit Projector Calibration

Postby Polygonhell » Mon Aug 18, 2014 5:19 pm

JohnStack wrote:When you say calibration, do you mean Focus?


In addition to focus you need some way to position/adjust the projector, so that the image is aligned correctly (no keystoning) and you know how the resolution corresponds to the size of the object (pixels per inch).

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Re: Brent's DropLit Projector Calibration

Postby rgthane » Fri Aug 22, 2014 1:05 pm

Brent,

I just created a pdf set of test 9 patterns that are 3" x 3".
I don't have a projector yet, but I felt these might be useful for both setting the Zoom while open and setting the focus on the printer.

As long as the PDF's aren't rescaled (ie "fit the page"), any of them should work.

Hope this helps the group.

Robin
Attachments
DropLit Focus Test Patterns 1-9.pdf
(810.3 KiB) Downloaded 80 times

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brent
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Re: Brent's DropLit Projector Calibration

Postby brent » Fri Aug 22, 2014 10:27 pm

rgthane wrote:Brent,

I just created a pdf set of test 9 patterns that are 3" x 3".
I don't have a projector yet, but I felt these might be useful for both setting the Zoom while open and setting the focus on the printer.

As long as the PDF's aren't rescaled (ie "fit the page"), any of them should work.

Hope this helps the group.

Robin


Looks good to me!


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