Scanning transparencies

[colcut]

Hi,

I'm sure the answer is here somewhere but I haven't found it yet . Can anyone help?

I want to scan a number of old transparencies for use on a laptop with MS Powerpoint. The images will be projected onto a large screen in the same way as the original transparencies were projected when I used a slide projector.

The question is at what resolution should I scan the slides in order to get maximum quality?

Also I have been told that the quality using digitized slides and Powerpoint will not be anything like the quality experienced when using a slide projector. Any views on this?

All contibutions grwill be gratefully received.

Regards,
Colin

[lordjim]

I am not an expert but 72 dpi should probably be enough for a Powerpoint presentation. That being said, to be on the safe side, you may want to increase this to 200 or 250 dpi although I would bet that you won't need that much details for a Powerpoint presentation.

[blue_max]

Hi,

I'm sure the answer is here somewhere but I haven't found it yet . Can anyone help?

I want to scan a number of old transparencies for use on a laptop with MS Powerpoint. The images will be projected onto a large screen in the same way as the original transparencies were projected when I used a slide projector.

The question is at what resolution should I scan the slides in order to get maximum quality?

Also I have been told that the quality using digitized slides and Powerpoint will not be anything like the quality experienced when using a slide projector. Any views on this?

All contibutions grwill be gratefully received.

Regards,
Colin

Scan at the maximum NATIVE resolution of your scanner. That is the highest resolution that it will allow before it tries to guestimate up the pixels. It is the raw data you want. You will not improve on that. If you need to increase it, do it in photoshop or similar.

A well sharpened image done digitally will hold it's own. A slide projector is not a high quality device, so you should be fine.

I have no experience of powerpoint or slide presentations, but that should start the ball rolling.

Graham

[lordjim]

72dpi for a powerpoint presentation should be enough. You can find a number of pages on the internet discussing this matter including here:

http://www.techwr-l.com/techwhirl/archives/9907/techwhirl-9907-00709.html

[Rick Baker]

If they are photos I would scan at the highest possible, just to have high resolution scans handy. Downsample to 72 dpi for Powerpoint or any screen display