Digital Projection Scanning Resolution

"ian" <ians_stuff DeleteThis @lycees.co.uk> wrote in message
news:ddsem7$bk7$1@canard.ulcc.ac.uk...
> "Michael" <m.sosopoulos DeleteThis @elfon.gr> wrote in message
> news:ddsbok$42k$1@usenet.otenet.gr...
> >I would like to know if there is an "optimum" resolution that
> >transparencies
> > and photos should be scanned, in order to use the files for digital
> > projection.
> >
> > Thank You
>
> What is the resolution of the projector?
>
>

I'm looking to buy one, that's why I'm asking that question. Is there a
relation between the projector resolution and the resolution of the scanned
transparency?
 >> Stay informed about: Digital Projection Scanning Resolution 

"Michael" <m.sosopoulos.DeleteThis@elfon.gr> wrote in message
news:ddsf1u$im2$1@usenet.otenet.gr...
>
> "ian" <ians_stuff.DeleteThis@lycees.co.uk> wrote in message
> news:ddsem7$bk7$1@canard.ulcc.ac.uk...
>> "Michael" <m.sosopoulos.DeleteThis@elfon.gr> wrote in message
>> news:ddsbok$42k$1@usenet.otenet.gr...
>> >I would like to know if there is an "optimum" resolution that
>> >transparencies
>> > and photos should be scanned, in order to use the files for digital
>> > projection.
>> >
>> > Thank You
>>
>> What is the resolution of the projector?
>>
>>
>
> I'm looking to buy one, that's why I'm asking that question. Is there a
> relation between the projector resolution and the resolution of the
> scanned
> transparency?

No.
If you have a decent photo-viewer program, it will render the image to
whatever your screen/projector res is set to.

To the contrary... when I show images on a digital projector, I find it
extemely useful to be able to instantly zoom in on portions of an image.
This is great for examining things closely--especially when viewing images
for discussion.

ACDSee from acdsystms has a great facility for this sort of zooming.
You simply drag a box around the portion you wish to see...click teh box,
and boing!
-It zooms that portion to full screen size.
**If you've only scanned at the screen resolution, then this zooming will do
nothing but look like pixelated garbage. But if you've scanned at high
resolution, you'll be amazed at what great detail you'll enjoy zooming in
on.

-Mark
 >> Stay informed about: Digital Projection Scanning Resolution 

Michael wrote:
> I would like to know if there is an "optimum" resolution that transparencies
> and photos should be scanned, in order to use the files for digital
> projection.
>
> Thank You
>
>
Other responses have pointed to the native resolution of the projector as a guide. You
should also keep in mind the purpose of projetcing the image. If it is for a talk, you
need to keep the amount of material in the image small enough to easily comprehend while
you are talking. You don't need a lot of resoluton ot meet thta objective; 1024 X 768
pixels works well for legible letters of a large enough size. If a picture has detail you
wnat to show, first display the whole image, then the detail separately.
 >> Stay informed about: Digital Projection Scanning Resolution 

Michael wrote:
> "ian" <ians_stuff.DeleteThis@lycees.co.uk> wrote in message
> news:ddsem7$bk7$1@canard.ulcc.ac.uk...
>> "Michael" <m.sosopoulos.DeleteThis@elfon.gr> wrote in message
>> news:ddsbok$42k$1@usenet.otenet.gr...
>>> I would like to know if there is an "optimum" resolution that
>>> transparencies
>>> and photos should be scanned, in order to use the files for digital
>>> projection.
>>>
>>> Thank You
>>
>> What is the resolution of the projector?
>>
>>
>
> I'm looking to buy one, that's why I'm asking that question. Is there
> a relation between the projector resolution and the resolution of the
> scanned transparency?

The best resolution is the native one for the projector as long as the
video output from the computer matches.

-Mike
 >> Stay informed about: Digital Projection Scanning Resolution 

Mike Warren wrote:
> Michael wrote:
>> "ian" <ians_stuff.RemoveThis@lycees.co.uk> wrote in message
>> news:ddsem7$bk7$1@canard.ulcc.ac.uk...
>>> "Michael" <m.sosopoulos.RemoveThis@elfon.gr> wrote in message
>>> news:ddsbok$42k$1@usenet.otenet.gr...
>>>> I would like to know if there is an "optimum" resolution that
>>>> transparencies
>>>> and photos should be scanned, in order to use the files for
>>>> digital projection.
>>>>
>>>> Thank You
>>>
>>> What is the resolution of the projector?
>>>
>>>
>>
>> I'm looking to buy one, that's why I'm asking that question. Is there
>> a relation between the projector resolution and the resolution of the
>> scanned transparency?
>
> The best resolution is the native one for the projector as long as the
> video output from the computer matches.

I should add: It's not the resolution (as in DPI) you need to worry about
but the actual size of the image files. eg: 800x600 or 1024x768 etc.

The cleanest picture is produced when no scaling needs to be done.

-Mike
 >> Stay informed about: Digital Projection Scanning Resolution 

"Mike Warren" <miwa-not-this-bit RemoveThis @or-this-cairnscarsound.com.au> wrote in
message news:4301cc80$0$82549$892e7fe2@authen.white.readfreenews.net...
> Mike Warren wrote:
>> Michael wrote:
>>> "ian" <ians_stuff RemoveThis @lycees.co.uk> wrote in message
>>> news:ddsem7$bk7$1@canard.ulcc.ac.uk...
>>>> "Michael" <m.sosopoulos RemoveThis @elfon.gr> wrote in message
>>>> news:ddsbok$42k$1@usenet.otenet.gr...
>>>>> I would like to know if there is an "optimum" resolution that
>>>>> transparencies
>>>>> and photos should be scanned, in order to use the files for
>>>>> digital projection.
>>>>>
>>>>> Thank You
>>>>
>>>> What is the resolution of the projector?
>>>>
>>>>
>>>
>>> I'm looking to buy one, that's why I'm asking that question. Is there
>>> a relation between the projector resolution and the resolution of the
>>> scanned transparency?
>>
>> The best resolution is the native one for the projector as long as the
>> video output from the computer matches.
>
> I should add: It's not the resolution (as in DPI) you need to worry about
> but the actual size of the image files. eg: 800x600 or 1024x768 etc.
>
> The cleanest picture is produced when no scaling needs to be done.

I do not agree with that, assuming you've got a photo viewer with good
algos.
The only time the image breaks down is when your computer is sending a
SCREEN resolution to the projector that is not the projector's native
resolution. This has nothing to do with the resolution of the actual image
file. See my other post in this thread outlining reasons to scan in high
resolution despite low res projectors.
 >> Stay informed about: Digital Projection Scanning Resolution 

Mark² wrote:
>> The cleanest picture is produced when no scaling needs to be done.
>
> I do not agree with that, assuming you've got a photo viewer with good
> algos.
> The only time the image breaks down is when your computer is sending a
> SCREEN resolution to the projector that is not the projector's native
> resolution. This has nothing to do with the resolution of the actual
> image file. See my other post in this thread outlining reasons to
> scan in high resolution despite low res projectors.

Yes, as long as the software does bicubic scaling and the computer
is fast enough not to cause anoying delays.

-Mike
 >> Stay informed about: Digital Projection Scanning Resolution 

"Mike Warren" <miwa-not-this-bit.DeleteThis@or-this-cairnscarsound.com.au> wrote in
message news:4301dd1a$0$47203$892e7fe2@authen.white.readfreenews.net...
> Mark² wrote:
>>> The cleanest picture is produced when no scaling needs to be done.
>>
>> I do not agree with that, assuming you've got a photo viewer with good
>> algos.
>> The only time the image breaks down is when your computer is sending a
>> SCREEN resolution to the projector that is not the projector's native
>> resolution. This has nothing to do with the resolution of the actual
>> image file. See my other post in this thread outlining reasons to
>> scan in high resolution despite low res projectors.
>
> Yes, as long as the software does bicubic scaling and the computer
> is fast enough not to cause anoying delays.

Any computer less than 3 or 4 years old should have no problem with that.

Older ones will probably do fine too, since the projector requires such low
res native input.
The real key is simply having a decent viewer program.
I highly recommend ACDSee (www.acdsystems.com)
They have a free, fully functional demo version...
Others will recommend the fully free viewers like IrfanView. I don't care
for it, but many do.
 >> Stay informed about: Digital Projection Scanning Resolution