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uk.tech.digital-tv (Digital TV - General) (uk.tech.digital-tv) Discussion of all matters technical in origin related to the reception of digital television transmissions, be they via satellite, terrestrial or cable. Advertising is forbidden, with no exceptions.

projecting an image



 
 
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  #1  
Old April 3rd 15, 05:25 PM posted to uk.d-i-y,uk.tech.digital-tv
Bill Wright[_2_]
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Posts: 9,381
Default projecting an image

I need to project or otherwise place an image on a wooden board so I can
paint it on the board by using it as a guide. I don't have an overhead
projector. I have some transparent media for a laser printer and I have
a 60 year old 6cm projector in the loft but I don't want to dig it out
and the bulb will blow and the whole thing will be annoying.

Isn't there some way the old painter guys used to do this, just with a
mirror or something?

Come on gentlemen and ladies, ideas?

Bill
  #2  
Old April 3rd 15, 05:30 PM posted to uk.d-i-y,uk.tech.digital-tv
Andrew Mawson
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Posts: 5
Default projecting an image

"Bill Wright" wrote in message ...

I need to project or otherwise place an image on a wooden board so I can
paint it on the board by using it as a guide. I don't have an overhead
projector. I have some transparent media for a laser printer and I have
a 60 year old 6cm projector in the loft but I don't want to dig it out
and the bulb will blow and the whole thing will be annoying.

Isn't there some way the old painter guys used to do this, just with a
mirror or something?

Come on gentlemen and ladies, ideas?

Bill

Google 'camera obscura'

http://en.wikipedia.org/wiki/Camera_obscura

Andrew
  #3  
Old April 3rd 15, 05:41 PM posted to uk.d-i-y,uk.tech.digital-tv
Tim+[_2_]
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Posts: 83
Default projecting an image

Bill Wright wrote:
I need to project or otherwise place an image on a wooden board so I can
paint it on the board by using it as a guide. I don't have an overhead
projector. I have some transparent media for a laser printer and I have a
60 year old 6cm projector in the loft but I don't want to dig it out and
the bulb will blow and the whole thing will be annoying.

Isn't there some way the old painter guys used to do this, just with a mirror or something?

Come on gentlemen and ladies, ideas?

Bill


See if you can find an old epidiascope.
http://en.m.wikipedia.org/wiki/Epidiascope. It can project an image of an
opaque image (like a page of a book or a drawing on paper).

Used to be a lovely old one in my old anatomy lecture theatre.

Tim
  #4  
Old April 3rd 15, 05:44 PM posted to uk.d-i-y,uk.tech.digital-tv
Tim+[_2_]
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Posts: 83
Default projecting an image

Bill Wright wrote:
I need to project or otherwise place an image on a wooden board so I can
paint it on the board by using it as a guide. I don't have an overhead
projector. I have some transparent media for a laser printer and I have a
60 year old 6cm projector in the loft but I don't want to dig it out and
the bulb will blow and the whole thing will be annoying.

Isn't there some way the old painter guys used to do this, just with a mirror or something?

Come on gentlemen and ladies, ideas?

Bill


Here you go. ;-)

http://pages.ebay.com/link/?nav=item...d=251893650350

They're very simple "machines". Would make a good DIY project.

Tim

Tim
  #5  
Old April 3rd 15, 05:57 PM posted to uk.d-i-y,uk.tech.digital-tv
Bill Wright[_2_]
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Posts: 9,381
Default projecting an image

Andrew Mawson wrote:

Google 'camera obscura'


The problem is finding a lens of suitable focal length. This isn't the
method I'm half remembering anyway.

Bill
  #6  
Old April 3rd 15, 05:58 PM posted to uk.d-i-y,uk.tech.digital-tv
michael adams[_4_]
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Posts: 12
Default projecting an image


"Bill Wright" wrote in message ...
I need to project or otherwise place an image on a wooden board so I can paint it on the
board by using it as a guide. I don't have an overhead projector. I have some
transparent media for a laser printer and I have a 60 year old 6cm projector in the loft
but I don't want to dig it out and the bulb will blow and the whole thing will be
annoying.

Isn't there some way the old painter guys used to do this, just with a mirror or
something?

Come on gentlemen and ladies, ideas?

Bill


You don't say what the relative sizes are, but you could scale
up the image using grids. Draw a grid on the image and a
proportionally larger grid on the board which will show you
where the outlines cross so as to keep it on proportion

or lash up a pantograph

http://en.wikipedia.org/wiki/Pantograph

using some pieces of timber. Which just needs a two pencil
sized holes - one to trace and one to draw, and holes drilled
to take the pivots where the arms cross.

michael adams

....





  #7  
Old April 3rd 15, 06:21 PM posted to uk.d-i-y,uk.tech.digital-tv
Roger Mills[_2_]
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Posts: 269
Default projecting an image

On 03/04/2015 18:25, Bill Wright wrote:
I need to project or otherwise place an image on a wooden board so I can
paint it on the board by using it as a guide. I don't have an overhead
projector. I have some transparent media for a laser printer and I have
a 60 year old 6cm projector in the loft but I don't want to dig it out
and the bulb will blow and the whole thing will be annoying.

Isn't there some way the old painter guys used to do this, just with a
mirror or something?

Come on gentlemen and ladies, ideas?

Bill


Do you know anyone who would lend you the sort of projector that plugs
into a computer? If so, you could take a digital photo of the image and
then project it from a laptop.
--
Cheers,
Roger
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  #8  
Old April 3rd 15, 06:54 PM posted to uk.d-i-y,uk.tech.digital-tv
michael adams[_4_]
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Posts: 12
Default projecting an image


"Roger Mills" wrote in message
...
On 03/04/2015 18:25, Bill Wright wrote:
I need to project or otherwise place an image on a wooden board so I can
paint it on the board by using it as a guide. I don't have an overhead
projector. I have some transparent media for a laser printer and I have
a 60 year old 6cm projector in the loft but I don't want to dig it out
and the bulb will blow and the whole thing will be annoying.

Isn't there some way the old painter guys used to do this, just with a
mirror or something?

Come on gentlemen and ladies, ideas?

Bill


Do you know anyone who would lend you the sort of projector that plugs into a computer?
If so, you could take a digital photo of the image and then project it from a laptop.


On second thoughts...

If possible scan the image

Load it into a DTP or Paint program

Blow it up to the require final size. Or even bigger

Trace around any lines you need as a guide, with a thick black line.

Flood fill the rest with white so as not to waste ink.

If the program has a "poster" printing option, use that.

Otherwise break it into panes manually and print it onto bank
paper. The problem with the transparent medium may be that that is
too thick to press the impression.

Print all the panels out and join them together. Turn it over and trace
over the lines with an B6 or chinagraph pencil. Offer that up to
the board and go over the lines again presing hard same as with old
fashioned tracing.


michael adams

....



  #9  
Old April 3rd 15, 06:55 PM posted to uk.d-i-y,uk.tech.digital-tv
Norman Wells[_6_]
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Posts: 937
Default projecting an image

"Bill Wright" wrote in message
...
I need to project or otherwise place an image on a wooden board so I can paint
it on the board by using it as a guide. I don't have an overhead projector. I
have some transparent media for a laser printer and I have a 60 year old 6cm
projector in the loft but I don't want to dig it out and the bulb will blow and
the whole thing will be annoying.

Isn't there some way the old painter guys used to do this, just with a mirror
or something?

Come on gentlemen and ladies, ideas?


You need a lens from an old 35mm single lens reflex camera. Mount it, eg in a
hole through another board, so you can securely position it where necessary
between the well-illuminated original and the target board so as to form an
image on it of the right size.

You may need to darken the room, especially if the image you want is large.

  #10  
Old April 3rd 15, 07:13 PM posted to uk.d-i-y,uk.tech.digital-tv
michael adams[_4_]
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Posts: 12
Default projecting an image


"Norman Wells" wrote in message
...
"Bill Wright" wrote in message
...
I need to project or otherwise place an image on a wooden board so I can paint it on
the board by using it as a guide. I don't have an overhead projector. I have some
transparent media for a laser printer and I have a 60 year old 6cm projector in the
loft but I don't want to dig it out and the bulb will blow and the whole thing will be
annoying.

Isn't there some way the old painter guys used to do this, just with a mirror or
something?

Come on gentlemen and ladies, ideas?


You need a lens from an old 35mm single lens reflex camera. Mount it, eg in a hole
through another board, so you can securely position it where necessary between the
well-illuminated original and the target board so as to form an image on it of the
right size.

You may need to darken the room, especially if the image you want is large.


The resulting image would be upside down and reversed left-right.

That's where all the mirrors, prisms and all the rest of the
tricky stuff comes in.


michael adams

....




 




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